Articles | Volume 19, issue 5
https://doi.org/10.5194/cp-19-1043-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/cp-19-1043-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 May 2023
Research article |
| 30 May 2023
| 30 May 2023
Refining data–data and data–model vegetation comparisons using the Earth mover's distance (EMD)
Institute of Geosciences, Sect. Meteorology, Rheinische
Friedrich-Wilhelms-Universität Bonn, Germany
Institute of Earth Surface Dynamics, Géopolis, University of Lausanne, Lausanne, Switzerland
Anne Dallmeyer
Max Planck Institute for Meteorology, Bundesstraße 53, 20146 Hamburg, Germany
Nils Weitzel
Department of Geosciences, University of Tübingen, Schnarrenbergstr. 94–96, 72076 Tübingen, Germany
Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
Chenzhi Li
Polar Terrestrial Environmental Systems, Alfred Wegener Institute
Helmholtz Centre for Polar and Marine Research, Telegrafenberg A45, 14473
Potsdam, Germany
Institute of Environmental Science and Geography, University of Potsdam, Karl-Liebknecht-Str. 24–25, 14476 Potsdam, Germany
Jean-Philippe Baudouin
Department of Geosciences, University of Tübingen, Schnarrenbergstr. 94–96, 72076 Tübingen, Germany
Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
Ulrike Herzschuh
Polar Terrestrial Environmental Systems, Alfred Wegener Institute
Helmholtz Centre for Polar and Marine Research, Telegrafenberg A45, 14473
Potsdam, Germany
Institute of Environmental Science and Geography, University of Potsdam, Karl-Liebknecht-Str. 24–25, 14476 Potsdam, Germany
Institute of Biochemistry and Biology, University of Potsdam,
Karl-Liebknecht-Str. 24–25, 14476 Potsdam, Germany
Xianyong Cao
Alpine Paleoecology and Human Adaptation Group (ALPHA), State Key
Laboratory of Tibetan Plateau Earth System, Resources and Environment
(TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101 Beijing, China
Andreas Hense
Institute of Geosciences, Sect. Meteorology, Rheinische
Friedrich-Wilhelms-Universität Bonn, Germany
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Philip Meister, Anne Alexandre, Hannah Bailey, Philip Barker, Boris K. Biskaborn, Ellie Broadman, Rosine Cartier, Bernhard Chapligin, Martine Couapel, Jonathan R. Dean, Bernhard Diekmann, Poppy Harding, Andrew C. G. Henderson, Armand Hernandez, Ulrike Herzschuh, Svetlana S. Kostrova, Jack Lacey, Melanie J. Leng, Andreas Lücke, Anson W. Mackay, Eniko Katalin Magyari, Biljana Narancic, Cécile Porchier, Gunhild Rosqvist, Aldo Shemesh, Corinne Sonzogni, George E. A. Swann, Florence Sylvestre, and Hanno Meyer
Clim. Past, 20, 363–392, https://doi.org/10.5194/cp-20-363-2024, https://doi.org/10.5194/cp-20-363-2024, 2024
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Xiaohuan Hou, Nannan Wang, Zhe Sun, Kan Yuan, Xianyong Cao, and Juzhi Hou
Clim. Past, 20, 335–348, https://doi.org/10.5194/cp-20-335-2024, https://doi.org/10.5194/cp-20-335-2024, 2024
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Timon Netzel, Andrea Miebach, Thomas Litt, and Andreas Hense
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Anne Dallmeyer, Anneli Poska, Laurent Marquer, Andrea Seim, and Marie-José Gaillard
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Clim. Past, 19, 1481–1506, https://doi.org/10.5194/cp-19-1481-2023, https://doi.org/10.5194/cp-19-1481-2023, 2023
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Earth Syst. Sci. Data, 15, 2235–2258, https://doi.org/10.5194/essd-15-2235-2023, https://doi.org/10.5194/essd-15-2235-2023, 2023
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Lake sediment from the Russian Arctic was studied for microalgae and organic matter chemistry dated back to the last glacial 28 000 years. Species and chemistry responded to environmental changes such as the Younger Dryas cold event and the Holocene thermal maximum. Organic carbon accumulation correlated with rates of microalgae deposition only during warm episodes but not during the cold glacial.
