Articles | Volume 17, issue 1
https://doi.org/10.5194/cp-17-379-2021
© 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-17-379-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Feb 2021
Research article |
| 08 Feb 2021
| 08 Feb 2021
Response of biological productivity to North Atlantic marine front migration during the Holocene
David J. Harning
CORRESPONDING AUTHOR
Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland
Institute of Arctic and Alpine Research, University of Colorado, Boulder, USA
Department of Geological Sciences, University of Colorado, Boulder, USA
Anne E. Jennings
Institute of Arctic and Alpine Research, University of Colorado, Boulder, USA
Department of Geological Sciences, University of Colorado, Boulder, USA
Denizcan Köseoğlu
Biogeochemistry Research Centre, Plymouth University, Plymouth, UK
Simon T. Belt
Biogeochemistry Research Centre, Plymouth University, Plymouth, UK
Áslaug Geirsdóttir
Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland
Julio Sepúlveda
Institute of Arctic and Alpine Research, University of Colorado, Boulder, USA
Department of Geological Sciences, University of Colorado, Boulder, USA
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In order to better reconstruct the geologic history of the North Water Polynya, we provide modern validations and calibrations of lipid biomarker proxies in Baffin Bay. We find that sterols, rather than HBIs, most accurately capture the current extent of the North Water Polynya and will be a valuable tool to reconstruct its past presence or absence. Our local temperature calibrations for GDGTs and OH-GDGTs reduce the uncertainty present in global temperature calibrations.
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Volcanic ash layers are a common tool to synchronize records of past climate, and their estimated age relies on external dating methods. Here, we show that the chemical composition of the well-known, 12000 year-old Vedde Ash is indistinguishable with several other ash layers in Iceland that are ~1000 years younger. Therefore, chemical composition alone cannot be used to identify the Vedde Ash in sedimentary records.
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Manuscript not accepted for further review
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Jonathan H. Raberg, David J. Harning, Sarah E. Crump, Greg de Wet, Aria Blumm, Sebastian Kopf, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
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Alix G. Cage, Anna J. Pieńkowski, Anne Jennings, Karen Luise Knudsen, and Marit-Solveig Seidenkrantz
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Kelly A. Hogan, Martin Jakobsson, Larry Mayer, Brendan T. Reilly, Anne E. Jennings, Joseph S. Stoner, Tove Nielsen, Katrine J. Andresen, Egon Nørmark, Katrien A. Heirman, Elina Kamla, Kevin Jerram, Christian Stranne, and Alan Mix
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Áslaug Geirsdóttir, Gifford H. Miller, John T. Andrews, David J. Harning, Leif S. Anderson, Christopher Florian, Darren J. Larsen, and Thor Thordarson
Clim. Past, 15, 25–40, https://doi.org/10.5194/cp-15-25-2019, https://doi.org/10.5194/cp-15-25-2019, 2019
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Katrin Schmidt, Thomas A. Brown, Simon T. Belt, Louise C. Ireland, Kyle W. R. Taylor, Sally E. Thorpe, Peter Ward, and Angus Atkinson
Biogeosciences, 15, 1987–2006, https://doi.org/10.5194/bg-15-1987-2018, https://doi.org/10.5194/bg-15-1987-2018, 2018
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Sea ice cover is declining across the polar regions, but its importance for the food webs is largely unknown. We used certain diatom metabolites to trace ice-derived and ice-conditioned algae production within pelagic grazers. Our results show that zooplankton can feed on ice algae long after their release into the water column, and that the marginal ice zone can act as an important feeding ground. Predictions on future functioning of polar ecosystems need to consider such subtle relationships.
Simon L. Pendleton, Gifford H. Miller, Robert A. Anderson, Sarah E. Crump, Yafang Zhong, Alexandra Jahn, and Áslaug Geirsdottir
Clim. Past, 13, 1527–1537, https://doi.org/10.5194/cp-13-1527-2017, https://doi.org/10.5194/cp-13-1527-2017, 2017
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Subject: Ocean Dynamics | Archive: Marine Archives | Timescale: Holocene
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Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea
Post-glacial flooding of the Bering Land Bridge dated to 11 cal ka BP based on new geophysical and sediment records
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Holocene evolution of the North Atlantic subsurface transport
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Implication of methodological uncertainties for mid-Holocene sea surface temperature reconstructions
The role of the northward-directed (sub)surface limb of the Atlantic Meridional Overturning Circulation during the 8.2 ka event
Reconstruction of Atlantic water variability during the Holocene in the western Barents Sea
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A record of past sea temperature in the Indian sector of the Southern Ocean, spanning the last 14 200 years, has been developed by analysis of fossil diatoms in marine sediment. During the late deglaciation the reconstructed temperature changes were highly similar to those over Antarctica, most likely due to a reorganisation of global ocean and atmospheric circulation. During the last 11 600 years temperatures gradually cooled and became increasingly variable.
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The Labrador Sea is important for the modern global thermohaline circulation system through the formation of Labrador Sea Water. However, the role of the southward flowing Labrador Current in Labrador Sea convection is still debated. In order to better assess its role in deep-water formation and climate variability, we present high-resolution mid- to late Holocene records of sea surface and bottom water temperatures, freshening, and sea ice cover on the Labrador Shelf during the last 6000 years.
Katrine Elnegaard Hansen, Jacques Giraudeau, Lukas Wacker, Christof Pearce, and Marit-Solveig Seidenkrantz
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Joanna Pawłowska, Magdalena Łącka, Małgorzata Kucharska, Jan Pawlowski, and Marek Zajączkowski
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Raymond S. Bradley and Jostein Bakke
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We review paleoceanographic and paleoclimatic records from the northern North Atlantic to assess the nature of climatic conditions at 4.2 ka BP. There was a general decline in temperatures after ~ 5 ka BP, which led to the onset of neoglaciation. Although a few records do show a distinct anomaly around 4.2 ka BP (associated with a glacial advance), this is not widespread and we interpret it as a local manifestation of the overall climatic deterioration that characterized the late Holocene.
