Articles | Volume 17, issue 2
https://doi.org/10.5194/cp-17-753-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-17-753-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
06 Apr 2021
Research article |
| 06 Apr 2021
| 06 Apr 2021
Evaluating the biological pump efficiency of the Last Glacial Maximum ocean using δ13C
Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, 5007, Norway
Jörg Schwinger
NORCE Norwegian Research Centre and Bjerknes Centre for Climate Research, Bergen, 5838, Norway
Ulysses S. Ninnemann
Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Bergen, 5007, Norway
Aurich Jeltsch-Thömmes
Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
Ingo Bethke
Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, 5007, Norway
Christoph Heinze
Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, 5007, Norway
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Anne L. Morée, Fabrice Lacroix, William W. L. Cheung, and Thomas L. Frölicher
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Using novel Earth system model simulations and applying the Aerobic Growth Index, we show that only about half of the habitat loss for marine species is realized when temperature stabilization is initially reached. The maximum habitat loss happens over a century after peak warming in a temperature overshoot scenario peaking at 2 °C before stabilizing at 1.5 °C. We also emphasize that species adaptation may be key in mitigating the long-term impacts of temperature stabilization and overshoot.
Christoph Heinze, Thorsten Blenckner, Peter Brown, Friederike Fröb, Anne Morée, Adrian L. New, Cara Nissen, Stefanie Rynders, Isabel Seguro, Yevgeny Aksenov, Yuri Artioli, Timothée Bourgeois, Friedrich Burger, Jonathan Buzan, B. B. Cael, Veli Çağlar Yumruktepe, Melissa Chierici, Christopher Danek, Ulf Dieckmann, Agneta Fransson, Thomas Frölicher, Giovanni Galli, Marion Gehlen, Aridane G. González, Melchor Gonzalez-Davila, Nicolas Gruber, Örjan Gustafsson, Judith Hauck, Mikko Heino, Stephanie Henson, Jenny Hieronymus, I. Emma Huertas, Fatma Jebri, Aurich Jeltsch-Thömmes, Fortunat Joos, Jaideep Joshi, Stephen Kelly, Nandini Menon, Precious Mongwe, Laurent Oziel, Sólveig Ólafsdottir, Julien Palmieri, Fiz F. Pérez, Rajamohanan Pillai Ranith, Juliano Ramanantsoa, Tilla Roy, Dagmara Rusiecka, J. Magdalena Santana Casiano, Yeray Santana-Falcón, Jörg Schwinger, Roland Séférian, Miriam Seifert, Anna Shchiptsova, Bablu Sinha, Christopher Somes, Reiner Steinfeldt, Dandan Tao, Jerry Tjiputra, Adam Ulfsbo, Christoph Völker, Tsuyoshi Wakamatsu, and Ying Ye
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-182, https://doi.org/10.5194/bg-2023-182, 2023
Revised manuscript not accepted
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Biogeosciences, 20, 2425–2454, https://doi.org/10.5194/bg-20-2425-2023, https://doi.org/10.5194/bg-20-2425-2023, 2023
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Ocean temperature and oxygen shape marine habitats together with species’ characteristics. We calculated the impacts of projected 21st-century warming and oxygen loss on the contemporary habitat volume of 47 marine species and described the drivers of these impacts. Most species lose less than 5 % of their habitat at 2 °C of global warming, but some species incur losses 2–3 times greater than that. We also calculate which species may be most vulnerable to climate change and why this is the case.
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Geosci. Model Dev., 18, 5451–5465, https://doi.org/10.5194/gmd-18-5451-2025, https://doi.org/10.5194/gmd-18-5451-2025, 2025
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Brendan R. Carter, Jörg Schwinger, Rolf Sonnerup, Andrea J. Fassbender, Jonathan D. Sharp, Larissa M. Dias, and Daniel E. Sandborn
Earth Syst. Sci. Data, 17, 3073–3088, https://doi.org/10.5194/essd-17-3073-2025, https://doi.org/10.5194/essd-17-3073-2025, 2025
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The boron isotopic composition (δ11B) of foraminifera shells is an established proxy for the reconstruction of ocean pH. Applications to the Arctic oceans are however limited as robust calibrations in these regions are lacking. Here, we present a new calibration linking δ11B measured in two high-latitude foraminifera species to seawater pH. We show that the δ11B of the species analysed is well correlated with seawater pH and that this calibration can be applied to the paleorecord.
Pierre Friedlingstein, Michael O'Sullivan, Matthew W. Jones, Robbie M. Andrew, Judith Hauck, Peter Landschützer, Corinne Le Quéré, Hongmei Li, Ingrid T. Luijkx, Are Olsen, Glen P. Peters, Wouter Peters, Julia Pongratz, Clemens Schwingshackl, Stephen Sitch, Josep G. Canadell, Philippe Ciais, Robert B. Jackson, Simone R. Alin, Almut Arneth, Vivek Arora, Nicholas R. Bates, Meike Becker, Nicolas Bellouin, Carla F. Berghoff, Henry C. Bittig, Laurent Bopp, Patricia Cadule, Katie Campbell, Matthew A. Chamberlain, Naveen Chandra, Frédéric Chevallier, Louise P. Chini, Thomas Colligan, Jeanne Decayeux, Laique M. Djeutchouang, Xinyu Dou, Carolina Duran Rojas, Kazutaka Enyo, Wiley Evans, Amanda R. Fay, Richard A. Feely, Daniel J. Ford, Adrianna Foster, Thomas Gasser, Marion Gehlen, Thanos Gkritzalis, Giacomo Grassi, Luke Gregor, Nicolas Gruber, Özgür Gürses, Ian Harris, Matthew Hefner, Jens Heinke, George C. Hurtt, Yosuke Iida, Tatiana Ilyina, Andrew R. Jacobson, Atul K. Jain, Tereza Jarníková, Annika Jersild, Fei Jiang, Zhe Jin, Etsushi Kato, Ralph F. Keeling, Kees Klein Goldewijk, Jürgen Knauer, Jan Ivar Korsbakken, Xin Lan, Siv K. Lauvset, Nathalie Lefèvre, Zhu Liu, Junjie Liu, Lei Ma, Shamil Maksyutov, Gregg Marland, Nicolas Mayot, Patrick C. McGuire, Nicolas Metzl, Natalie M. Monacci, Eric J. Morgan, Shin-Ichiro Nakaoka, Craig Neill, Yosuke Niwa, Tobias Nützel, Lea Olivier, Tsuneo Ono, Paul I. Palmer, Denis Pierrot, Zhangcai Qin, Laure Resplandy, Alizée Roobaert, Thais M. Rosan, Christian Rödenbeck, Jörg Schwinger, T. Luke Smallman, Stephen M. Smith, Reinel Sospedra-Alfonso, Tobias Steinhoff, Qing Sun, Adrienne J. Sutton, Roland Séférian, Shintaro Takao, Hiroaki Tatebe, Hanqin Tian, Bronte Tilbrook, Olivier Torres, Etienne Tourigny, Hiroyuki Tsujino, Francesco Tubiello, Guido van der Werf, Rik Wanninkhof, Xuhui Wang, Dongxu Yang, Xiaojuan Yang, Zhen Yu, Wenping Yuan, Xu Yue, Sönke Zaehle, Ning Zeng, and Jiye Zeng
Earth Syst. Sci. Data, 17, 965–1039, https://doi.org/10.5194/essd-17-965-2025, https://doi.org/10.5194/essd-17-965-2025, 2025
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We simulated how different processes affected the carbon cycle over the last eight glacial cycles. We found that the effects of interactive marine sediments enlarge the carbon fluxes that result from these processes, especially in the ocean, and alter various proxy signals. We provide an assessment of the directions of regional and global proxy changes that might be expected in response to different glacial–interglacial Earth system changes in the presence of interactive marine sediments.
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Fang Li, Xiang Song, Sandy P. Harrison, Jennifer R. Marlon, Zhongda Lin, L. Ruby Leung, Jörg Schwinger, Virginie Marécal, Shiyu Wang, Daniel S. Ward, Xiao Dong, Hanna Lee, Lars Nieradzik, Sam S. Rabin, and Roland Séférian
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Timothée Bourgeois, Olivier Torres, Friederike Fröb, Aurich Jeltsch-Thömmes, Giang T. Tran, Jörg Schwinger, Thomas L. Frölicher, Jean Negrel, David Keller, Andreas Oschlies, Laurent Bopp, and Fortunat Joos
EGUsphere, https://doi.org/10.5194/egusphere-2024-2768, https://doi.org/10.5194/egusphere-2024-2768, 2024
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Anthropogenic greenhouse gas emissions significantly impact ocean ecosystems through climate change and acidification, leading to either progressive or abrupt changes. This study maps the crossing of physical and ecological limits for various ocean impact metrics under three emission scenarios. Using Earth system models, we identify when these limits are exceeded, highlighting the urgent need for ambitious climate action to safeguard the world's oceans and ecosystems.
Nil Irvalı, Ulysses S. Ninnemann, Are Olsen, Neil L. Rose, David J. R. Thornalley, Tor L. Mjell, and François Counillon
Geochronology, 6, 449–463, https://doi.org/10.5194/gchron-6-449-2024, https://doi.org/10.5194/gchron-6-449-2024, 2024
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Marine sediments are excellent archives for reconstructing past changes in climate and ocean circulation. Yet, dating uncertainties, particularly during the 20th century, pose major challenges. Here we propose a novel chronostratigraphic approach that uses anthropogenic signals, such as the oceanic 13C Suess effect and spheroidal carbonaceous fly-ash particles, to reduce age model uncertainties in high-resolution marine archives over the 20th century.
Hanqin Tian, Naiqing Pan, Rona L. Thompson, Josep G. Canadell, Parvadha Suntharalingam, Pierre Regnier, Eric A. Davidson, Michael Prather, Philippe Ciais, Marilena Muntean, Shufen Pan, Wilfried Winiwarter, Sönke Zaehle, Feng Zhou, Robert B. Jackson, Hermann W. Bange, Sarah Berthet, Zihao Bian, Daniele Bianchi, Alexander F. Bouwman, Erik T. Buitenhuis, Geoffrey Dutton, Minpeng Hu, Akihiko Ito, Atul K. Jain, Aurich Jeltsch-Thömmes, Fortunat Joos, Sian Kou-Giesbrecht, Paul B. Krummel, Xin Lan, Angela Landolfi, Ronny Lauerwald, Ya Li, Chaoqun Lu, Taylor Maavara, Manfredi Manizza, Dylan B. Millet, Jens Mühle, Prabir K. Patra, Glen P. Peters, Xiaoyu Qin, Peter Raymond, Laure Resplandy, Judith A. Rosentreter, Hao Shi, Qing Sun, Daniele Tonina, Francesco N. Tubiello, Guido R. van der Werf, Nicolas Vuichard, Junjie Wang, Kelley C. Wells, Luke M. Western, Chris Wilson, Jia Yang, Yuanzhi Yao, Yongfa You, and Qing Zhu
Earth Syst. Sci. Data, 16, 2543–2604, https://doi.org/10.5194/essd-16-2543-2024, https://doi.org/10.5194/essd-16-2543-2024, 2024
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Markus Adloff, Frerk Pöppelmeier, Aurich Jeltsch-Thömmes, Thomas F. Stocker, and Fortunat Joos
Clim. Past, 20, 1233–1250, https://doi.org/10.5194/cp-20-1233-2024, https://doi.org/10.5194/cp-20-1233-2024, 2024
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The Atlantic Meridional Overturning Circulation (AMOC) is an ocean current that transports heat into the North Atlantic. Over the ice age cycles, AMOC strength and its spatial pattern varied. We tested the role of heat forcing for these AMOC changes by simulating the temperature changes of the last eight glacial cycles. In our model, AMOC shifts between four distinct circulation modes caused by heat and salt redistributions that reproduce reconstructed long-term North Atlantic SST changes.