Simeon Lisovski, Alexandra Runge, Iuliia Shevtsova, Nele Landgraf, Anne Morgenstern, Ronald Reagan Okoth, Matthias Fuchs, Nikolay Lashchinskiy, Carl Stadie, Alison Beamish, Ulrike Herzschuh, Guido Grosse, and Birgit Heim
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2023-36, https://doi.org/10.5194/essd-2023-36, 2023
Revised manuscript has not been submitted
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The Lena Delta is the largest river delta in the Arctic, and represents a biodiversity hotspot. Here, we describe multiple field datasets and a detailed habitat classification map for the Lena Delta. We present context and methods of these openly available datasets and show how they can improve our understanding of the rapidly changing Arctic tundra system.
Furong Li, Marie-José Gaillard, Xianyong Cao, Ulrike Herzschuh, Shinya Sugita, Jian Ni, Yan Zhao, Chengbang An, Xiaozhong Huang, Yu Li, Hongyan Liu, Aizhi Sun, and Yifeng Yao
Earth Syst. Sci. Data, 15, 95–112, https://doi.org/10.5194/essd-15-95-2023, https://doi.org/10.5194/essd-15-95-2023, 2023
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The objective of this study is present the first gridded and temporally continuous quantitative plant-cover reconstruction for temperate and northern subtropical China over the last 12 millennia. The reconstructions are based on 94 pollen records and include estimates for 27 plant taxa, 10 plant functional types, and 3 land-cover types. The dataset is suitable for palaeoclimate modelling and the evaluation of simulated past vegetation cover and anthropogenic land-cover change from models.
Timon Miesner, Ulrike Herzschuh, Luidmila A. Pestryakova, Mareike Wieczorek, Evgenii S. Zakharov, Alexei I. Kolmogorov, Paraskovya V. Davydova, and Stefan Kruse
Earth Syst. Sci. Data, 14, 5695–5716, https://doi.org/10.5194/essd-14-5695-2022, https://doi.org/10.5194/essd-14-5695-2022, 2022
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We present data which were collected on expeditions to the northeast of the Russian Federation. One table describes the 226 locations we visited during those expeditions, and the other describes 40 289 trees which we recorded at these locations. We found out that important information on the forest cannot be predicted precisely from satellites. Thus, for anyone interested in distant forests, it is important to go to there and take measurements or use data (as presented here).
Femke van Geffen, Birgit Heim, Frederic Brieger, Rongwei Geng, Iuliia A. Shevtsova, Luise Schulte, Simone M. Stuenzi, Nadine Bernhardt, Elena I. Troeva, Luidmila A. Pestryakova, Evgenii S. Zakharov, Bringfried Pflug, Ulrike Herzschuh, and Stefan Kruse
Earth Syst. Sci. Data, 14, 4967–4994, https://doi.org/10.5194/essd-14-4967-2022, https://doi.org/10.5194/essd-14-4967-2022, 2022
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SiDroForest is an attempt to remedy data scarcity regarding vegetation data in the circumpolar region, whilst providing adjusted and labeled data for machine learning and upscaling practices. SiDroForest contains four datasets that include SfM point clouds, individually labeled trees, synthetic tree crowns and labeled Sentinel-2 patches that provide insights into the vegetation composition and forest structure of two important vegetation transition zones in Siberia, Russia.