Albert Català, Isabel Cacho, Jaime Frigola, Leopoldo D. Pena, and Fabrizio Lirer
Clim. Past, 15, 927–942, https://doi.org/10.5194/cp-15-927-2019, https://doi.org/10.5194/cp-15-927-2019, 2019
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We present a new high-resolution sea surface temperature (SST) reconstruction for the Holocene (last 11 700 years) in the westernmost Mediterranean Sea. We identify three sub-periods: the Early Holocene with warmest SST; the Middle Holocene with a cooling trend ending at 4200 years, which is identified as a double peak cooling event that marks the transition between the Middle and Late Holocene; and the Late Holocene with very different behaviour in both long- and short-term SST variability.
Bassem Jalali, Marie-Alexandrine Sicre, Julien Azuara, Violaine Pellichero, and Nathalie Combourieu-Nebout
Clim. Past, 15, 701–711, https://doi.org/10.5194/cp-15-701-2019, https://doi.org/10.5194/cp-15-701-2019, 2019
Lauren T. Toth and Richard B. Aronson
Clim. Past, 15, 105–119, https://doi.org/10.5194/cp-15-105-2019, https://doi.org/10.5194/cp-15-105-2019, 2019
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We explore the hypothesis that a shift in global climate 4200 years ago (the 4.2 ka event) was related to the El Niño–Southern Oscillation (ENSO). We summarize records of coral reef development in the tropical eastern Pacific, where intensification of ENSO stalled reef growth for 2500 years starting around 4.2 ka. Because corals are highly sensitive to climatic changes, like ENSO, we suggest that records from coral reefs may provide important clues about the role of ENSO in the 4.2 ka event.
Alena Giesche, Michael Staubwasser, Cameron A. Petrie, and David A. Hodell
Clim. Past, 15, 73–90, https://doi.org/10.5194/cp-15-73-2019, https://doi.org/10.5194/cp-15-73-2019, 2019
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A foraminifer oxygen isotope record from the northeastern Arabian Sea was used to reconstruct winter and summer monsoon strength from 5.4 to 3.0 ka. We found a 200-year period of strengthened winter monsoon (4.5–4.3 ka) that coincides with the earliest phase of the Mature Harappan period of the Indus Civilization, followed by weakened winter and summer monsoons by 4.1 ka. Aridity spanning both rainfall seasons at 4.1 ka may help to explain some of the observed archaeological shifts.
Liviu Giosan, William D. Orsi, Marco Coolen, Cornelia Wuchter, Ann G. Dunlea, Kaustubh Thirumalai, Samuel E. Munoz, Peter D. Clift, Jeffrey P. Donnelly, Valier Galy, and Dorian Q. Fuller
Clim. Past, 14, 1669–1686, https://doi.org/10.5194/cp-14-1669-2018, https://doi.org/10.5194/cp-14-1669-2018, 2018
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Climate reorganization during the early neoglacial anomaly (ENA) may explain the Harappan civilization metamorphosis from an urban, expansive culture to a rural, geographically-confined one. Landcover change is a candidate for causing this climate instability. During ENA agriculture along the flood-deficient floodplains of the Indus became too risky, which pushed people out. In the same time the Himalayan piedmont received augmented winter rain and steady summer precipitation, pulling people in.
Martin Bartels, Jürgen Titschack, Kirsten Fahl, Rüdiger Stein, Marit-Solveig Seidenkrantz, Claude Hillaire-Marcel, and Dierk Hebbeln
Clim. Past, 13, 1717–1749, https://doi.org/10.5194/cp-13-1717-2017, https://doi.org/10.5194/cp-13-1717-2017, 2017
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Multi-proxy analyses (i.a., benthic foraminiferal assemblages and sedimentary properties) of a marine record from Woodfjorden at the northern Svalbard margin (Norwegian Arctic) illustrate a significant contribution of relatively warm Atlantic water to the destabilization of tidewater glaciers, especially during the deglaciation and early Holocene (until ~ 7800 years ago), whereas its influence on glacier activity has been fading during the last 2 millennia, enabling glacier readvances.
Masanobu Yamamoto, Seung-Il Nam, Leonid Polyak, Daisuke Kobayashi, Kenta Suzuki, Tomohisa Irino, and Koji Shimada
Clim. Past, 13, 1111–1127, https://doi.org/10.5194/cp-13-1111-2017, https://doi.org/10.5194/cp-13-1111-2017, 2017
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Based on mineral records from the northern Chukchi Sea, we report a long-term decline in the Beaufort Gyre (BG) strength during the Holocene, consistent with a decrease in summer insolation. Multi-centennial variability in BG circulation is consistent with fluctuations in solar irradiance. The Bering Strait inflow shows intensification during the middle Holocene, associated with sea-ice retreat and an increase in marine production in the Chukchi Sea, which is attributed to a weaker Aleutian Low.
Martin Jakobsson, Christof Pearce, Thomas M. Cronin, Jan Backman, Leif G. Anderson, Natalia Barrientos, Göran Björk, Helen Coxall, Agatha de Boer, Larry A. Mayer, Carl-Magnus Mörth, Johan Nilsson, Jayne E. Rattray, Christian Stranne, Igor Semiletov, and Matt O'Regan
Clim. Past, 13, 991–1005, https://doi.org/10.5194/cp-13-991-2017, https://doi.org/10.5194/cp-13-991-2017, 2017
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The Arctic and Pacific oceans are connected by the presently ~53 m deep Bering Strait. During the last glacial period when the sea level was lower than today, the Bering Strait was exposed. Humans and animals could then migrate between Asia and North America across the formed land bridge. From analyses of sediment cores and geophysical mapping data from Herald Canyon north of the Bering Strait, we show that the land bridge was flooded about 11 000 years ago.