Jenny Hieronymus, Magnus Hieronymus, Matthias Gröger, Jörg Schwinger, Raffaele Bernadello, Etienne Tourigny, Valentina Sicardi, Itzel Ruvalcaba Baroni, and Klaus Wyser
Biogeosciences, 21, 2189–2206, https://doi.org/10.5194/bg-21-2189-2024, https://doi.org/10.5194/bg-21-2189-2024, 2024
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The timing of the net primary production annual maxima in the North Atlantic in the period 1750–2100 is investigated using two Earth system models and the high-emissions scenario SSP5-8.5. It is found that, for most of the region, the annual maxima occur progressively earlier, with the most change occurring after the year 2000. Shifts in the seasonality of the primary production may impact the entire ecosystem, which highlights the need for long-term monitoring campaigns in this area.
Ali Asaadi, Jörg Schwinger, Hanna Lee, Jerry Tjiputra, Vivek Arora, Roland Séférian, Spencer Liddicoat, Tomohiro Hajima, Yeray Santana-Falcón, and Chris D. Jones
Biogeosciences, 21, 411–435, https://doi.org/10.5194/bg-21-411-2024, https://doi.org/10.5194/bg-21-411-2024, 2024
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Carbon cycle feedback metrics are employed to assess phases of positive and negative CO2 emissions. When emissions become negative, we find that the model disagreement in feedback metrics increases more strongly than expected from the assumption that the uncertainties accumulate linearly with time. The geographical patterns of such metrics over land highlight that differences in response between tropical/subtropical and temperate/boreal ecosystems are a major source of model disagreement.
Michelle J. Curran, Christophe Colin, Megan Murphy O’Connor, Ulysses S. Ninnemann, and Audrey Morley
Clim. Past Discuss., https://doi.org/10.5194/cp-2023-101, https://doi.org/10.5194/cp-2023-101, 2024
Revised manuscript not accepted
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Our multi-proxy examination of an abrupt climate event during peak MIS11 reveals new evidence that the reorganisation of Polar and Atlantic Waters at subpolar latitudes is central mechanistically for the stability of North Atlantic Deep Water formation. We conclude that high-magnitude AMOC variability is possible without the addition of freshwater or Icebergs to deep water formation regions challenging established knowledge of AMOC sensitivity and stability during warm climates.
Pierre Friedlingstein, Michael O'Sullivan, Matthew W. Jones, Robbie M. Andrew, Dorothee C. E. Bakker, Judith Hauck, Peter Landschützer, Corinne Le Quéré, Ingrid T. Luijkx, Glen P. Peters, Wouter Peters, Julia Pongratz, Clemens Schwingshackl, Stephen Sitch, Josep G. Canadell, Philippe Ciais, Robert B. Jackson, Simone R. Alin, Peter Anthoni, Leticia Barbero, Nicholas R. Bates, Meike Becker, Nicolas Bellouin, Bertrand Decharme, Laurent Bopp, Ida Bagus Mandhara Brasika, Patricia Cadule, Matthew A. Chamberlain, Naveen Chandra, Thi-Tuyet-Trang Chau, Frédéric Chevallier, Louise P. Chini, Margot Cronin, Xinyu Dou, Kazutaka Enyo, Wiley Evans, Stefanie Falk, Richard A. Feely, Liang Feng, Daniel J. Ford, Thomas Gasser, Josefine Ghattas, Thanos Gkritzalis, Giacomo Grassi, Luke Gregor, Nicolas Gruber, Özgür Gürses, Ian Harris, Matthew Hefner, Jens Heinke, Richard A. Houghton, George C. Hurtt, Yosuke Iida, Tatiana Ilyina, Andrew R. Jacobson, Atul Jain, Tereza Jarníková, Annika Jersild, Fei Jiang, Zhe Jin, Fortunat Joos, Etsushi Kato, Ralph F. Keeling, Daniel Kennedy, Kees Klein Goldewijk, Jürgen Knauer, Jan Ivar Korsbakken, Arne Körtzinger, Xin Lan, Nathalie Lefèvre, Hongmei Li, Junjie Liu, Zhiqiang Liu, Lei Ma, Greg Marland, Nicolas Mayot, Patrick C. McGuire, Galen A. McKinley, Gesa Meyer, Eric J. Morgan, David R. Munro, Shin-Ichiro Nakaoka, Yosuke Niwa, Kevin M. O'Brien, Are Olsen, Abdirahman M. Omar, Tsuneo Ono, Melf Paulsen, Denis Pierrot, Katie Pocock, Benjamin Poulter, Carter M. Powis, Gregor Rehder, Laure Resplandy, Eddy Robertson, Christian Rödenbeck, Thais M. Rosan, Jörg Schwinger, Roland Séférian, T. Luke Smallman, Stephen M. Smith, Reinel Sospedra-Alfonso, Qing Sun, Adrienne J. Sutton, Colm Sweeney, Shintaro Takao, Pieter P. Tans, Hanqin Tian, Bronte Tilbrook, Hiroyuki Tsujino, Francesco Tubiello, Guido R. van der Werf, Erik van Ooijen, Rik Wanninkhof, Michio Watanabe, Cathy Wimart-Rousseau, Dongxu Yang, Xiaojuan Yang, Wenping Yuan, Xu Yue, Sönke Zaehle, Jiye Zeng, and Bo Zheng
Earth Syst. Sci. Data, 15, 5301–5369, https://doi.org/10.5194/essd-15-5301-2023, https://doi.org/10.5194/essd-15-5301-2023, 2023
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The Global Carbon Budget 2023 describes the methodology, main results, and data sets used to quantify the anthropogenic emissions of carbon dioxide (CO2) and their partitioning among the atmosphere, land ecosystems, and the ocean over the historical period (1750–2023). These living datasets are updated every year to provide the highest transparency and traceability in the reporting of CO2, the key driver of climate change.
Luke Skinner, Francois Primeau, Aurich Jeltsch-Thömmes, Fortunat Joos, Peter Köhler, and Edouard Bard
Clim. Past, 19, 2177–2202, https://doi.org/10.5194/cp-19-2177-2023, https://doi.org/10.5194/cp-19-2177-2023, 2023
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Radiocarbon is best known as a dating tool, but it also allows us to track CO2 exchange between the ocean and atmosphere. Using decades of data and novel mapping methods, we have charted the ocean’s average radiocarbon ″age” since the last Ice Age. Combined with climate model simulations, these data quantify the ocean’s role in atmospheric CO2 rise since the last Ice Age while also revealing that Earth likely received far more cosmic radiation during the last Ice Age than hitherto believed.
Christoph Heinze, Thorsten Blenckner, Peter Brown, Friederike Fröb, Anne Morée, Adrian L. New, Cara Nissen, Stefanie Rynders, Isabel Seguro, Yevgeny Aksenov, Yuri Artioli, Timothée Bourgeois, Friedrich Burger, Jonathan Buzan, B. B. Cael, Veli Çağlar Yumruktepe, Melissa Chierici, Christopher Danek, Ulf Dieckmann, Agneta Fransson, Thomas Frölicher, Giovanni Galli, Marion Gehlen, Aridane G. González, Melchor Gonzalez-Davila, Nicolas Gruber, Örjan Gustafsson, Judith Hauck, Mikko Heino, Stephanie Henson, Jenny Hieronymus, I. Emma Huertas, Fatma Jebri, Aurich Jeltsch-Thömmes, Fortunat Joos, Jaideep Joshi, Stephen Kelly, Nandini Menon, Precious Mongwe, Laurent Oziel, Sólveig Ólafsdottir, Julien Palmieri, Fiz F. Pérez, Rajamohanan Pillai Ranith, Juliano Ramanantsoa, Tilla Roy, Dagmara Rusiecka, J. Magdalena Santana Casiano, Yeray Santana-Falcón, Jörg Schwinger, Roland Séférian, Miriam Seifert, Anna Shchiptsova, Bablu Sinha, Christopher Somes, Reiner Steinfeldt, Dandan Tao, Jerry Tjiputra, Adam Ulfsbo, Christoph Völker, Tsuyoshi Wakamatsu, and Ying Ye
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-182, https://doi.org/10.5194/bg-2023-182, 2023
Revised manuscript not accepted
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For assessing the consequences of human-induced climate change for the marine realm, it is necessary to not only look at gradual changes but also at abrupt changes of environmental conditions. We summarise abrupt changes in ocean warming, acidification, and oxygen concentration as the key environmental factors for ecosystems. Taking these abrupt changes into account requires greenhouse gas emissions to be reduced to a larger extent than previously thought to limit respective damage.
Anne L. Morée, Tayler M. Clarke, William W. L. Cheung, and Thomas L. Frölicher
Biogeosciences, 20, 2425–2454, https://doi.org/10.5194/bg-20-2425-2023, https://doi.org/10.5194/bg-20-2425-2023, 2023
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Ocean temperature and oxygen shape marine habitats together with species’ characteristics. We calculated the impacts of projected 21st-century warming and oxygen loss on the contemporary habitat volume of 47 marine species and described the drivers of these impacts. Most species lose less than 5 % of their habitat at 2 °C of global warming, but some species incur losses 2–3 times greater than that. We also calculate which species may be most vulnerable to climate change and why this is the case.
Matteo Willeit, Tatiana Ilyina, Bo Liu, Christoph Heinze, Mahé Perrette, Malte Heinemann, Daniela Dalmonech, Victor Brovkin, Guy Munhoven, Janine Börker, Jens Hartmann, Gibran Romero-Mujalli, and Andrey Ganopolski
Geosci. Model Dev., 16, 3501–3534, https://doi.org/10.5194/gmd-16-3501-2023, https://doi.org/10.5194/gmd-16-3501-2023, 2023
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In this paper we present the carbon cycle component of the newly developed fast Earth system model CLIMBER-X. The model can be run with interactive atmospheric CO2 to investigate the feedbacks between climate and the carbon cycle on temporal scales ranging from decades to > 100 000 years. CLIMBER-X is expected to be a useful tool for studying past climate–carbon cycle changes and for the investigation of the long-term future evolution of the Earth system.