Nannan Wang, Lina Liu, Xiaohuan Hou, Yanrong Zhang, Haicheng Wei, and Xianyong Cao
Clim. Past, 18, 2381–2399, https://doi.org/10.5194/cp-18-2381-2022, https://doi.org/10.5194/cp-18-2381-2022, 2022
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We reconstructed the vegetation and climate change since the last 14.2 ka BP from a fossil pollen record together with multiple proxies (grain size, contents of total organic carbon and total nitrogen) on the northeast Tibetan Plateau. The results reveal that an arid climate occurs in the early Holocene and the vegetation could be disturbed by human activities to some extent after ca. 0.24 ka BP (1710 CE).
Ulrike Herzschuh, Chenzhi Li, Thomas Böhmer, Alexander K. Postl, Birgit Heim, Andrei A. Andreev, Xianyong Cao, Mareike Wieczorek, and Jian Ni
Earth Syst. Sci. Data, 14, 3213–3227, https://doi.org/10.5194/essd-14-3213-2022, https://doi.org/10.5194/essd-14-3213-2022, 2022
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Pollen preserved in environmental archives such as lake sediments and bogs are extensively used for reconstructions of past vegetation and climate. Here we present LegacyPollen 1.0, a dataset of 2831 fossil pollen records from all over the globe that were collected from publicly available databases. We harmonized the names of the pollen taxa so that all datasets can be jointly investigated. LegacyPollen 1.0 is available as an open-access dataset.
Ramesh Glückler, Rongwei Geng, Lennart Grimm, Izabella Baisheva, Ulrike Herzschuh, Kathleen R. Stoof-Leichsenring, Stefan Kruse, Andrei Andreev, Luidmila Pestryakova, and Elisabeth Dietze
EGUsphere, https://doi.org/10.5194/egusphere-2022-395, https://doi.org/10.5194/egusphere-2022-395, 2022
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Despite rapidly intensifying wildfire seasons in Siberian boreal forests, little is known about long-term relationships between changes in vegetation and shifts in wildfire activity. Using lake sediment proxies, we reconstruct such environmental changes over the past 10,800 years in Central Yakutia. We find that a more open forest may facilitate increased amounts of vegetation burning. The present-day dense larch forest might yet be mediating the current climate-driven wildfire intensification.
Manuel Chevalier
Clim. Past, 18, 821–844, https://doi.org/10.5194/cp-18-821-2022, https://doi.org/10.5194/cp-18-821-2022, 2022
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This paper introduces a new R package to perform quantitative climate reconstructions from palaeoecological datasets. The package includes calibration data for several commonly used terrestrial (e.g. pollen) and marine (e.g. foraminifers) climate proxies to enable its use in various environments globally. In addition, the built-in graphical diagnostic tools simplify the evaluation and interpretations of the results. No coding skills are required to use crestr.
Chenzhi Li, Alexander K. Postl, Thomas Böhmer, Xianyong Cao, Andrew M. Dolman, and Ulrike Herzschuh
Earth Syst. Sci. Data, 14, 1331–1343, https://doi.org/10.5194/essd-14-1331-2022, https://doi.org/10.5194/essd-14-1331-2022, 2022
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Here we present a global chronology framework of 2831 palynological records, including globally harmonized chronologies covering up to 273 000 years. A comparison with the original chronologies reveals a major improvement according to our assessment. Our chronology framework and revised chronologies will interest a broad geoscientific community, as it provides the opportunity to make use in synthesis studies of, for example, pollen-based vegetation and climate change.
Stefan Kruse, Simone M. Stuenzi, Julia Boike, Moritz Langer, Josias Gloy, and Ulrike Herzschuh
Geosci. Model Dev., 15, 2395–2422, https://doi.org/10.5194/gmd-15-2395-2022, https://doi.org/10.5194/gmd-15-2395-2022, 2022
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We coupled established models for boreal forest (LAVESI) and permafrost dynamics (CryoGrid) in Siberia to investigate interactions of the diverse vegetation layer with permafrost soils. Our tests showed improved active layer depth estimations and newly included species growth according to their species-specific limits. We conclude that the new model system can be applied to simulate boreal forest dynamics and transitions under global warming and disturbances, expanding our knowledge.