Annette Hahn, Enno Schefuß, Sergio Andò, Hayley C. Cawthra, Peter Frenzel, Martin Kugel, Stephanie Meschner, Gesine Mollenhauer, and Matthias Zabel
Clim. Past, 13, 649–665, https://doi.org/10.5194/cp-13-649-2017, https://doi.org/10.5194/cp-13-649-2017, 2017
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Our study demonstrates that a source to sink analysis in the Gouritz catchment can be used to obtain valuable paleoclimatic information form the year-round rainfall zone. In combination with SST reconstructions these data are a valuable contribution to the discussion of Southern Hemisphere palaeoenvironments and climate variability (in particular atmosphere–ocean circulation and hydroclimate change) in the South African Holocene.
Janne Repschläger, Dieter Garbe-Schönberg, Mara Weinelt, and Ralph Schneider
Clim. Past, 13, 333–344, https://doi.org/10.5194/cp-13-333-2017, https://doi.org/10.5194/cp-13-333-2017, 2017
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We reconstruct changes in the warm water transport from the subtropical to the subpolar North Atlantic over the last 10 000 years. We use stable isotope and Mg / Ca ratios measured on surface and subsurface dwelling foraminifera. Results indicate an overall stable warm water transport at surface. The northward transport at subsurface evolves stepwise and stabilizes at 7 ka BP on the modern mode. These ocean transport changes seem to be controlled by the meltwater inflow into the North Atlantic.
Yannick Mary, Frédérique Eynaud, Christophe Colin, Linda Rossignol, Sandra Brocheray, Meryem Mojtahid, Jennifer Garcia, Marion Peral, Hélène Howa, Sébastien Zaragosi, and Michel Cremer
Clim. Past, 13, 201–216, https://doi.org/10.5194/cp-13-201-2017, https://doi.org/10.5194/cp-13-201-2017, 2017
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In the boreal Atlantic, the subpolar and subtropical gyres (SPG and STG respectively) are key elements of the Atlantic Meridional Overturning Circulation (AMOC) cell and contribute to climate modulations over Europe. Here we document the last 10 kyr evolution of sea-surface temperatures over the North Atlantic with a focus on new data obtained from an exceptional sedimentary archive retrieved the southern Bay of Biscay, enabling the study of Holocene archives at (infra)centennial scales.
Quentin Dubois-Dauphin, Paolo Montagna, Giuseppe Siani, Eric Douville, Claudia Wienberg, Dierk Hebbeln, Zhifei Liu, Nejib Kallel, Arnaud Dapoigny, Marie Revel, Edwige Pons-Branchu, Marco Taviani, and Christophe Colin
Clim. Past, 13, 17–37, https://doi.org/10.5194/cp-13-17-2017, https://doi.org/10.5194/cp-13-17-2017, 2017
Mercè Cisneros, Isabel Cacho, Jaime Frigola, Miquel Canals, Pere Masqué, Belen Martrat, Marta Casado, Joan O. Grimalt, Leopoldo D. Pena, Giulia Margaritelli, and Fabrizio Lirer
Clim. Past, 12, 849–869, https://doi.org/10.5194/cp-12-849-2016, https://doi.org/10.5194/cp-12-849-2016, 2016
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We present a high-resolution multi-proxy study about the evolution of sea surface conditions along the last 2700 yr in the north-western Mediterranean Sea based on five sediment records from two different sites north of Minorca. The novelty of the results and the followed approach, constructing stack records from the studied proxies to preserve the most robust patterns, provides a special value to the study. This complex period appears to have significant regional changes in the climatic signal.
C. Consolaro, T. L. Rasmussen, G. Panieri, J. Mienert, S. Bünz, and K. Sztybor
Clim. Past, 11, 669–685, https://doi.org/10.5194/cp-11-669-2015, https://doi.org/10.5194/cp-11-669-2015, 2015
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A sediment core collected from a pockmark field on the Vestnesa Ridge (~80N) in the Fram Strait is presented. Our results show an undisturbed sedimentary record for the last 14 ka BP and negative carbon isotope excursions (CIEs) during the Bølling-Allerød interstadials and during the early Holocene. Both CIEs relate to periods of ocean warming, sea-level rise and increased concentrations of methane (CH4) in the atmosphere, suggesting an apparent correlation with warm climatic events.
M. Łącka, M. Zajączkowski, M. Forwick, and W. Szczuciński
Clim. Past, 11, 587–603, https://doi.org/10.5194/cp-11-587-2015, https://doi.org/10.5194/cp-11-587-2015, 2015
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Storfjordrenna was deglaciated about 13,950 cal yr BP. During the transition from the sub-glacial to glaciomarine setting, Arctic Waters dominated its hydrography. However, the waters were not uniformly cold and experienced several warmer spells. Atlantic Water began to flow onto the shelves off Svalbard and into Storfjorden during the early Holocene, leading to progressive warming and significant glacial melting. A surface-water cooling and freshening occurred in late Holocene.