Alban Planchat, Lester Kwiatkowski, Laurent Bopp, Olivier Torres, James R. Christian, Momme Butenschön, Tomas Lovato, Roland Séférian, Matthew A. Chamberlain, Olivier Aumont, Michio Watanabe, Akitomo Yamamoto, Andrew Yool, Tatiana Ilyina, Hiroyuki Tsujino, Kristen M. Krumhardt, Jörg Schwinger, Jerry Tjiputra, John P. Dunne, and Charles Stock
Biogeosciences, 20, 1195–1257, https://doi.org/10.5194/bg-20-1195-2023, https://doi.org/10.5194/bg-20-1195-2023, 2023
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Ocean alkalinity is critical to the uptake of atmospheric carbon and acidification in surface waters. We review the representation of alkalinity and the associated calcium carbonate cycle in Earth system models. While many parameterizations remain present in the latest generation of models, there is a general improvement in the simulated alkalinity distribution. This improvement is related to an increase in the export of biotic calcium carbonate, which closer resembles observations.
Shuang Gao, Jörg Schwinger, Jerry Tjiputra, Ingo Bethke, Jens Hartmann, Emilio Mayorga, and Christoph Heinze
Biogeosciences, 20, 93–119, https://doi.org/10.5194/bg-20-93-2023, https://doi.org/10.5194/bg-20-93-2023, 2023
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We assess the impact of riverine nutrients and carbon (C) on projected marine primary production (PP) and C uptake using a fully coupled Earth system model. Riverine inputs alleviate nutrient limitation and thus lessen the projected PP decline by up to 0.7 Pg C yr−1 globally. The effect of increased riverine C may be larger than the effect of nutrient inputs in the future on the projected ocean C uptake, while in the historical period increased nutrient inputs are considered the largest driver.
Jörg Schwinger, Ali Asaadi, Norman Julius Steinert, and Hanna Lee
Earth Syst. Dynam., 13, 1641–1665, https://doi.org/10.5194/esd-13-1641-2022, https://doi.org/10.5194/esd-13-1641-2022, 2022
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We test whether climate change can be partially reversed if CO2 is removed from the atmosphere to compensate for too large past and near-term emissions by using idealized model simulations of overshoot pathways. On a timescale of 100 years, we find a high degree of reversibility if the overshoot size remains small, and we do not find tipping points even for intense overshoots. We caution that current Earth system models are most likely not able to skilfully model tipping points in ecosystems.
Pierre Friedlingstein, Michael O'Sullivan, Matthew W. Jones, Robbie M. Andrew, Luke Gregor, Judith Hauck, Corinne Le Quéré, Ingrid T. Luijkx, Are Olsen, Glen P. Peters, Wouter Peters, Julia Pongratz, Clemens Schwingshackl, Stephen Sitch, Josep G. Canadell, Philippe Ciais, Robert B. Jackson, Simone R. Alin, Ramdane Alkama, Almut Arneth, Vivek K. Arora, Nicholas R. Bates, Meike Becker, Nicolas Bellouin, Henry C. Bittig, Laurent Bopp, Frédéric Chevallier, Louise P. Chini, Margot Cronin, Wiley Evans, Stefanie Falk, Richard A. Feely, Thomas Gasser, Marion Gehlen, Thanos Gkritzalis, Lucas Gloege, Giacomo Grassi, Nicolas Gruber, Özgür Gürses, Ian Harris, Matthew Hefner, Richard A. Houghton, George C. Hurtt, Yosuke Iida, Tatiana Ilyina, Atul K. Jain, Annika Jersild, Koji Kadono, Etsushi Kato, Daniel Kennedy, Kees Klein Goldewijk, Jürgen Knauer, Jan Ivar Korsbakken, Peter Landschützer, Nathalie Lefèvre, Keith Lindsay, Junjie Liu, Zhu Liu, Gregg Marland, Nicolas Mayot, Matthew J. McGrath, Nicolas Metzl, Natalie M. Monacci, David R. Munro, Shin-Ichiro Nakaoka, Yosuke Niwa, Kevin O'Brien, Tsuneo Ono, Paul I. Palmer, Naiqing Pan, Denis Pierrot, Katie Pocock, Benjamin Poulter, Laure Resplandy, Eddy Robertson, Christian Rödenbeck, Carmen Rodriguez, Thais M. Rosan, Jörg Schwinger, Roland Séférian, Jamie D. Shutler, Ingunn Skjelvan, Tobias Steinhoff, Qing Sun, Adrienne J. Sutton, Colm Sweeney, Shintaro Takao, Toste Tanhua, Pieter P. Tans, Xiangjun Tian, Hanqin Tian, Bronte Tilbrook, Hiroyuki Tsujino, Francesco Tubiello, Guido R. van der Werf, Anthony P. Walker, Rik Wanninkhof, Chris Whitehead, Anna Willstrand Wranne, Rebecca Wright, Wenping Yuan, Chao Yue, Xu Yue, Sönke Zaehle, Jiye Zeng, and Bo Zheng
Earth Syst. Sci. Data, 14, 4811–4900, https://doi.org/10.5194/essd-14-4811-2022, https://doi.org/10.5194/essd-14-4811-2022, 2022
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The Global Carbon Budget 2022 describes the datasets and methodology used to quantify the anthropogenic emissions of carbon dioxide (CO2) and their partitioning among the atmosphere, the land ecosystems, and the ocean. These living datasets are updated every year to provide the highest transparency and traceability in the reporting of CO2, the key driver of climate change.
Pierre Friedlingstein, Matthew W. Jones, Michael O'Sullivan, Robbie M. Andrew, Dorothee C. E. Bakker, Judith Hauck, Corinne Le Quéré, Glen P. Peters, Wouter Peters, Julia Pongratz, Stephen Sitch, Josep G. Canadell, Philippe Ciais, Rob B. Jackson, Simone R. Alin, Peter Anthoni, Nicholas R. Bates, Meike Becker, Nicolas Bellouin, Laurent Bopp, Thi Tuyet Trang Chau, Frédéric Chevallier, Louise P. Chini, Margot Cronin, Kim I. Currie, Bertrand Decharme, Laique M. Djeutchouang, Xinyu Dou, Wiley Evans, Richard A. Feely, Liang Feng, Thomas Gasser, Dennis Gilfillan, Thanos Gkritzalis, Giacomo Grassi, Luke Gregor, Nicolas Gruber, Özgür Gürses, Ian Harris, Richard A. Houghton, George C. Hurtt, Yosuke Iida, Tatiana Ilyina, Ingrid T. Luijkx, Atul Jain, Steve D. Jones, Etsushi Kato, Daniel Kennedy, Kees Klein Goldewijk, Jürgen Knauer, Jan Ivar Korsbakken, Arne Körtzinger, Peter Landschützer, Siv K. Lauvset, Nathalie Lefèvre, Sebastian Lienert, Junjie Liu, Gregg Marland, Patrick C. McGuire, Joe R. Melton, David R. Munro, Julia E. M. S. Nabel, Shin-Ichiro Nakaoka, Yosuke Niwa, Tsuneo Ono, Denis Pierrot, Benjamin Poulter, Gregor Rehder, Laure Resplandy, Eddy Robertson, Christian Rödenbeck, Thais M. Rosan, Jörg Schwinger, Clemens Schwingshackl, Roland Séférian, Adrienne J. Sutton, Colm Sweeney, Toste Tanhua, Pieter P. Tans, Hanqin Tian, Bronte Tilbrook, Francesco Tubiello, Guido R. van der Werf, Nicolas Vuichard, Chisato Wada, Rik Wanninkhof, Andrew J. Watson, David Willis, Andrew J. Wiltshire, Wenping Yuan, Chao Yue, Xu Yue, Sönke Zaehle, and Jiye Zeng
Earth Syst. Sci. Data, 14, 1917–2005, https://doi.org/10.5194/essd-14-1917-2022, https://doi.org/10.5194/essd-14-1917-2022, 2022
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The Global Carbon Budget 2021 describes the data sets and methodology used to quantify the emissions of carbon dioxide and their partitioning among the atmosphere, land, and ocean. These living data are updated every year to provide the highest transparency and traceability in the reporting of CO2, the key driver of climate change.
Ingo Bethke, Yiguo Wang, François Counillon, Noel Keenlyside, Madlen Kimmritz, Filippa Fransner, Annette Samuelsen, Helene Langehaug, Lea Svendsen, Ping-Gin Chiu, Leilane Passos, Mats Bentsen, Chuncheng Guo, Alok Gupta, Jerry Tjiputra, Alf Kirkevåg, Dirk Olivié, Øyvind Seland, Julie Solsvik Vågane, Yuanchao Fan, and Tor Eldevik
Geosci. Model Dev., 14, 7073–7116, https://doi.org/10.5194/gmd-14-7073-2021, https://doi.org/10.5194/gmd-14-7073-2021, 2021
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The Norwegian Climate Prediction Model version 1 (NorCPM1) is a new research tool for performing climate reanalyses and seasonal-to-decadal climate predictions. It adds data assimilation capability to the Norwegian Earth System Model version 1 (NorESM1) and has contributed output to the Decadal Climate Prediction Project (DCPP) as part of the sixth Coupled Model Intercomparison Project (CMIP6). We describe the system and evaluate its baseline, reanalysis and prediction performance.
Josué Bock, Martine Michou, Pierre Nabat, Manabu Abe, Jane P. Mulcahy, Dirk J. L. Olivié, Jörg Schwinger, Parvadha Suntharalingam, Jerry Tjiputra, Marco van Hulten, Michio Watanabe, Andrew Yool, and Roland Séférian
Biogeosciences, 18, 3823–3860, https://doi.org/10.5194/bg-18-3823-2021, https://doi.org/10.5194/bg-18-3823-2021, 2021
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In this study we analyse surface ocean dimethylsulfide (DMS) concentration and flux to the atmosphere from four CMIP6 Earth system models over the historical and ssp585 simulations.
Our analysis of contemporary (1980–2009) climatologies shows that models better reproduce observations in mid to high latitudes. The models disagree on the sign of the trend of the global DMS flux from 1980 onwards. The models agree on a positive trend of DMS over polar latitudes following sea-ice retreat dynamics.
Hanna Lee, Helene Muri, Altug Ekici, Jerry Tjiputra, and Jörg Schwinger
Earth Syst. Dynam., 12, 313–326, https://doi.org/10.5194/esd-12-313-2021, https://doi.org/10.5194/esd-12-313-2021, 2021
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We assess how three different geoengineering methods using aerosol affect land ecosystem carbon storage. Changes in temperature and precipitation play a large role in vegetation carbon uptake and storage, but our results show that increased levels of CO2 also play a considerable role. We show that there are unforeseen regional consequences under geoengineering applications, and these consequences should be taken into account in future climate policies before implementing them.