Jean-Philippe Baudouin, Michael Herzog, and Cameron A. Petrie
Weather Clim. Dynam., 2, 1187–1207, https://doi.org/10.5194/wcd-2-1187-2021, https://doi.org/10.5194/wcd-2-1187-2021, 2021
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Western disturbances are mid-latitude, high-altitude, low-pressure areas that bring orographic precipitation into the Upper Indus Basin. Using statistical tools, we show that the interaction between western disturbances and relief explains the near-surface, cross-barrier wind activity. We also reveal the existence of a moisture pathway from the nearby seas. Overall, we offer a conceptual framework for western-disturbance activity, particularly in terms of precipitation.
Anne Dallmeyer, Martin Claussen, Stephan J. Lorenz, Michael Sigl, Matthew Toohey, and Ulrike Herzschuh
Clim. Past, 17, 2481–2513, https://doi.org/10.5194/cp-17-2481-2021, https://doi.org/10.5194/cp-17-2481-2021, 2021
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Using the comprehensive Earth system model, MPI-ESM1.2, we explore the global Holocene vegetation changes and interpret them in terms of the Holocene climate change. The model results reveal that most of the Holocene vegetation transitions seen outside the high northern latitudes can be attributed to modifications in the intensity of the global summer monsoons.
Stuart A. Vyse, Ulrike Herzschuh, Gregor Pfalz, Lyudmila A. Pestryakova, Bernhard Diekmann, Norbert Nowaczyk, and Boris K. Biskaborn
Biogeosciences, 18, 4791–4816, https://doi.org/10.5194/bg-18-4791-2021, https://doi.org/10.5194/bg-18-4791-2021, 2021
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Lakes act as important stores of organic carbon and inorganic sediment material. This study provides a first investigation into carbon and sediment accumulation and storage within an Arctic glacial lake from Far East Russia. It shows that major shifts are related to palaeoclimate variation that affects the development of the lake and its surrounding catchment. Spatial differences to other lake systems from other regions may reflect variability in processes controlled by latitude and altitude.
Xianyong Cao, Fang Tian, Kai Li, Jian Ni, Xiaoshan Yu, Lina Liu, and Nannan Wang
Earth Syst. Sci. Data, 13, 3525–3537, https://doi.org/10.5194/essd-13-3525-2021, https://doi.org/10.5194/essd-13-3525-2021, 2021
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The Tibetan Plateau is quite remote, and it is difficult to collect samples on it; the previous modern pollen data are located on a nearby road, and there is a large geographic gap in the eastern and central Tibetan Plateau. Our novel pollen data can fill the gap and will be valuable in establishing a complete dataset covering the entire Tibetan Plateau, thus helping us to get a comprehensive understanding. In addition, the dataset can also be used to investigate plant species distribution.
Ramesh Glückler, Ulrike Herzschuh, Stefan Kruse, Andrei Andreev, Stuart Andrew Vyse, Bettina Winkler, Boris K. Biskaborn, Luidmila Pestryakova, and Elisabeth Dietze
Biogeosciences, 18, 4185–4209, https://doi.org/10.5194/bg-18-4185-2021, https://doi.org/10.5194/bg-18-4185-2021, 2021
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Data about past fire activity are very sparse in Siberia. This study presents a first high-resolution record of charcoal particles from lake sediments in boreal eastern Siberia. It indicates that current levels of charcoal accumulation are not unprecedented. While a recent increase in reconstructed fire frequency coincides with rising temperatures and increasing human activity, vegetation composition does not seem to be a major driver behind changes in the fire regime in the past two millennia.