I. Hessler, S. P. Harrison, M. Kucera, C. Waelbroeck, M.-T. Chen, C. Anderson, A. de Vernal, B. Fréchette, A. Cloke-Hayes, G. Leduc, and L. Londeix
Clim. Past, 10, 2237–2252, https://doi.org/10.5194/cp-10-2237-2014, https://doi.org/10.5194/cp-10-2237-2014, 2014
A. D. Tegzes, E. Jansen, and R. J. Telford
Clim. Past, 10, 1887–1904, https://doi.org/10.5194/cp-10-1887-2014, https://doi.org/10.5194/cp-10-1887-2014, 2014
D. E. Groot, S. Aagaard-Sørensen, and K. Husum
Clim. Past, 10, 51–62, https://doi.org/10.5194/cp-10-51-2014, https://doi.org/10.5194/cp-10-51-2014, 2014
C. V. Dylmer, J. Giraudeau, F. Eynaud, K. Husum, and A. De Vernal
Clim. Past, 9, 1505–1518, https://doi.org/10.5194/cp-9-1505-2013, https://doi.org/10.5194/cp-9-1505-2013, 2013
C. Giry, T. Felis, M. Kölling, W. Wei, G. Lohmann, and S. Scheffers
Clim. Past, 9, 841–858, https://doi.org/10.5194/cp-9-841-2013, https://doi.org/10.5194/cp-9-841-2013, 2013
G. Siani, M. Magny, M. Paterne, M. Debret, and M. Fontugne
Clim. Past, 9, 499–515, https://doi.org/10.5194/cp-9-499-2013, https://doi.org/10.5194/cp-9-499-2013, 2013
Cited articles
Andersen, C., Koç, N., Jennings, A. E., and Andrews, J. T.: Nonuniform
response of the major surface currents in the Nordic Seas to insolation
forcing: Implications for the Holocene climate variability,
Paleoceanography, 19, 1–16, 2004.
Anderson, L. S., Flowers, G. E., Jarosch, A. H., Aðalgeirsdóttir, G.Th., Geirsdóttir, Á., Miller, G. H., Harning, D. J., Thorsteinsson, T., Magnússon, E., and Pálsson, F.: Holocene glacier and climate
variations in Vestfirðir, Iceland, from the modeling of Drangajökull
ice cap, Quaternary Sci. Rev., 190, 39–56, 2018.
Anderson, L. S., Geirsdóttir, Á., Flowers, G. E., Wickert, A. D.,
Aðalgeirsdóttir, G., and Thorsteinsson, Th.: Controls on the
lifespans of Icelandic ice caps, Earth Planet. Sc. Lett., 527, 115780, https://doi.org/10.1016/j.epsl.2019.115780, 2019.
Árnason, R. and Sigfússon, Þ.: Þýðing
sjávarklasans í íslensku efnahagslífi, published by
Islandsbanki, Reykjavík, Iceland, 2012.
Bakker, P., Schmittner, A., Lenaerts, J. T. M., Abe-Ouchi, A., Bi, D., van
den Broeke, M. R., Chan, W.-L, Hu, A., Beadling, R. L., Marsland, S. J.,
Mernild, S. H., Saenko, O. A., Swingedouw, D., Sullivan, A., and Yin, J.: Fate
of the Atlantic meridional overturning circulation: strong decline under
continued warming and Greenland melting, Geophys. Res. Lett., 43,
12252–12260, 2016.
Belkin, I. M.: Propagation of the “Great Salinity Anomaly” of the 1990s
around the northern North Atlantic, Geophys. Res. Lett., 31, L08306, https://doi.org/10.1029/2003GL019334, 2004.
Belkin, I. M., Cornillon, P. C., and Sherman, K.: Fronts in Large Marine
Ecosystems, Prog. Oceangr., 81, 223–236, 2009.
Belt, S. T.: Source-specific biomarkers as proxies for Arctic and Antarctic
sea ice, Org. Geochem., 125, 277–298, 2018.
Belt, S. T., Allard, W. G., Massé, G., Robert, J.-M., and Rowland, S. J.: Highly branched isoprenoids (HBIs): Identification of the most common
and abundant sedimentary isomers, Geochim. Cosmochim. Ac., 64, 3839–3851, 2000.
Belt, S. T., Cabedo-Sanz, P., Smik, L., Rodriguez-Navarro, A., Berben, S. M. P., Knies, J., and Husum, K.: Identification of paleo Arctic winter sea
ice limits and the marginal ice zone: Optimised biomarker-based
reconstructions of late Quaternary Arctic sea ice, Earth Planet. Sc. Lett.,
431, 127–139, 2015.
Belt, S. T., Brown, T. A., Smik, L., Tatarek, A., Wiktor, J., Stowasser, G.,
Assmy, P., Allen, C. S., and Husum, K.: Identification of C25 highly
branched isoprenoid (HBI) alkenes in diatoms of the genus Rhizosolenia in polar and
sub-polar marine phytoplankton, Org. Geochem., 110, 65–72, 2017.
Belt, S. T., Smik, L., Köseoğlu, D., Knies, J., and Husum, K.: A
novel biomarker-based proxy for the spring phytoplankton bloom in Arctic and
sub-arctic settings – HBI T25, Earth Planet. Sc. Lett., 523, 115703, https://doi.org/10.1016/j.epsl.2019.06.038, 2019.
Bendle, J. A. P. and Rosell-Melé, A.: High-resolution alkenone sea
surface temperature variability on the North Icelandic Shelf: implications
for Nordic Seas palaeoclimatic development during the Holocene, Holocene,
17, 9–24, 2007.
Berger, A. and Loutre, M. F.: Insolation values for the climate of the last
10 million years, Quaternary Sci. Rev., 10, 297–317, 1991.
Bianchi, G. G. and McCave, I. N.: Holocene periodicity in North Atlantic
climate and deep-ocean flow south of Iceland, Nature, 397, 515–517, 1999.
Blaga, C. I., Reichart, G.-J., Heiri, O., and Sinninghe Damsté, J. S.: Tetraether membrane lipid distribution in water- column particulate
matter and sediments: A study from 47 European lakes along a north-south
transect, J. Paleolimnol., 41, 535–540, 2009.