Frerk Pöppelmeier, Jeemijn Scheen, Aurich Jeltsch-Thömmes, and Thomas F. Stocker
Clim. Past, 17, 615–632, https://doi.org/10.5194/cp-17-615-2021, https://doi.org/10.5194/cp-17-615-2021, 2021
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The stability of the Atlantic Meridional Overturning Circulation (AMOC) critically depends on its mean state. We simulate the response of the AMOC to North Atlantic freshwater perturbations under different glacial boundary conditions. We find that a closed Bering Strait greatly increases the AMOC's sensitivity to freshwater hosing. Further, the shift from mono- to bistability strongly depends on the chosen boundary conditions, with weaker circulation states exhibiting more abrupt transitions.
Pierre Friedlingstein, Michael O'Sullivan, Matthew W. Jones, Robbie M. Andrew, Judith Hauck, Are Olsen, Glen P. Peters, Wouter Peters, Julia Pongratz, Stephen Sitch, Corinne Le Quéré, Josep G. Canadell, Philippe Ciais, Robert B. Jackson, Simone Alin, Luiz E. O. C. Aragão, Almut Arneth, Vivek Arora, Nicholas R. Bates, Meike Becker, Alice Benoit-Cattin, Henry C. Bittig, Laurent Bopp, Selma Bultan, Naveen Chandra, Frédéric Chevallier, Louise P. Chini, Wiley Evans, Liesbeth Florentie, Piers M. Forster, Thomas Gasser, Marion Gehlen, Dennis Gilfillan, Thanos Gkritzalis, Luke Gregor, Nicolas Gruber, Ian Harris, Kerstin Hartung, Vanessa Haverd, Richard A. Houghton, Tatiana Ilyina, Atul K. Jain, Emilie Joetzjer, Koji Kadono, Etsushi Kato, Vassilis Kitidis, Jan Ivar Korsbakken, Peter Landschützer, Nathalie Lefèvre, Andrew Lenton, Sebastian Lienert, Zhu Liu, Danica Lombardozzi, Gregg Marland, Nicolas Metzl, David R. Munro, Julia E. M. S. Nabel, Shin-Ichiro Nakaoka, Yosuke Niwa, Kevin O'Brien, Tsuneo Ono, Paul I. Palmer, Denis Pierrot, Benjamin Poulter, Laure Resplandy, Eddy Robertson, Christian Rödenbeck, Jörg Schwinger, Roland Séférian, Ingunn Skjelvan, Adam J. P. Smith, Adrienne J. Sutton, Toste Tanhua, Pieter P. Tans, Hanqin Tian, Bronte Tilbrook, Guido van der Werf, Nicolas Vuichard, Anthony P. Walker, Rik Wanninkhof, Andrew J. Watson, David Willis, Andrew J. Wiltshire, Wenping Yuan, Xu Yue, and Sönke Zaehle
Earth Syst. Sci. Data, 12, 3269–3340, https://doi.org/10.5194/essd-12-3269-2020, https://doi.org/10.5194/essd-12-3269-2020, 2020
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The Global Carbon Budget 2020 describes the data sets and methodology used to quantify the emissions of carbon dioxide and their partitioning among the atmosphere, land, and ocean. These living data are updated every year to provide the highest transparency and traceability in the reporting of CO2, the key driver of climate change.
Øyvind Seland, Mats Bentsen, Dirk Olivié, Thomas Toniazzo, Ada Gjermundsen, Lise Seland Graff, Jens Boldingh Debernard, Alok Kumar Gupta, Yan-Chun He, Alf Kirkevåg, Jörg Schwinger, Jerry Tjiputra, Kjetil Schanke Aas, Ingo Bethke, Yuanchao Fan, Jan Griesfeller, Alf Grini, Chuncheng Guo, Mehmet Ilicak, Inger Helene Hafsahl Karset, Oskar Landgren, Johan Liakka, Kine Onsum Moseid, Aleksi Nummelin, Clemens Spensberger, Hui Tang, Zhongshi Zhang, Christoph Heinze, Trond Iversen, and Michael Schulz
Geosci. Model Dev., 13, 6165–6200, https://doi.org/10.5194/gmd-13-6165-2020, https://doi.org/10.5194/gmd-13-6165-2020, 2020
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The second version of the coupled Norwegian Earth System Model (NorESM2) is presented and evaluated. The temperature and precipitation patterns has improved compared to NorESM1. The model reaches present-day warming levels to within 0.2 °C of observed temperature but with a delayed warming during the late 20th century. Under the four scenarios (SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5), the warming in the period of 2090–2099 compared to 1850–1879 reaches 1.3, 2.2, 3.1, and 3.9 K.
Anne L. Morée and Jörg Schwinger
Earth Syst. Sci. Data, 12, 2971–2985, https://doi.org/10.5194/essd-12-2971-2020, https://doi.org/10.5194/essd-12-2971-2020, 2020
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This dataset consists of eight variables needed in ocean modelling and is made to support modelers of the Last Glacial Maximum (LGM; 21 000 years ago) ocean. The LGM is a time of specific interest for climate researchers. The data are based on the results of state-of-the-art climate models and are the best available estimate of these variables for the LGM. The dataset shows clear spatial patterns but large uncertainties and is presented in a way that facilitates applications in any ocean model.
Cited articles
Adkins J. F.: The role of deep ocean circulation in setting glacial
climates, Paleoceanography, 28, 539–561, https://doi.org/10.1002/palo.20046, 2013.
Armstrong, R. A., Lee, C., Hedges, J. I., Honjo, S., and Wakeham, S. G.: A
new, mechanistic model for organic carbon fluxes in the ocean based on the
quantitative association of POC with ballast minerals, Deep-Sea Res Pt. II,
49, 219–236, https://doi.org/10.1016/S0967-0645(01)00101-1, 2001.
Assmann, K. M., Bentsen, M., Segschneider, J., and Heinze, C.: An isopycnic ocean carbon cycle model, Geosci. Model Dev., 3, 143–167, https://doi.org/10.5194/gmd-3-143-2010, 2010.
Bach, L. T., Stange, P., Taucher, J., Achterberg, E. P., Alguero-Muniz, M.,
Horn, H., Esposito, M., and Riebesell, U.: The Influence of Plankton
Community Structure on Sinking Velocity and Remineralization Rate of Marine
Aggregates, Global Biogeochemical Cy., 33, 971–994, https://doi.org/10.1029/2019gb006256,
2019.
Bentsen, M., Bethke, I., Debernard, J. B., Iversen, T., Kirkevåg, A., Seland, Ø., Drange, H., Roelandt, C., Seierstad, I. A., Hoose, C., and Kristjánsson, J. E.: The Norwegian Earth System Model, NorESM1-M – Part 1: Description and basic evaluation of the physical climate, Geosci. Model Dev., 6, 687–720, https://doi.org/10.5194/gmd-6-687-2013, 2013.
Bereiter, B., Shackleton, S., Baggenstos, D., Kawamura, K., and
Severinghaus, J.: Mean global ocean temperatures during the last glacial
transition, Nature, 553, 39–44, https://doi.org/10.1038/nature25152, 2018.
Bernardello, R., Marinov, I., Palter, J. B., Sarmiento, J. L., Galbraith, E.
D., and Slater, R. D.: Response of the Ocean Natural Carbon Storage to
Projected Twenty-First-Century Climate Change, J. Climate, 27,
2033–2053, https://doi.org/10.1175/JCLI-D-13-00343.1, 2014.
Bopp, L., Kohfeld Karen, E., Le Quéré, C., and Aumont, O.: Dust
impact on marine biota and atmospheric CO2 during glacial periods,
Paleoceanography, 18, 1046, https://doi.org/10.1029/2002PA000810, 2003.
Bopp, L., Resplandy, L., Untersee, A., Le Mezo, P., and Kageyama, M.: Ocean
(de)oxygenation from the Last Glacial Maximum to the twenty-first century:
insights from Earth System models, Philos. T. R. Soc. A, 375,
20160323, https://doi.org/10.1098/rsta.2016.0323, 2017.
Bouttes, N., Paillard, D., Roche, D. M., Brovkin, V., and Bopp, L.: Last
Glacial Maximum CO2 and δ13C successfully reconciled,
Geophys. Res. Lett., 38, L02705, https://doi.org/10.1029/2010GL044499, 2011.
Braconnot, P., Harrison, S., Kageyama, M., Bartlein, P., Masson-Delmotte,
V., Abe-Ouchi, A., Otto-Bliesner, B., and Zhao, Y.: Evaluation of climate
models using palaeoclimatic data, Nat. Clim. Change, 2, 417–424,
https://doi.org/10.1038/nclimate1456, 2012.
Broecker, W. S.: “NO”, a conservative water-mass tracer, Earth
Planet. Sci. Lett., 23, 100–107, https://doi.org/10.1016/0012-821X(74)90036-3, 1974.
Broecker, W. S.: Glacial to interglacial changes in ocean chemistry,
Prog. Oceanogr., 11, 151–197, https://doi.org/10.1016/0079-6611(82)90007-6, 1982.
Broecker, W. S. and McGee, D.: The 13C record for atmospheric
CO2: What is it trying to tell us?, Earth Planet. Sci.
Lett., 368, 175–182, https://doi.org/10.1016/j.epsl.2013.02.029, 2013.
Broecker, W. S. and Peng, T.-H.: Carbon Cycle: 1985 Glacial to Interglacial
Changes in the Operation of the Global Carbon Cycle, Radiocarbon, 28,
309–327, https://doi.org/10.1017/S0033822200007414, 1986.
Brovkin, V., Ganopolski, A., Archer, D., and Rahmstorf, S.: Lowering of
glacial atmospheric CO2 in response to changes in oceanic circulation
and marine biogeochemistry, Paleoceanography, 22, Pa4202,
https://doi.org/10.1029/2006pa001380, 2007.
Buchanan, P. J., Matear, R. J., Lenton, A., Phipps, S. J., Chase, Z., and Etheridge, D. M.: The simulated climate of the Last Glacial Maximum and insights into the global marine carbon cycle, Clim. Past, 12, 2271–2295, https://doi.org/10.5194/cp-12-2271-2016, 2016.
Burckel, P., Waelbroeck, C., Luo, Y., Roche, D. M., Pichat, S., Jaccard, S. L., Gherardi, J., Govin, A., Lippold, J., and Thil, F.: Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka), Clim. Past, 12, 2061–2075, https://doi.org/10.5194/cp-12-2061-2016, 2016.
Burke, A., Stewart, A. L., Adkins, J. F., Ferrari, R., Jansen, M. F., and
Thompson, A. F.: The glacial mid-depth radiocarbon bulge and its
implications for the overturning circulation, Paleoceanography, 30,
1021–1039, https://doi.org/10.1002/2015PA002778, 2015.
Böhm, E., Lippold, J., Gutjahr, M., Frank, M., Blaser, P., Antz, B.,
Fohlmeister, J., Frank, N., Andersen, M. B., and Deininger, M.: Strong and
deep Atlantic meridional overturning circulation during the last glacial
cycle, Nature, 517, 73–76, https://doi.org/10.1038/nature14059, 2014.