Lydia Stolpmann, Caroline Coch, Anne Morgenstern, Julia Boike, Michael Fritz, Ulrike Herzschuh, Kathleen Stoof-Leichsenring, Yury Dvornikov, Birgit Heim, Josefine Lenz, Amy Larsen, Katey Walter Anthony, Benjamin Jones, Karen Frey, and Guido Grosse
Biogeosciences, 18, 3917–3936, https://doi.org/10.5194/bg-18-3917-2021, https://doi.org/10.5194/bg-18-3917-2021, 2021
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Our new database summarizes DOC concentrations of 2167 water samples from 1833 lakes in permafrost regions across the Arctic to provide insights into linkages between DOC and environment. We found increasing lake DOC concentration with decreasing permafrost extent and higher DOC concentrations in boreal permafrost sites compared to tundra sites. Our study shows that DOC concentration depends on the environmental properties of a lake, especially permafrost extent, ecoregion, and vegetation.
Iuliia Shevtsova, Ulrike Herzschuh, Birgit Heim, Luise Schulte, Simone Stünzi, Luidmila A. Pestryakova, Evgeniy S. Zakharov, and Stefan Kruse
Biogeosciences, 18, 3343–3366, https://doi.org/10.5194/bg-18-3343-2021, https://doi.org/10.5194/bg-18-3343-2021, 2021
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In the light of climate changes in subarctic regions, notable general increase in above-ground biomass for the past 15 years (2000 to 2017) was estimated along a tundra–taiga gradient of central Chukotka (Russian Far East). The greatest increase occurred in the northern taiga in the areas of larch closed-canopy forest expansion with Cajander larch as a main contributor. For the estimations, we used field data (taxa-separated plant biomass, 2018) and upscaled it based on Landsat satellite data.
Simone Maria Stuenzi, Julia Boike, William Cable, Ulrike Herzschuh, Stefan Kruse, Luidmila A. Pestryakova, Thomas Schneider von Deimling, Sebastian Westermann, Evgenii S. Zakharov, and Moritz Langer
Biogeosciences, 18, 343–365, https://doi.org/10.5194/bg-18-343-2021, https://doi.org/10.5194/bg-18-343-2021, 2021
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Boreal forests in eastern Siberia are an essential component of global climate patterns. We use a physically based model and field measurements to study the interactions between forests, permanently frozen ground and the atmosphere. We find that forests exert a strong control on the thermal state of permafrost through changing snow cover dynamics and altering the surface energy balance, through absorbing most of the incoming solar radiation and suppressing below-canopy turbulent fluxes.
Mareike Wieczorek and Ulrike Herzschuh
Earth Syst. Sci. Data, 12, 3515–3528, https://doi.org/10.5194/essd-12-3515-2020, https://doi.org/10.5194/essd-12-3515-2020, 2020
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Relative pollen productivity (RPP) estimates are used to estimate vegetation cover from pollen records. This study provides (i) a compilation of northern hemispheric RPP studies, allowing researchers to identify suitable sets for their study region and to identify data gaps for future research, and (ii) taxonomically harmonized, unified RPP sets for China, Europe, North America, and the whole Northern Hemisphere, generated from the available studies.