Brassell, S. C., Eglington, G., Marlowe, I. T., Pflaumann, U., and Sarnthein, M.: Molecular stratigraphy: a new tool for climatic assessment, Nature, 320,
129–133, 1986.
Brown, T. A., Belt, S. T., Tatarek, A., and Mundy, C. J.: Source identification
of the Arctic sea ice proxy IP25, Nat. Commun. 5, 1–7, 2014.
Buckley, M. W. and Marshall, J.: Observations, inferences, and mechanisms of
the Atlantic Meridional Overturning Circulation: A review, Rev. Geophys.,
54, 5–63, 2015.
Cabedo-Sanz, P., Belt, S. T., Jennings, A. E., Andrews, J. T., and
Geirsdóttir, Á.: Variability in drift ice export from the Arctic
Ocean to the North Icelandic Shelf over the last 8000 years: A multi-proxy
evaluation, Quaternary Sci. Rev., 146, 99–115, 2016.
Davoren, G. K., Montevecchi, W. A., and Anderson, J. T.: Distributional
patterns of a marine bird and its prey: habitat selection based on prey and
conspecific behaviour, Mar. Ecol. Prog. Ser., 256, 229–242, 2003.
Duffield, C. J., Hess, S., Norling, K., and Alve, E.: The response of
Nonionella iridea and other benthic foraminifera to “fresh” organic matter enrichment and
physical disturbance, Mar. Micropaleontol., 120, 20–30, 2015.
Eiríksson, J., Knudsen, K. L., Haflidason, H., and Henriksen, P.:
Late-glacial and Holocene palaeoceanography of the North Icelandic Shelf, J.
Quaternary Sci., 15, 23–42, 2000.
Eiríksson, J., Larsen, G., Knudsen, K. L., Heinemeier, J., and
Símonarson, L. A.: Marine reservoir age variability and water mass
distribution in the Iceland Sea, Quaternary Sci. Rev., 23, 2247–2268, 2004.
Geirsdóttir, Á., Miller, G. H., Andrews, J. T., Harning, D. J., Anderson, L. S., Florian, C., Larsen, D. J., and Thordarson, T.: The onset of neoglaciation in Iceland and the 4.2 ka event, Clim. Past, 15, 25–40, https://doi.org/10.5194/cp-15-25-2019, 2019.
Giraudeau, J., Jennings, A. E., and Andrews, J. T.: Timing and mechanisms of
surface and intermediate water circulation changes in the Nordic Sea over
the last 10000 cal years: A view from the North Iceland Shelf, Quaternary Sci.
Rev., 23, 2127–2139, 2004.
Gooday, A. J. and Hughes, J. A.: Foraminifera associated with phytodetritus
deposits at the bathyal site in the northern Rockall Trough (NE Atlantic):
seasonal contrasts and a comparison of stained and dead assemblages, Mar.
Micropaleontol., 46, 83–110, 2002.
Hald, M., Andersson, C., Ebbesen, H., Jansen, E., Klitgaard-Kristensen, D.,
Risebrobakken, B., Salomonsen, G. R., Sarnthein, M., Sejrup, H. P., and Telford, R. J.: Variations in temperature and extent of Atlantic Water in the
northern North Atlantic during the Holocene, Quaternary Sci. Rev., 26, 3423–3440, 2007.
Hall, I. R., Bianchi, G. G., and Evans, J. R.: Centennial to millennial scale
Holocene climate-deep water linkage in the North Atlantic, Quaternary Sci. Rev.,
23, 1529–1536, 2004.
Hanna, E., Jónsson, T., Ólafsson, J., and Valdimarsson, H.:
Icelandic coastal sea surface temperature records constructed: putting the
pulse on air-sea-climate interactions in the northern North Atlantic. Part
I: Comparison with HadISST1 open-ocean surface temperatures and preliminary
analysis of long-term patterns and anomalies of SSTs around Iceland, J.
Climate, 19, 5652–5666, 2006.
Harning, D. J., Geirsdóttir, Á., Miller, G. H., and Anderson, L. S.:
Episodic expansion of Drangajökull, Vestfirðir, Iceland over the
last 3 ka culminating in its maximum dimension during the Little Ice Age,
Quaternary Sci. Rev., 152, 118–131, 2016.
Harning, D. J., Geirsdóttir, Á., and Miller, G. H.: Punctuated
Holocene climate of Vestfirðir, Iceland, linked to internal/external
variables and oceanographic conditions, Quaternary Sci. Rev., 189, 31–42, 2018.
Harning, D. J., Andrews, J. T., Belt, S. T., Cabedo-Sanz, P., Geirsdóttir,
Á., Dildar, N., Miller, G. H., and Sepúlveda, J.: Sea ice control on
winter subsurface temperatures of the North Iceland Shelf during the Little
Ice Age: A TEX86 calibration case study, Paleoceanogr.
Paleoclimatol., 34, 1006–2021, 2019.
Harning, D. J., Curtin, L., Geirsdóttir, Á., D'Andrea, W. J., Miller, G. H., and Sepúlveda, J.: Lipid biomarkers quantify Holocene summer
temperature and ice cap sensitivity in Icelandic lakes. Geophys. Res. Lett.,
47, e2019GL085728, https://doi.org/10.1029/2019GL085728, 2020.
Heron-Allen, E. and Earland, A.: Some new Foraminifera from the South
Atlantic. IV. Four new genera from South Georgia, J. Royal Microscopial
Soc., 52, 253–261, 1932.
Huguet, C., Hopmans, E. C., Febo-Ayala, W., Thompson, D. H., Sinninghe
Damsté, J. S., and Schouten, S.: An improved method to determine the
absolute abundance of glycerol dibiphytanyl glycerol tetraether lipids, Org.