Chowdhury, P. and Behera, M. R.: Evaluation of CMIP5 and CORDEX derived
wave climate in Indian Ocean, Clim. Dynam., 52, 4463–4482,
https://doi.org/10.1007/s00382-018-4391-0, 2019.
Costa, K. M., McManus, J. F., Anderson, R. F., Ren, H., Sigman, D. M.,
Winckler, G., Fleisher, M. Q., Marcantonio, F., and Ravelo, A. C.: No iron
fertilization in the equatorial Pacific Ocean during the last ice age,
Nature, 529, 519–522, https://doi.org/10.1038/nature16453, 2016.
Craig, H.: Isotopic standards for carbon and oxygen and correction factors
for mass-spectrometric analysis of carbon dioxide, Geochim.
Cosmochim. Ac., 12, 133–149, https://doi.org/10.1016/0016-7037(57)90024-8, 1957.
Crucifix, M.: Distribution of carbon isotopes in the glacial ocean: A model
study, Paleoceanography, 20, PA4020, https://doi.org/10.1029/2005PA001131, 2005.
Danabasoglu, G., Yeager, S. G., Bailey, D., Behrens, E., Bentsen, M., Bi,
D., Biastoch, A., Böning, C., Bozec, A., Canuto, V. M., Cassou, C.,
Chassignet, E., Coward, A. C., Danilov, S., Diansky, N., Drange, H.,
Farneti, R., Fernandez, E., Fogli, P. G., Forget, G., Fujii, Y., Griffies,
S. M., Gusev, A., Heimbach, P., Howard, A., Jung, T., Kelley, M., Large, W.
G., Leboissetier, A., Lu, J., Madec, G., Marsland, S. J., Masina, S.,
Navarra, A., George Nurser, A. J., Pirani, A., y Mélia, D. S., Samuels,
B. L., Scheinert, M., Sidorenko, D., Treguier, A.-M., Tsujino, H., Uotila,
P., Valcke, S., Voldoire, A., and Wang, Q.: North Atlantic simulations in
Coordinated Ocean-ice Reference Experiments phase II (CORE-II). Part I: Mean
states, Ocean Model., 73, 76–107, https://doi.org/10.1016/j.ocemod.2013.10.005, 2014.
De Boyer Montégut, C., Madec, G., Fischer, A. S., Lazar, A., and
Iudicone, D.: Mixed layer depth over the global ocean: An examination of
profile data and a profile-based climatology, J. Geophys.
Res.-Oceans, 109, C12003, https://doi.org/10.1029/2004JC002378, 2004.
De La Rocha, C. L. and Passow, U.: Factors influencing the sinking of POC
and the efficiency of the biological carbon pump, Deep-Sea Res. Pt. II, 54,
639–658, https://doi.org/10.1016/j.dsr2.2007.01.004, 2007.
DeVries, T., Primeau, F., and Deutsch, C.: The sequestration efficiency of
the biological pump, Geophys. Res. Lett., 39, L13601,
https://doi.org/10.1029/2012GL051963, 2012.
Donohue, K. A., Tracey, K. L., Watts, D. R., Chidichimo, M. P., and
Chereskin, T. K.: Mean Antarctic Circumpolar Current transport measured in
Drake Passage, Geophys. Res. Lett., 43, 11760–11767,
https://doi.org/10.1002/2016GL070319, 2016.
Duplessy, J. C., Shackleton, N. J., Fairbanks, R. G., Labeyrie, L., Oppo,
D., and Kallel, N.: Deepwater source variations during the last climatic
cycle and their impact on the global deepwater circulation,
Paleoceanography, 3, 343–360, https://doi.org/10.1029/PA003i003p00343, 1988.
Edwards, N. R., Willmott, A. J., and Killworth, P. D.: On the Role of
Topography and Wind Stress on the Stability of the Thermohaline Circulation,
J. Phys. Oceanogr., 28, 756–778,
https://doi.org/10.1175/1520-0485(1998)028<0756:OTROTA<2.0.CO;2, 1998.
Eide, M., Olsen, A., Ninnemann, U. S., and Johannessen, T.: A global ocean
climatology of preindustrial and modern ocean δ13C, Global
Biogeochem. Cy., 31, 515–534, https://doi.org/10.1002/2016GB005473, 2017.
EPICA Project Members: Eight glacial cycles from an Antarctic ice core,
Nature, 429, 623–628, https://doi.org/10.1038/nature02599, 2004.
Ferrari, R., Jansen, M. F., Adkins, J. F., Burke, A., Stewart, A. L., and
Thompson, A. F.: Antarctic sea ice control on ocean circulation in present
and glacial climates, P. Natl. Acad. Sci. USA, 111,
8753, https://doi.org/10.1073/pnas.1323922111, 2014.
Filippelli, G. M., Latimer, J. C., Murray, R. W., and Flores, J.-A.:
Productivity records from the Southern Ocean and the equatorial Pacific
Ocean: Testing the glacial Shelf-Nutrient Hypothesis, Deep Sea Res. Pt.
II, 54, 2443–2452, https://doi.org/10.1016/j.dsr2.2007.07.021, 2007.
Freeman, E., Skinner, L. C., Waelbroeck, C., and Hodell, D.: Radiocarbon
evidence for enhanced respired carbon storage in the Atlantic at the Last
Glacial Maximum, Nat. Commun., 7, 11998, https://doi.org/10.1038/ncomms11998, 2016.
Galbraith, E. and de Lavergne, C.: Response of a comprehensive climate
model to a broad range of external forcings: relevance for deep ocean
ventilation and the development of late Cenozoic ice ages, Clim. Dynam., 52,
653–679, https://doi.org/10.1007/s00382-018-4157-8, 2019.
Galbraith, E. D. and Skinner, L. C.: The Biological Pump During the Last
Glacial Maximum, Ann. Rev. Mar. Sci., 12, 559–586,
https://doi.org/10.1146/annurev-marine-010419-010906, 2020.
Ganopolski, A. and Brovkin, V.: Simulation of climate, ice sheets and CO2 evolution during the last four glacial cycles with an Earth system model of intermediate complexity, Clim. Past, 13, 1695–1716, https://doi.org/10.5194/cp-13-1695-2017, 2017.
Gebbie, G.: How much did Glacial North Atlantic Water shoal?,
Paleoceanography, 29, 190–209, https://doi.org/10.1002/2013PA002557, 2014.
Gebbie, G. and Huybers, P.: The Mean Age of Ocean Waters Inferred from
Radiocarbon Observations: Sensitivity to Surface Sources and Accounting for
Mixing Histories, J. Phys. Oceanogr., 42, 291–305,
https://doi.org/10.1175/jpo-d-11-043.1, 2012.
Gebbie, G., Peterson, C. D., Lisiecki, L. E., and Spero, H. J.: Global-mean
marine δ13C and its uncertainty in a glacial state estimate,
Quaternary Sci. Rev., 125, 144–159, https://doi.org/10.1016/j.quascirev.2015.08.010,
2015.
Gersonde, R., Crosta, X., Abelmann, A., and Armand, L.: Sea-surface
temperature and sea ice distribution of the Southern Ocean at the EPILOG
Last Glacial Maximum–a circum-Antarctic view based on siliceous
microfossil records, Quaternary Sci. Rev., 24, 869–896,
https://doi.org/10.1016/j.quascirev.2004.07.015, 2005.
Gottschalk, J., Skinner, L. C., Lippold, J., Vogel, H., Frank, N., Jaccard,
S. L., and Waelbroeck, C.: Biological and physical controls in the Southern
Ocean on past millennial-scale atmospheric CO2 changes, Nat.
Commun., 7, 11539, https://doi.org/10.1038/ncomms11539, 2016a.
Gottschalk, J., Vázquez Riveiros, N., Waelbroeck, C., Skinner, L. C.,
Michel, E., Duplessy, J.-C., Hodell, D. A., and Mackensen, A.: Stable oxygen
and carbon isotopes of C. wuellerstorfi, C. kullenbergi and Uvigerina spp.
from MD07-3076Q (sub-Antarctic Atlantic) over the last 22 kyrs, PANGAEA, https://doi.org/10.1594/PANGAEA.858257, 2016b.
Gottschalk, J., Vázquez Riveiros, N., Waelbroeck, C., Skinner, L. C.,
Michel, E., Duplessy, J.-C., Hodell, D. A., and Mackensen, A.: Stable oxygen
and carbon isotopes of C. wuellerstorfi, C. kullenbergi and Uvigerina spp.
from TN057-6GC (sub-Antarctic Atlantic) over the last 29 kyrs, PANGAEA, https://doi.org/10.1594/PANGAEA.858264, 2016c.
Gruber, N., Keeling, C. D., Bacastow, R. B., Guenther, P. R., Lueker, T. J.,
Wahlen, M., Meijer, H. A. J., Mook, W. G., and Stocker, T. F.:
Spatiotemporal patterns of carbon-13 in the global surface oceans and the
oceanic suess effect, Global Biogeochem. Cy., 13, 307–335,
https://doi.org/10.1029/1999GB900019, 1999.
Guo, C., Bentsen, M., Bethke, I., Ilicak, M., Tjiputra, J., Toniazzo, T., Schwinger, J., and Otterå, O. H.: Description and evaluation of NorESM1-F: a fast version of the Norwegian Earth System Model (NorESM), Geosci. Model Dev., 12, 343–362, https://doi.org/10.5194/gmd-12-343-2019, 2019.
Haake, B. and Ittekkot, V.: The Wind-Driven Biological Pump and Carbon
Removal in the Ocean, Naturwissenschaften, 77, 75–79, https://doi.org/10.1007/Bf01131777, 1990.
Heinze, C. and Hasselmann, K.: Inverse Multiparameter Modeling of
Paleoclimate Carbon Cycle Indices, Quaternary Res., 40, 281–296,
https://doi.org/10.1006/qres.1993.1082, 1993.
Heinze, C., Maier-Reimer, E., and Winn, K.: Glacial pCO2 Reduction by the World Ocean: Experiments With the Hamburg Carbon Cycle Model, Paleoceanography, 6, 395–430, https://doi.org/10.1029/91PA00489, 1991.
Heinze, C., Hoogakker, B. A. A., and Winguth, A.: Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling, Clim. Past, 12, 1949–1978, https://doi.org/10.5194/cp-12-1949-2016, 2016.
Hesse, T., Butzin, M., Bickert, T., and Lohmann, G.: A model-data comparison
of delta C-13 in the glacial Atlantic Ocean, Paleoceanography, 26,
Pa3220, https://doi.org/10.1029/2010pa002085, 2011.
Ho, S. and Laepple, T.: Glacial cooling as inferred from marine temperature
proxies TEX
Hodell, D. A. and Channell, J. E. T.: Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate, Clim. Past, 12, 1805–1828, https://doi.org/10.5194/cp-12-1805-2016, 2016.
Honda, M. C. and Watanabe, S.: Importance of biogenic opal as ballast of
particulate organic carbon (POC) transport and existence of mineral
ballast-associated and residual POC in the Western Pacific Subarctic Gyre,
Geophys. Res. Lett., 37, L02605, https://doi.org/10.1029/2009gl041521, 2010.