Basil A. S. Davis, Manuel Chevalier, Philipp Sommer, Vachel A. Carter, Walter Finsinger, Achille Mauri, Leanne N. Phelps, Marco Zanon, Roman Abegglen, Christine M. Åkesson, Francisca Alba-Sánchez, R. Scott Anderson, Tatiana G. Antipina, Juliana R. Atanassova, Ruth Beer, Nina I. Belyanina, Tatiana A. Blyakharchuk, Olga K. Borisova, Elissaveta Bozilova, Galina Bukreeva, M. Jane Bunting, Eleonora Clò, Daniele Colombaroli, Nathalie Combourieu-Nebout, Stéphanie Desprat, Federico Di Rita, Morteza Djamali, Kevin J. Edwards, Patricia L. Fall, Angelica Feurdean, William Fletcher, Assunta Florenzano, Giulia Furlanetto, Emna Gaceur, Arsenii T. Galimov, Mariusz Gałka, Iria García-Moreiras, Thomas Giesecke, Roxana Grindean, Maria A. Guido, Irina G. Gvozdeva, Ulrike Herzschuh, Kari L. Hjelle, Sergey Ivanov, Susanne Jahns, Vlasta Jankovska, Gonzalo Jiménez-Moreno, Monika Karpińska-Kołaczek, Ikuko Kitaba, Piotr Kołaczek, Elena G. Lapteva, Małgorzata Latałowa, Vincent Lebreton, Suzanne Leroy, Michelle Leydet, Darya A. Lopatina, José Antonio López-Sáez, André F. Lotter, Donatella Magri, Elena Marinova, Isabelle Matthias, Anastasia Mavridou, Anna Maria Mercuri, Jose Manuel Mesa-Fernández, Yuri A. Mikishin, Krystyna Milecka, Carlo Montanari, César Morales-Molino, Almut Mrotzek, Castor Muñoz Sobrino, Olga D. Naidina, Takeshi Nakagawa, Anne Birgitte Nielsen, Elena Y. Novenko, Sampson Panajiotidis, Nata K. Panova, Maria Papadopoulou, Heather S. Pardoe, Anna Pędziszewska, Tatiana I. Petrenko, María J. Ramos-Román, Cesare Ravazzi, Manfred Rösch, Natalia Ryabogina, Silvia Sabariego Ruiz, J. Sakari Salonen, Tatyana V. Sapelko, James E. Schofield, Heikki Seppä, Lyudmila Shumilovskikh, Normunds Stivrins, Philipp Stojakowits, Helena Svobodova Svitavska, Joanna Święta-Musznicka, Ioan Tantau, Willy Tinner, Kazimierz Tobolski, Spassimir Tonkov, Margarita Tsakiridou, Verushka Valsecchi, Oksana G. Zanina, and Marcelina Zimny
Earth Syst. Sci. Data, 12, 2423–2445, https://doi.org/10.5194/essd-12-2423-2020, https://doi.org/10.5194/essd-12-2423-2020, 2020
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The Eurasian Modern Pollen Database (EMPD) contains pollen counts and associated metadata for 8134 modern pollen samples from across the Eurasian region. The EMPD is part of, and complementary to, the European Pollen Database (EPD) which contains data on fossil pollen found in Late Quaternary sedimentary archives. The purpose of the EMPD is to provide calibration datasets and other data to support palaeoecological research on past climates and vegetation cover over the Quaternary period.
Rita Glowienka-Hense, Andreas Hense, Sebastian Brune, and Johanna Baehr
Adv. Stat. Clim. Meteorol. Oceanogr., 6, 103–113, https://doi.org/10.5194/ascmo-6-103-2020, https://doi.org/10.5194/ascmo-6-103-2020, 2020
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A new method for weather and climate forecast model evaluation with respect to observations is proposed. Individually added values are estimated for each model, together with shared information both models provide equally on the observations. Finally, shared model information, which is not present in the observations, is calculated. The method is applied to two examples from climate and weather forecasting, showing new perspectives for model evaluation.
Heike H. Zimmermann, Kathleen R. Stoof-Leichsenring, Stefan Kruse, Juliane Müller, Ruediger Stein, Ralf Tiedemann, and Ulrike Herzschuh
Ocean Sci., 16, 1017–1032, https://doi.org/10.5194/os-16-1017-2020, https://doi.org/10.5194/os-16-1017-2020, 2020
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This study targets high-resolution, diatom-specific sedimentary ancient DNA using a DNA metabarcoding approach. Diatom DNA has been preserved with substantial taxonomic richness in the eastern Fram Strait over the past 30 000 years with taxonomic composition being dominated by cold-water and sea-ice-associated diatoms. Taxonomic reorganisations took place after the Last Glacial Maximum and after the Younger Dryas. Peak proportions of pennate diatoms might indicate past sea-ice presence.