Geochem., 37, 1036–1041, 2006.
Hurley, S. J., Elling, F. J., Könneke, M., Buchwald, C., Wankel, S. D.,
Santoro, A. E., Lipp, J. S., Hinrichs, K.-U., and Pearson, A.: Influence of
ammonia oxidation rate on thaumarchaeal lipid composition and the TEX86
temperature proxy, P. Natl Acad. Sci., 113, 7762–7767, 2016.
Hurrell, J. W., Kushiner, Y., Ottersen, G., and Visbeck, M.: An Overview of
the North Atlantic Oscillation, American Geophysical Union, Washington, DC, USA, 2003.
Jennings, A. E., Hagen, S., Hardardóttir, J., Stein, R., Ogilvie, A. E. J.,
and Jonsdóttir, I.: Oceanographic change and terrestrial human impacts
in a post A. D. 1400 sediment record from the southwest Iceland shelf, Climatic
Change, 48, 83–100, 2001.
Jennings, A. E., Knudsen, K. L., Hald, M., Hansen, C. V., and Andrews, J. T.:
A mid-Holocene shift in Arctic sea-ice variability on the East
Greenland Shelf, Holocene, 12, 49–58, 2002.
Jennings, A. E., Weiner, N. J., Helgadóttir, G., and Andrews, J. T.: Modern
foraminiferal faunas of the southwestern to northern Iceland Shelf:
oceanographic and environmental controls, J. Foramin. Res., 34, 180–207, 2004.
Jiang, H., Muscheler, R., Björck, S., Seidenkrantz, M.-S., Olsen, J.,
Sha, L., Sjolte, J., Eiríksson, J., Ran., L., Knudsen, K.-L., and
Knudsen, M. F.: Solar forcing of Holocene summer sea-surface temperatures in
the northern North Atlantic, Geology, 43, 2–5, 2015.
Johannessen, T., Jansen, E., Flatøy, A., and Ravelo, A. C.: The
Relationship between Surface Water Masses, Oceanographic Fronts and
Paleoclimatic Proxies in Surface Sediments of the Greenland, Iceland,
Norwegian Seas, Carbon Cycling in the Glacial Ocean: Constraints on the
Ocean's Role in Global Change, edited by: Zahn, R., Pedersen, T. F., Kaminski, M. A., and Labeyrie, L., NATO ASI Series (Series I: Global Environmental Change), vol 17, Springer, Berlin, Heidelberg, Germany, https://doi.org/10.1007/978-3-642-78737-9_4, 1994.
Jónsson, S. and Valdimarsson, H.: Water mass transport variability to
the North Iceland Shelf, 1994–2010, ICES J. Mar. Sci., 69, 809–815, 2012.
Justwan, A., Koc, N., and Jennings, A. E.: Evolution of the Irminger and East
Icelandic Current systems through the Holocene, revealed by diatom-based sea
surface temperature reconstructions, Quaternary Sci. Rev., 27, 1571–1582, 2008.
Kim, J.-H., van der Meer, J., Schouten, S., Helmke, P., Willmott, V.,
Sangiorgi, F., Koc, N., Hopmans, E. C., and Sinninghe Damsté, J. S.: New
indices and calibrations derived from the distribution of crenarchaeal
isoprenoid tetraether lipids: Implications for past sea surface temperature
reconstructions, Geochim. Cosmochim. Ac., 74, 4639–4653, 2010.
Knudsen, K. L., Jiang, H., Jansen, E., Eiríksson, J., Heinemeier, J.,
and Seidenkrantz, M. S.: Environmental changes off North Iceland during the
deglaciation and the Holocene: foraminifera, diatoms and stable isotopes,
Mar. Micropaleontol., 50, 273–305, 2004.
Koç Karpuz, N. and Schrader, H.: Surface sediment diatom distribution
and Holocene paleotemperature variations in the Greenland, Iceland and
Norwegian Sea, Paleoceanography, 5, 557–580,1990.
Kolling, H. M., Stein, R., Fahl, K., Sadatzki, H., de Vernal, A., and Xiao, X.: Biomarker distributions in (sub)-Arctic surface sediments and their
potential for sea-ice reconstructions, Geochem. Geophy. Geosy., 21,
e2019GC008629, https://doi.org/10.1029/2019GC008629, 2020.
Könneke, M., Bernhard, A. E., de la Torre, J. R., Walker, C. B., Waterbury, J. B., and Stahl, D. A.: Isolation of an autotrophic ammonia-oxidizing marine
archaeon, Nature, 437, 543–546, 2005.
Kristjánsdóttir, G. B., Moros, M., Andrews, J. T., and Jennings, A. E.:
Holocene Mg/Ca, alkenones, and light stable isotope measurements on the
outer North Iceland shelf (MD99–2269): A comparison with other multi-proxy
data and sub-division of the Holocene, Holocene, 26, 55–62, 2017.
Malmberg, S.-A. and Jonsson, S.: Timing of deep convection in the
Greenland and Iceland Seas, ICES J. Mar. Sci., 54, 300–309, 1997.
Minobe, S., Kuwano-Yoshida, A., Komori, N., Xie, S.-P., and Small, R. J.:
Influence of the Gulf Stream on the troposphere, Nature, 452, 206–209,
2008.
Moffa-Sánchez, P. and Hall, I. R.: North Atlantic variability and its
links to European climate over the last 3000 years, Nat. Commun., 8, 1–9,
2017.
Moossen, H., Bendle, J., Seki, O., Quillmann, U., and Kawamura, K.: North
Atlantic Holocene climate evolution recorded by high-resolution terrestrial
and marine biomarker records, Quaternary Sci. Rev., 129, 111–127, 2015.