Howe, J. N. W. and Piotrowski, A. M.: (Table S2) Stable carbon and oxygen
isotopic composition of benthic foraminifera of ODP Site 154-929, PANGAEA, https://doi.org/10.1594/PANGAEA.882968, 2017.
Ito, T. and Follows, M. J.: Preformed phosphate, soft tissue pump and
atmospheric CO2, J. Marine Res., 63, 813–839,
https://doi.org/10.1357/0022240054663231, 2005.
Ito, T., Follows, M. J., and Boyle, E. A.: Is AOU a good measure of
respiration in the oceans?, Geophys. Res. Lett., 31, L17305,
https://doi.org/10.1029/2004GL020900, 2004.
Jaccard, S. L., Galbraith, E. D., Sigman, D. M., Haug, G. H., Francois, R.,
Pedersen, T. F., Dulski, P., and Thierstein, H. R.: Subarctic Pacific
evidence for a glacial deepening of the oceanic respired carbon pool, Earth Planet. Sci. Lett., 277, 156–165, https://doi.org/10.1016/j.epsl.2008.10.017, 2009.
Jaccard, S. L. and Galbraith, E. D.: Large climate-driven changes of
oceanic oxygen concentrations during the last deglaciation, Nat.
Geosci., 5, 151, https://doi.org/10.1038/ngeo1352, 2011.
Jansen, M. F.: Glacial ocean circulation and stratification explained by
reduced atmospheric temperature, P. Natl. Acad. Sci. USA, 114, 45–50, https://doi.org/10.1073/pnas.1610438113, 2017.
Jeltsch-Thömmes, A., Battaglia, G., Cartapanis, O., Jaccard, S. L., and Joos, F.: Low terrestrial carbon storage at the Last Glacial Maximum: constraints from multi-proxy data, Clim. Past, 15, 849–879, https://doi.org/10.5194/cp-15-849-2019, 2019.
Kageyama, M., Albani, S., Braconnot, P., Harrison, S. P., Hopcroft, P. O., Ivanovic, R. F., Lambert, F., Marti, O., Peltier, W. R., Peterschmitt, J.-Y., Roche, D. M., Tarasov, L., Zhang, X., Brady, E. C., Haywood, A. M., LeGrande, A. N., Lunt, D. J., Mahowald, N. M., Mikolajewicz, U., Nisancioglu, K. H., Otto-Bliesner, B. L., Renssen, H., Tomas, R. A., Zhang, Q., Abe-Ouchi, A., Bartlein, P. J., Cao, J., Li, Q., Lohmann, G., Ohgaito, R., Shi, X., Volodin, E., Yoshida, K., Zhang, X., and Zheng, W.: The PMIP4 contribution to CMIP6 – Part 4: Scientific objectives and experimental design of the PMIP4-CMIP6 Last Glacial Maximum experiments and PMIP4 sensitivity experiments, Geosci. Model Dev., 10, 4035–4055, https://doi.org/10.5194/gmd-10-4035-2017, 2017.
Key, R. M., Kozyr, A., Sabine, C. L., Lee, K., Wanninkhof, R., Bullister, J.
L., Feely, R. A., Millero, F. J., Mordy, C., and Peng, T. H.: A global ocean
carbon climatology: Results from Global Data Analysis Project (GLODAP),
Global Biogeochem. Cy., 18, GB4031, https://doi.org/10.1029/2004GB002247, 2004.
Khatiwala, S., Schmittner, A., and Muglia, J.: Air-sea disequilibrium
enhances ocean carbon storage during glacial periods, Sci. Adv., 5,
eaaw4981, https://doi.org/10.1126/sciadv.aaw4981, 2019.
Klaas, C. and Archer, D. E.: Association of sinking organic matter with
various types of mineral ballast in the deep sea: Implications for the rain
ratio, Global Biogeochem. Cy., 16, 1116, https://doi.org/10.1029/2001gb001765, 2002.
Kleypas, J. A.: Modeled estimates of global reef habitat and carbonate
production since the last glacial maximum, Paleoceanography, 12, 533–545,
https://doi.org/10.1029/97PA01134, 1997.
Klockmann, M., Mikolajewicz, U., and Marotzke, J.: The effect of greenhouse gas concentrations and ice sheets on the glacial AMOC in a coupled climate model, Clim. Past, 12, 1829–1846, https://doi.org/10.5194/cp-12-1829-2016, 2016.
Kobayashi, H., Abe-Ouchi, A., and Oka, A.: Role of Southern Ocean
stratification in glacial atmospheric CO2 reduction evaluated by a
three-dimensional ocean general circulation model, Paleoceanography, 30,
1202–1216, https://doi.org/10.1002/2015pa002786, 2015.
Kobayashi, H. and Oka, A.: Response of Atmospheric pCO2 to Glacial Changes in the Southern Ocean Amplified by Carbonate Compensation,
Paleoceanogr. Paleoclimatol., 33, 1206–1229, https://doi.org/10.1029/2018pa003360,
2018.
Kohfeld, K. E., Quéré, C. L., Harrison, S. P., and Anderson, R. F.:
Role of Marine Biology in Glacial-Interglacial CO2 Cycles, Science,
308, 74–78, https://doi.org/10.1126/science.1105375, 2005.
Kurahashi-Nakamura, T., Paul, A., and Losch, M.: Dynamical reconstruction of
the global ocean state during the Last Glacial Maximum, Paleoceanography,
32, 326–350, https://doi.org/10.1002/2016PA003001, 2017.
Lambert, F., Tagliabue, A., Shaffer, G., Lamy, F., Winckler, G., Farias, L., Gallardo, L., and De Pol‐Holz, R.: Dust fluxes and iron fertilization in Holocene and Last Glacial Maximum climates, Geophys. Res. Lett., 42, 6014–6023, https://doi.org/10.1002/2015GL064250, 2015.
Lamy, F., Gersonde, R., Winckler, G., Esper, O., Jaeschke, A., Kuhn, G.,
Ullermann, J., Martinez-Garcia, A., Lambert, F., and Kilian, R.: Increased
Dust Deposition in the Pacific Southern Ocean During Glacial Periods,
Science, 343, 403–407, https://doi.org/10.1126/science.1245424, 2014.
Lamy, F., Arz, H. W., Kilian, R., Lange, C. B., Lembke-Jene, L., Wengler,
M., Kaiser, J., Baeza-Urrea, O., Hall, I. R., Harada, N., and Tiedemann, R.:
Glacial reduction and millennial-scale variations in Drake Passage
throughflow, P. Natl Acad. Sci. USA, 112, 13496, https://doi.org/10.1073/pnas.1509203112, 2015.
Large, W. G. and Yeager, S. G.: Diurnal to decadal global forcing for ocean and sea-ice models: the data sets and flux climatologies, Tech. Note NCAR/TN-460+STR, National Center of Atmospheric Research, Boulder, Colorado, USA, available at: https://opensky.ucar.edu/islandora/object/technotes:434 (last acceess: 6 Febraury 2021), 2004.
Laws, E. A., Bidigare, R., R., and Popp, B. N.: Effects of growth rate and
CO2 concentration on carbon isotopic fractionation by the marine diatom Phaeodactylum tricornutum, Limnol. Oceanogr., 42, 1552–1560,
https://doi.org/10.4319/lo.1997.42.7.1552, 1997.
Lynch-Stieglitz, J., Stocker, T. F., Broecker, W. S., and Fairbanks, R. G.:
The influence of air-sea exchange on the isotopic composition of oceanic
carbon: Observations and modeling, Global Biogeochem. Cy., 9, 653–665,
https://doi.org/10.1029/95GB02574, 1995.
Lynch-Stieglitz, J., Adkins, J. F., Curry, W. B., Dokken, T., Hall, I. R.,
Herguera, J. C., Hirschi, J. J. M., Ivanova, E. V., Kissel, C., Marchal, O., Marchitto, T. M., McCave, I. N., McManus, J. F., Mulitza, S., Ninnemann, U., Peeters, F., Yu, E.-F., and Zahn, R.: Atlantic Meridional Overturning Circulation During the Last Glacial Maximum, Science, 316, 66–69, https://doi.org/10.1126/science.1137127, 2007.
Lynch-Stieglitz, J., Ito, T., and Michel, E.: Antarctic density
stratification and the strength of the circumpolar current during the Last
Glacial Maximum, Paleoceanography, 31, 539–552, https://doi.org/10.1002/2015PA002915, 2016.
Mahowald, N. M., Muhs, D. R., Levis, S., Rasch, P. J., Yoshioka, M., Zender, C. S., and Luo, C.: Change in atmospheric mineral aerosols in response to climate: Last glacial period, preindustrial, modern, and doubled carbon dioxide climates, J. Geophys. Res.-Atmos., 111, D10202,
https://doi.org/10.1029/2005JD006653, 2006.
Maier-Reimer, E.: Geochemical cycles in an ocean general circulation model.
Preindustrial tracer distributions, Global Biogeochem. Cy., 7,
645–677, https://doi.org/10.1029/93GB01355, 1993.
Maier-Reimer, E., Kriest, I., Segschneider, J., and Wetzel, P.: The Hamburg
Oceanic Carbon Cycle Circulation model HAMOCC5.1 – Technical Description
Release 1.1, Max Planck Institute for Meteorology, Hamburg, Germany, 2005.
Marchitto, T. M. and Broecker, W. S.: Deep water mass geometry in the
glacial Atlantic Ocean: A review of constraints from the paleonutrient proxy Cd/Ca, Geochem. Geophy. Geosy., 7, Q12003, https://doi.org/10.1029/2006GC001323, 2006.
MARGO Project Members: Constraints on the magnitude and patterns of ocean
cooling at the Last Glacial Maximum, Nat. Geosci., 2, 127,
https://doi.org/10.1038/ngeo411, 2009.
Mari, X., Passow, U., Migon, C., Burd, A. B., and Legendre, L.: Transparent
exopolymer particles: Effects on carbon cycling in the ocean, Prog.
Oceanogr., 151, 13–37, https://doi.org/10.1016/j.pocean.2016.11.002, 2017.
Mariotti, V., Paillard, D., Bopp, L., Roche, D. M., and Bouttes, N.: A
coupled model for carbon and radiocarbon evolution during the last
deglaciation, Geophys. Res. Lett., 43, 1306–1313,
https://doi.org/10.1002/2015GL067489, 2016.
Marzocchi, A. and Jansen, M. F.: Connecting Antarctic sea ice to deep-ocean
circulation in modern and glacial climate simulations, Geophys. Res.
Lett., 44, 6286–6295, https://doi.org/10.1002/2017GL073936, 2017.
Marzocchi, A. and Jansen, M. F.: Global cooling linked to increased glacial
carbon storage via changes in Antarctic sea ice, Nat. Geosci., 12,
1001–1005, https://doi.org/10.1038/s41561-019-0466-8, 2019.
Mazaud, A., Michel, E., Dewilde, F., and Turon, J. L.: Variations of the
Antarctic Circumpolar Current intensity during the past 500 ka,
Geochem. Geophy. Geosy., 11, Q08007, https://doi.org/10.1029/2010GC003033, 2010.
McCarthy, G. D., Smeed, D. A., Johns, W. E., Frajka-Williams, E., Moat, B.
I., Rayner, D., Baringer, M. O., Meinen, C. S., Collins, J., and Bryden, H.
L.: Measuring the Atlantic Meridional Overturning Circulation at
26∘ N, Prog. Oceanogr., 130, 91–111,
https://doi.org/10.1016/j.pocean.2014.10.006, 2015.
McCave, I. N., Crowhurst, S. J., Kuhn, G., Hillenbrand, C. D., and Meredith, M. P.: Minimal change in Antarctic Circumpolar Current flow speed between the last glacial and Holocene, Nat. Geosci., 7, 113–116, https://doi.org/10.1038/ngeo2037, 2013.
McManus, J. F., Francois, R., Gherardi, J. M., Keigwin, L. D., and
Brown-Leger, S.: Collapse and rapid resumption of Atlantic meridional
circulation linked to deglacial climate changes, Nature, 428, 834–837,
https://doi.org/10.1038/nature02494, 2004.
Mendes, P. A. D. and Thomsen, L.: Effects of Ocean Acidification on the
Ballast of Surface Aggregates Sinking through the Twilight Zone, Plos One,
7, e50865, https://doi.org/10.1371/journal.pone.0050865, 2012.
Menviel, L., Yu, J., Joos, F., Mouchet, A., Meissner, K. J., and England, M. H.: Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study, Paleoceanography, 32, 2–17, https://doi.org/10.1002/2016pa003024, 2017.
Menviel, L. C., Spence, P., Skinner, L. C., Tachikawa, K., Friedrich, T.,
Missiaen, L., and Yu, J.: Enhanced Mid-depth Southward Transport in the
Northeast Atlantic at the Last Glacial Maximum Despite a Weaker AMOC,
Paleoceanogr. Paleoclimatol., 35, e2019PA003793, https://doi.org/10.1029/2019PA003793, 2020.
Milliman, J. D.: Production and accumulation of calcium carbonate in the
ocean: Budget of a nonsteady state, Global Biogeochem. Cy., 7,
927–957, https://doi.org/10.1029/93GB02524, 1993.
Mitchell, D., AchutaRao, K., Allen, M., Bethke, I., Beyerle, U., Ciavarella, A., Forster, P. M., Fuglestvedt, J., Gillett, N., Haustein, K., Ingram, W., Iversen, T., Kharin, V., Klingaman, N., Massey, N., Fischer, E., Schleussner, C.-F., Scinocca, J., Seland, Ø., Shiogama, H., Shuckburgh, E., Sparrow, S., Stone, D., Uhe, P., Wallom, D., Wehner, M., and Zaaboul, R.: Half a degree additional warming, prognosis and projected impacts (HAPPI): background and experimental design, Geosci. Model Dev., 10, 571–583, https://doi.org/10.5194/gmd-10-571-2017, 2017.
Molina-Kescher, M., Frank, M., Tapia, R., Ronge, T. A., Nürnberg, D.,
and Tiedemann, R.: Radiogenic neodymium, strontium and lead isotopes of
authigenic and detrital sedimentary phases and stable oxygen and carbon
isotopes of benthic foraminifera from gravity cores SO213-59-2 and
SO213-60-1 (central South Pacific), PANGAEA, https://doi.org/10.1594/PANGAEA.861362, 2016.
Mook, W. G.: 13C in atmospheric CO2, Neth. J. Sea Res., 20, 211–223, https://doi.org/10.1016/0077-7579(86)90043-8, 1986.
Morée, A. and Schwinger, J.: Last Glacial Maximum minus pre-industrial anomaly fields for use in forced ocean modelling, based on PMIP3, Norstore, https://doi.org/10.11582/2019.00011, 2019.
Morée, A. L. and Schwinger, J.: A Last Glacial Maximum forcing dataset for ocean modelling, Earth Syst. Sci. Data, 12, 2971–2985, https://doi.org/10.5194/essd-12-2971-2020, 2020.
Morée, A. L., Schwinger, J., and Heinze, C.: Southern Ocean controls of the vertical marine δ13C gradient – a modelling study, Biogeosciences, 15, 7205–7223, https://doi.org/10.5194/bg-15-7205-2018, 2018.
Morée, A., Schwinger, J., Bethke, I., and Heinze, C.: Ocean output of
NorESM-OC simulation of the Pre-Industrial control (∼1850), Dataset, Norstore, https://doi.org/10.11582/2020.00061, 2020a.
Morée, A., Schwinger, J., Bethke, I., and Heinze, C.: Ocean output of
NorESM-OC simulation of the Last Glacial Maximum (21 kya), Data set,
Norstore, https://doi.org/10.11582/2020.00062, 2020b.
Moy, A. D., Palmer, M. R., Howard, W. R., Bijma, J., Cooper, M. J., Calvo,
E., Pelejero, C., Gagan, M. K., and Chalk, T. B.: Varied contribution of the
Southern Ocean to deglacial atmospheric CO2 rise, Nat. Geosci., 12, 1006–1011, https://doi.org/10.1038/s41561-019-0473-9, 2019.
Muglia, J. and Schmittner, A.: Glacial Atlantic overturning increased by
wind stress in climate models, Geophys. Res. Lett., 42, 9862–9868,
https://doi.org/10.1002/2015gl064583, 2015.
Muglia, J., Skinner, L. C., and Schmittner, A.: Weak overturning circulation
and high Southern Ocean nutrient utilization maximized glacial ocean carbon,
Earth Planet. Sci. Lett., 496, 47–56, https://doi.org/10.1016/j.epsl.2018.05.038,
2018.
Müller, J. and Joos, F.: Global peatland area and carbon dynamics from the Last Glacial Maximum to the present – a process-based model investigation, Biogeosciences, 17, 5285–5308, https://doi.org/10.5194/bg-17-5285-2020, 2020.
Müller, S. A., Joos, F., Edwards, N. R., and Stocker, T. F.: Water Mass
Distribution and Ventilation Time Scales in a Cost-Efficient,
Three-Dimensional Ocean Model, J. Climate, 19, 5479–5499,
https://doi.org/10.1175/JCLI3911.1, 2006.
Nadeau, L.-P., Ferrari, R., and Jansen, M. F.: Antarctic Sea Ice Control on
the Depth of North Atlantic Deep Water, J. Climate, 32, 2537–2551,
https://doi.org/10.1175/JCLI-D-18-0519.1, 2019.
Oka, A., Abe-Ouchi, A., Chikamoto, M. O., and Ide, T.: Mechanisms
controlling export production at the LGM: Effects of changes in oceanic
physical fields and atmospheric dust deposition, Global Biogeochem.
Cy., 25, GB2009, https://doi.org/10.1029/2009GB003628, 2011.
Oliver, K. I. C., Hoogakker, B. A. A., Crowhurst, S., Henderson, G. M., Rickaby, R. E. M., Edwards, N. R., and Elderfield, H.: A synthesis of marine sediment core δ13C data over the last 150 000 years, Clim. Past, 6, 645–673, https://doi.org/10.5194/cp-6-645-2010, 2010.
Oppo, D. W., Gebbie, G., Huang, K.-F., Curry, W. B., Marchitto, T. M., and
Pietro, K. R.: Data Constraints on Glacial Atlantic Water Mass Geometry and
Properties, Paleoceanogr. Paleoclimatol., 33, 1013–1034,
https://doi.org/10.1029/2018PA003408, 2018.
Ödalen, M., Nycander, J., Oliver, K. I. C., Brodeau, L., and Ridgwell, A.: The influence of the ocean circulation state on ocean carbon storage and CO2 drawdown potential in an Earth system model, Biogeosciences, 15, 1367–1393, https://doi.org/10.5194/bg-15-1367-2018, 2018.
Ödalen, M., Nycander, J., Ridgwell, A., Oliver, K. I. C., Peterson, C. D., and Nilsson, J.: Variable C
Peterson, C. D., Lisiecki, L. E., and Stern, J. V.: Deglacial whole-ocean
δ13C change estimated from 480 benthic foraminiferal records, Paleoceanography, 29, 549–563, https://doi.org/10.1002/2013PA002552, 2014.
Primeau, F. W., Holzer, M., and DeVries, T.: Southern Ocean nutrient
trapping and the efficiency of the biological pump, J. Geophys.
Res.-Oceans, 118, 2547–2564, https://doi.org/10.1002/jgrc.20181, 2013.
Rae, J. W. B., Burke, A., Robinson, L. F., Adkins, J. F., Chen, T., Cole,
C., Greenop, R., Li, T., Littley, E. F. M., Nita, D. C., Stewart, J. A., and Taylor, B. J.: CO2 storage and release in the deep Southern Ocean on millennial to centennial timescales, Nature, 562, 569–573,
https://doi.org/10.1038/s41586-018-0614-0, 2018.
Rahmstorf, S.: On the freshwater forcing and transport of the Atlantic
thermohaline circulation, Clim. Dynam., 12, 799–811,
https://doi.org/10.1007/s003820050144, 1996.
Ridgwell, A. J., Watson, A. J., Maslin, M. A., and Kaplan, J. O.:
Implications of coral reef buildup for the controls on atmospheric CO2 since the Last Glacial Maximum, Paleoceanography, 18, 1083, https://doi.org/10.1029/2003PA000893, 2003.
Ritz, S. P., Stocker, T. F., and Joos, F.: A Coupled Dynamical Ocean–Energy Balance Atmosphere Model for Paleoclimate Studies, J. Climate, 24, 349–375, 2011.
Roche, D. M., Crosta, X., and Renssen, H.: Evaluating Southern Ocean sea-ice for the Last Glacial Maximum and pre-industrial climates: PMIP-2 models and data evidence, Quaternary Sci. Rev., 56, 99–106,
https://doi.org/10.1016/j.quascirev.2012.09.020, 2012.
Roth, R., Ritz, S. P., and Joos, F.: Burial-nutrient feedbacks amplify the sensitivity of atmospheric carbon dioxide to changes in organic matter remineralisation, Earth Syst. Dynam., 5, 321–343, https://doi.org/10.5194/esd-5-321-2014, 2014.
Sarmiento, J. L., Gruber, N., Brzezinski, M. A., and Dunne, J. P.:
High-latitude controls of thermocline nutrients and low latitude biological
productivity, Nature, 427, 56–60, https://doi.org/10.1038/nature02127, 2004.
Sarmiento, J. L. and Gruber, N.: Ocean biogeochemical dynamics, Princeton
University Press, Princeton, 2006.
Schmitt, J., Schneider, R., Elsig, J., Leuenberger, D., Lourantou, A.,
Chappellaz, J., Köhler, P., Joos, F., Stocker, T. F., Leuenberger, M.,
and Fischer, H.: Carbon Isotope Constraints on the Deglacial CO2 Rise
from Ice Cores, Science, 336, 711–714, https://doi.org/10.1126/science.1217161, 2012.