Moros, M., Andrews, J. T., Eberl, D. D., and Jansen, E.: Holocene history of
drift ice in the northern North Atlantic: Evidence for differential spatial
and temporal modes, Paleoceanography, 21, 1–10, 2006.
Müller, P. J., Kirst, G., Ruhland, G., von Storch, I., and
Rosell-Melé, A.: Calibration of the alkenone paleotemperature index
Oksman, M., Juggins, S., Miettinen, A., Witkowski, A., and Weckström, K.: The biogeography and ecology of common diatom species in the northern
North Atlantic, and their implications for paleoceanographic
reconstructions, Mar. Micropaleontol., 148, 1–28, 2019.
Ólafsdóttir, A. H. and Rose, G. A.: Influences of temperature,
bathymetry and fronts on spawning migration routes of Icelandic capelin
(Mallotus villosus), Fish. Oceanogr., 21, 182–198, 2012.
Ólafsson, J.: Connections between oceanic conditions off N-Iceland, Lake
Mývatn temperature, regional wind direction variability and the North
Atlantic oscillation, Rit Fiskideildar, 16, 41–57, 1999.
Olsen, J., Anderson, N. J., and Knudsen, M. F.: Variability of the North
Atlantic Oscillation over the past 5,200 years, Nat. Geosci., 5, 1–14, 2012.
Oppo, D. W., McManus, J. F., and Cullen, J. L.: Deepwater variability in the
Holocene epoch, Nature, 422, 277–278, 2003.
Orme, L. C., Miettinen, A., Divine, D., Husum, K., Pearce, C., Van
Nieuwenhove, N., Born, A., Mohan, R., and Seidenkrantz, M.-S.: Subpolar
North Atlantic sea surface temperature since 6 ka BP: Indications of
anomalous ocean-atmosphere interactions at 4–2 ka BP, Quaternary Sci. Rev., 194,
128–142, 2018.
Pados, T. and Spielhagen, R. F.: Species distribution and depth habitat of
recent planktic foraminifera in Fram Strait, Arctic Ocean, Polar Res., 33,
1–12, 2014.
Perner, K., Moros, M., Jansen, E., Kuijpers, A., Troelstra, S. R., and Prins, M. A.: Subarctic Front migration at the Reykjanes Ridge during the mid-
to late Holocene: Evidence from planktic foraminifera, Boreas, 47, 175–188, 2018.
Perner, K., Moros, M., Otterå, O. H., Blanz, T., Schneider, R. R., and
Jansen, E.: An oceanic perspective on Greenland's recent freshwater
discharge since 1850, Sci. Rep.-UK, 9, 1–10, 2019.
Pflaumann, U., Sarnthein, M., Chapman, M., d'Abreu, L., Funnell, B., Huels, M., Kiefer, M., Maslin, M., Schulz, H., Swallow, J., van Kreveld, S.,
Vautravers, M., Vogelsang, E., and Weinelt, M.: Glacial North Atlantic:
sea-surface conditions reconstructed by GLAMAP 2000, Paleoceanogr.
Paleoclimatol., 18, 1065, https://doi.org/10.1029/2002PA000774, 2003.
Piatt, J. F. and Methven, D. A.: Threshold foraging behaviour of baleen
whales, Mar. Ecol. Prog. Ser., 84, 205–210, 1992.
Prahl, F. G. and Wakeham, S. G.: Calibration of unsaturation in long-chain
ketone compositions for palaeotemperature assessment, Nature, 330, 533–537,
1987.
Rahmstorf, S., Box, J. E., Feulner, G., Mann, M. E., Robinson, A., Rutherford, S., and Schaffernicht, E. J.: Exceptional twentieth-century slowdown in
Atlantic Ocean overturning circulation, Nat. Clim. Change, 5, 475–480, 2015.
Risebrobakken, B., Moros, M., Ivanova, E. V., Chistyakova, N., and Rosenberg, R., 2010: Climate and oceanographic variability in the SW Barents Sea during
the Holocene, Holocene, 20, 609–621.
Rodionov, S. N.: A sequential algorithm for testing climate regime shifts,
Geophys. Res. Lett., 31, L09204, https://doi.org/10.1029/2004GL019448, 2004.
Rodionov, S. N.: Use of prewhitening in climate regime shift detection,
Geophys. Res. Lett., 33, 1–4, 2006.
Rosell-Melé, A., Eglinton, G., Pflaumann, U., and Sarnthein, M.: Atlantic core-top calibration of the UK37 index as a sea-surface
palaeotemperature indicator, Geochim. Cosmochim. Ac., 59, 3099–107, 1995.
Rowland, S. J., Allard, W. G., Belt, S. T., Massé, G., Robert, J. M.,
Blackburn, S., Frampton, D., Revill, A. T., and Volkman, J. K.: Factors
influencing the distributions of polyunsaturated terpenoids in the diatom,
Rhizosolenia setigera, Phytochemistry, 58, 717–728, 2001.
Rytter, F., Knudsen, K. L., Seidenkrantz, M.-S., and
Eiríksson, J.: Modern distribution of benthic foraminifera on the North
Iceland shelf and slope, J. Foramin. Res., 32, 217–244, 2002.
Schlitzer, R.: Ocean Data View, available at: http://odv.awi.de, last access: 1 September 2020.
Schouten, S., Hopmans, E. C., and Sinninghe Damsté, J. S.: The organic
geochemistry of glycerol dialkyl glycerol tetraether lipids: A review, Org.
Geochem., 54, 19–61, 2013.
Seddon, A. W. R., Froyd, C. A., Witkowski, A., and Willis, K. J.: A quantitative
framework for analysis of regime shifts in a Galápagos coastal lagoon,
Ecology, 95, 3046–3055, 2014.