Schmittner, A., Gruber, N., Mix, A. C., Key, R. M., Tagliabue, A., and Westberry, T. K.: Biology and air–sea gas exchange controls on the distribution of carbon isotope ratios (δ13C) in the ocean, Biogeosciences, 10, 5793–5816, https://doi.org/10.5194/bg-10-5793-2013, 2013.
Schmittner, A. and Somes, C. J.: Complementary constraints from carbon
(13C) and nitrogen (15N) isotopes on the glacial ocean's
soft-tissue biological pump, Paleoceanography, 31, 669–693,
https://doi.org/10.1002/2015PA002905, 2016.
Schwinger, J., Goris, N., Tjiputra, J. F., Kriest, I., Bentsen, M., Bethke, I., Ilicak, M., Assmann, K. M., and Heinze, C.: Evaluation of NorESM-OC (versions 1 and 1.2), the ocean carbon-cycle stand-alone configuration of the Norwegian Earth System Model (NorESM1), Geosci. Model Dev., 9, 2589–2622, https://doi.org/10.5194/gmd-9-2589-2016, 2016.
Sueyoshi, T., Ohgaito, R., Yamamoto, A., Chikamoto, M. O., Hajima, T., Okajima, H., Yoshimori, M., Abe, M., O'ishi, R., Saito, F., Watanabe, S., Kawamiya, M., and Abe-Ouchi, A.: Set-up of the PMIP3 paleoclimate experiments conducted using an Earth system model, MIROC-ESM, Geosci. Model Dev., 6, 819–836, https://doi.org/10.5194/gmd-6-819-2013, 2013
Siegenthaler, U. and Oeschger, H.: Biospheric CO2 emissions during the
past 200 years reconstructed by deconvolution of ice core data, Tellus B,
39B, 140–154, https://doi.org/10.1111/j.1600-0889.1987.tb00278.x, 1987.
Sigman, D. M. and Boyle, E. A.: Glacial/interglacial variations in
atmospheric carbon dioxide, Nature, 407, 859–869, https://doi.org/10.1038/35038000, 2000.
Sigman, D. M., Hain, M. P., and Haug, G. H.: The polar ocean and glacial
cycles in atmospheric CO2 concentration, Nature, 466, 47–55,
https://doi.org/10.1038/nature09149, 2010.
Sikes, E. L., Elmore, A. C., Allen, K. A., Cook, M. S., and Guilderson, T.
P.: Glacial water mass structure and rapid δ18O and δ13C changes during the last glacial termination in the Southwest
Pacific, Earth Planet. Sci. Lett., 456, 87–97,
https://doi.org/10.1016/j.epsl.2016.09.043, 2016.
Skinner, L. C., Primeau, F., Freeman, E., de la Fuente, M., Goodwin, P. A.,
Gottschalk, J., Huang, E., McCave, I. N., Noble, T. L., and Scrivner, A. E.: Radiocarbon constraints on the glacial ocean circulation and its impact on atmospheric CO2, Nat. Commun., 8, 16010, https://doi.org/10.1038/ncomms16010,
2017.
Spence, J. P., Eby, M., and Weaver, A. J.: The Sensitivity of the Atlantic
Meridional Overturning Circulation to Freshwater Forcing at Eddy-Permitting
Resolutions, J. Climate, 21, 2697–2710, https://doi.org/10.1175/2007JCLI2103.1,
2008.
Srokosz, M. A. and Bryden, H. L.: Observing the Atlantic Meridional
Overturning Circulation yields a decade of inevitable surprises, Science,
348, 1255575, https://doi.org/10.1126/science.1255575, 2015.
Stein, K., Timmermann, A., Kwon, E. Y., and Friedrich, T.: Timing and
magnitude of Southern Ocean sea ice/carbon cycle feedbacks, P.
Natl. Acad. Sci. USA, 117, 4498, https://doi.org/10.1073/pnas.1908670117, 2020.
Stephens, B. B. and Keeling, R. F.: The influence of Antarctic sea ice on
glacial–interglacial CO2 variations, Nature, 404, 171–174,
https://doi.org/10.1038/35004556, 2000.
Takahashi, T., Broecker, W. S., and Langer, S.: Redfield ratio based on
chemical data from isopycnal surfaces, J. Geophys. Res.-Oceans, 90, 6907–6924, https://doi.org/10.1029/JC090iC04p06907, 1985.
Tagliabue, A., Bopp, L., Roche, D. M., Bouttes, N., Dutay, J.-C., Alkama, R., Kageyama, M., Michel, E., and Paillard, D.: Quantifying the roles of ocean circulation and biogeochemistry in governing ocean carbon-13 and atmospheric carbon dioxide at the last glacial maximum, Clim. Past, 5, 695–706, https://doi.org/10.5194/cp-5-695-2009, 2009.
Tamburini, F. and Föllmi, K. B.: Phosphorus burial in the ocean over glacial-interglacial time scales, Biogeosciences, 6, 501–513, https://doi.org/10.5194/bg-6-501-2009, 2009.
Tjiputra, J. F., Roelandt, C., Bentsen, M., Lawrence, D. M., Lorentzen, T., Schwinger, J., Seland, Ø., and Heinze, C.: Evaluation of the carbon cycle components in the Norwegian Earth System Model (NorESM), Geosci. Model Dev., 6, 301–325, https://doi.org/10.5194/gmd-6-301-2013, 2013.
Tjiputra, J. F., Schwinger, J., Bentsen, M., Morée, A. L., Gao, S., Bethke, I., Heinze, C., Goris, N., Gupta, A., He, Y.-C., Olivié, D., Seland, Ø., and Schulz, M.: Ocean biogeochemistry in the Norwegian Earth System Model version 2 (NorESM2), Geosci. Model Dev., 13, 2393–2431, https://doi.org/10.5194/gmd-13-2393-2020, 2020.
Tschumi, T., Joos, F., Gehlen, M., and Heinze, C.: Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise, Clim. Past, 7, 771–800, https://doi.org/10.5194/cp-7-771-2011, 2011.
Umling, N. E., Thunell, R. C., and Bizimis, M.: Deepwater Expansion and Enhanced Remineralization in the Eastern Equatorial Pacific During the Last Glacial Maximum, Paleoceanogr. Paleoclimatol., 33, 563–578, https://doi.org/10.1029/2017PA003221, 2018.
Vecsei, A. and Berger, W. H.: Increase of atmospheric CO2 during
deglaciation: Constraints on the coral reef hypothesis from patterns of
deposition, Global Biogeochem. Cy., 18, GB1035, https://doi.org/10.1029/2003GB002147,
2004.
Volk, T. and Hoffert, M. I.: Ocean Carbon Pumps: Analysis of Relative
Strengths and Efficiencies in Ocean-Driven Atmospheric CO2 Changes, in: The Carbon Cycle and Atmospheric CO2: Natural Variations Archean to Present, edited by: Sundquist, E. and Broecker, W., American Geophysical Union (AGU), https://doi.org/10.1029/GM032p0099, 1985.
Weber, S. L., Drijfhout, S. S., Abe-Ouchi, A., Crucifix, M., Eby, M., Ganopolski, A., Murakami, S., Otto-Bliesner, B., and Peltier, W. R.: The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations, Clim. Past, 3, 51–64, https://doi.org/10.5194/cp-3-51-2007, 2007.
Winckler, G., Anderson, R. F., Jaccard, S. L., and Marcantonio, F.: Ocean
dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years, P. Natl. Acad. Sci. USA, 113, 6119, https://doi.org/10.1073/pnas.1600616113, 2016.
Winguth, A. M. E., Archer, D., Duplessy, J. C., Maier-Reimer, E., and
Mikolajewicz, U.: Sensitivity of paleonutrient tracer distributions and
deep-sea circulation to glacial boundary conditions, Paleoceanography, 14,
304–323, https://doi.org/10.1029/1999PA900002, 1999.
Yamamoto, A., Abe-Ouchi, A., Ohgaito, R., Ito, A., and Oka, A.: Glacial CO2 decrease and deep-water deoxygenation by iron fertilization from glaciogenic dust, Clim. Past, 15, 981–996, https://doi.org/10.5194/cp-15-981-2019, 2019.
Yu, J., Menviel, L., Jin, Z. D., Thornalley, D. J. R., Barker, S., Marino,
G., Rohling, E. J., Cai, Y., Zhang, F., Wang, X., Dai, Y., Chen, P., and
Broecker, W. S.: Sequestration of carbon in the deep Atlantic during the
last glaciation, Nat. Geosci., 9, 319–324, https://doi.org/10.1038/ngeo2657, 2016.
Yu, J., Menviel, L., Jin, Z. D., Thornalley, D. J. R., Foster, G. L.,
Rohling, E. J., McCave, I. N., McManus, J. F., Dai, Y., Ren, H., He, F.,
Zhang, F., Chen, P. J., and Roberts, A. P.: More efficient North Atlantic
carbon pump during the Last Glacial Maximum, Nat. Commun., 10,
2170, https://doi.org/10.1038/s41467-019-10028-z, 2019.
Zeebe, R. and Wolf-Gladrow, D.: CO2 in Seawater: Equilibrium,
Kinetics, Isotopes, Elsevier Oceanography Series, edited by: Halpern, D.,
Elsevier Science B. V., Amsterdam, The Netherlands, 346 pp., 2001.
Zhang, J., Quay, P. D., and Wilbur, D. O.: Carbon isotope fractionation
during gas-water exchange and dissolution of CO2, Geochim.
Cosmochim. Ac., 59, 107–114, https://doi.org/10.1016/0016-7037(95)91550-D, 1995.
Zhu, J., Otto-Bliesner, B. L., Brady, E. C., Poulsen, C. J., Tierney, J. E., Lofverstrom, M., and DiNezio, P.: Assessment of equilibrium climate
sensitivity of the Community Earth System Model version 2 through simulation of the Last Glacial Maximum, Geophys. Res. Lett., 48,
e2020GL091220, https://doi.org/10.1029/2020GL091220, 2021.
Ziegler, M., Diz, P., Hall, I. R., and Zahn, R.: Millennial-scale changes in atmospheric CO2 levels linked to the Southern Ocean carbon isotope
gradient and dust flux, Nat. Geosci., 6, 457, https://doi.org/10.1038/ngeo1782, 2013.
Short summary
This modeling study of the Last Glacial Maximum (LGM, ~ 21 000 years ago) ocean explores the biological and physical changes in the ocean needed to satisfy marine proxy records, with a focus on the carbon isotope 13C. We estimate that the LGM ocean may have been up to twice as efficient at sequestering carbon and nutrients at depth as compared to preindustrial times. Our work shows that both circulation and biogeochemical changes must have occurred between the LGM and preindustrial times.
This modeling study of the Last Glacial Maximum (LGM, ~ 21 000 years ago) ocean explores the...