Sejrup, H. P., Birks, H. J. B., Kristensen, D. K., and Madsen, H.: Benthonic
foraminiferal distributions and quantitative transfer functions for the
northwest European continental margin, Mar. Micropaleontol., 53, 197–226,
2004.
Semper, S., Våge, K., Pickart, R. S., Valdimarsson, H., Torres, D. J., and
Jónsson, S.: The emergence of the North Icelandic Jet and its
evolution from Northeast Iceland to Denmark Strait, J. Phys. Oceanogr., 49,
2499–2521, 2019.
Semper, S., Pickart, R. S., Våge, K., Larsen, K. M. H., Hátún, H.,
and Hansen, B.: The Iceland-Faroe Slope Jet: a conduit for dense water
toward the Faroe Bank Channel overlow, Nat. Commun., 11, 1–10, 2020.
Simon, M. H., Muschitiello, F., Tisserand, A. A., Olsen, A., Moros, M.,
Perner, K., Bardsnes, S. T., Dokken,T.M., and Jansen, E.: A multi-decadal
record of oceanographic changes of the past ∼165 years
(1850–2015 AD) from Northwest of Iceland, PLoS ONE, 15, e0239373, https://doi.org/10.1371/journal.pone.0239373, 2020.
Small, R. J., deSzoeke, S. P., Xie, S. P., O'Neill, L., Seo, H., Song, Q.,
Cornillon, P., Spall, M., and Minobe, S.: Air–sea interaction over ocean
fronts and eddies, Dynam. Atmos. Ocean., 45, 274–319, 2008.
Solignac, S., Giraudeau, J., and de Vernal, A.: Holocene sea surface
conditions in the western North Atlantic: Spatial and temporal
heterogeneities, Paleoceanography, 21, 1–6, 2006.
Stefánsson, U.: North Icelandic Waters, Rit Fiskideildar, Atvinnudeild Haskolans, Reykjavik, Iceland, 3, 1–265, 1962.
Stefánsson, U. and Ólafsson, J.: Nutrients and fertility of
Icelandic waters, Rit fiskideildar, Marine Research Insitute, Reykjavik, Iceland, 1–56, 1991.
Stoner, J. S., Jennings, A., Kristjánsdóttir, G. B., Dunhill, G., Andrews, J. T., and Hardardóttir, J.: A
paleomagnetic approach toward refining Holocene radiocarbon-based
chronologies: Paleoceanographic records from the north Iceland (MD99-2269)
and east Greenland (MD99-2322) margins, Paleoceanography, 22, 1–23, 2007.
Swift, J. H. and Aagaard, K.: Seasonal transitions and water mass formation
in the Iceland and Greenland seas, Deep-Sea Res., 28A, 1107–1129, 1981.
Thordardóttir, T.: Primary production north of Iceland in relation to
water masses in May–June 1970–1989, International Council for the Exploration of the Sea CM 1984/L:20, 17 pp., 1984.
Thornalley, D. J. R., Elderfield, H., and McCave, I. N.: Holocene oscillations
in temperature and salinity of the surface subpolar North Atlantic, Nature,
457, 711–714, 2009.
Thornalley, D. J. R., Blaschek, M., Davies, F. J., Praetorius, S., Oppo, D. W., McManus, J. F., Hall, I. R., Kleiven, H., Renssen, H., and McCave, I. N.: Long-term variations in Iceland–Scotland overflow strength during the Holocene, Clim. Past, 9, 2073–2084, https://doi.org/10.5194/cp-9-2073-2013, 2013.
Våge, K., Pickart, R. S., Spall, M. A., Valdimarsson, H., Jónsson, S., Torres, D. J., Østerhus, S., and Eldevik, T.: Significant role of the
North Icelandic Jet in the formation of Denmark Strait overflow water, Nat.
Geosci., 4, 723–727, 2011.
Våge, K., Pickart, R. S., Spall, M. A., Moore, G. W. K., Valdimarsson, H.,
Torres, D. J., Erofeeva, S. Y., and Nilsen, J. E.Ø.: Revised
circulation scheme north of the Denmark Strait, Deep-Sea Res. Pt. I, 79, 20–39, 2013.
Vilhjálmsson, H.: Capelin (Mallotus villosus) in the Ice-land–East Greenland–Jan Mayen
ecosystem, ICES J. Mar. Sci., 59, 870–883, 2002.
Volkmann, R.: Planktic foraminifers in the outer Laptev Sea and the Fram
Strait – modern distribution and ecology, J. Foramin. Res., 30, 157–176,
2000.
Walker, M., Head, M. J., Lowe, J., Berkelhammer, M., Björck, S., Cheng, H., Cwynar, L. C., Fisher, D., Gkinis, V., Long, A., Newnham, R., Rasmussen, S. O., and Weiss, H.: Subdividing the Holocene Series/Epoch: formalization of
stages/ages and subseries/subepochs, and designation of GSSPs and auxiliary
stratotypes, J. Quaternary Sci., 34, 173–186, 2019.
Zhai, L., Gudmundsson, K., Miller, P., Peng, W., Guðfinnsson, H.,
Debes, H., Hátún, H., White III, G. N., Hernández Walls, R.,
Sathyendranath, S., and Platt, T.: Phytoplankton phenology and production
around Iceland and Faroes, Cont. Shelf Res., 37, 15– 25, 2012.
Short summary
Today, the waters north of Iceland are characterized by high productivity that supports a diverse food web. However, it is not known how this may change and impact Iceland's economy with future climate change. Therefore, we explored how the local productivity has changed in the past 8000 years through fossil and biogeochemical indicators preserved in Icelandic marine mud. We show that this productivity relies on the mixing of Atlantic and Arctic waters, which migrate north under warming.
Today, the waters north of Iceland are characterized by high productivity that supports a...