Elisabeth Dietze, Kai Mangelsdorf, Andrei Andreev, Cornelia Karger, Laura T. Schreuder, Ellen C. Hopmans, Oliver Rach, Dirk Sachse, Volker Wennrich, and Ulrike Herzschuh
Clim. Past, 16, 799–818, https://doi.org/10.5194/cp-16-799-2020, https://doi.org/10.5194/cp-16-799-2020, 2020
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Long-term climate change impacts on fire, vegetation and permafrost in the Arctic are uncertain. Here, we show the high potential of organic compounds from low-temperature biomass burning to serve as proxies for surface fires in lake deposits. During warm periods of the last 430 000 years, surface fires are closely linked to the larch taiga forest with its moss–lichen ground vegetation that isolates the permafrost. They have reduced in warm–wet, spruce–dominated and cool–dry steppe environments.
Jean-Philippe Baudouin, Michael Herzog, and Cameron A. Petrie
Hydrol. Earth Syst. Sci., 24, 427–450, https://doi.org/10.5194/hess-24-427-2020, https://doi.org/10.5194/hess-24-427-2020, 2020
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The amount of precipitation falling in the Indus River basin remains uncertain while its variability impacts 100 million inhabitants. A comparison of datasets from diverse sources (ground remote observations, model outputs) reduces this uncertainty significantly. Grounded observations offer the most reliable long-term variability but with important underestimation in winter over the mountains. By contrast, recent model outputs offer better estimations of total amount and short-term variability.
Xianyong Cao, Fang Tian, Andrei Andreev, Patricia M. Anderson, Anatoly V. Lozhkin, Elena Bezrukova, Jian Ni, Natalia Rudaya, Astrid Stobbe, Mareike Wieczorek, and Ulrike Herzschuh
Earth Syst. Sci. Data, 12, 119–135, https://doi.org/10.5194/essd-12-119-2020, https://doi.org/10.5194/essd-12-119-2020, 2020
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Pollen percentages in spectra cannot be utilized to indicate past plant abundance directly because of the different pollen productivities among plants. In this paper, we applied relative pollen productivity estimates (PPEs) to calibrate plant abundances during the last 40 kyr using pollen counts from 203 pollen spectra in northern Asia. Results indicate the vegetation are generally stable during the Holocene and that climate change is the primary factor.
Anne Dallmeyer, Martin Claussen, Stephan J. Lorenz, and Timothy Shanahan
Clim. Past, 16, 117–140, https://doi.org/10.5194/cp-16-117-2020, https://doi.org/10.5194/cp-16-117-2020, 2020
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We analyse the end of the African humid period (AHP) in a transient Holocene simulation performed with the comprehensive Earth system model MPI-ESM1.2. The model reproduces the time-transgressive end of the AHP evident in proxy data and indicates that changes in moisture can be attributed to the retreat of the summer monsoon and to changes in the extratropical troughs. The spatially varying impact of these systems imposes regionally different responses to the Holocene insolation change.
Fei Lu, Nils Weitzel, and Adam H. Monahan
Nonlin. Processes Geophys., 26, 227–250, https://doi.org/10.5194/npg-26-227-2019, https://doi.org/10.5194/npg-26-227-2019, 2019
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ll-posedness of the inverse problem and sparse noisy data are two major challenges in the modeling of high-dimensional spatiotemporal processes. We present a Bayesian inference method with a strongly regularized posterior to overcome these challenges, enabling joint state-parameter estimation and quantifying uncertainty in the estimation. We demonstrate the method on a physically motivated nonlinear stochastic partial differential equation arising from paleoclimate construction.
Xianyong Cao, Fang Tian, Furong Li, Marie-José Gaillard, Natalia Rudaya, Qinghai Xu, and Ulrike Herzschuh
Clim. Past, 15, 1503–1536, https://doi.org/10.5194/cp-15-1503-2019, https://doi.org/10.5194/cp-15-1503-2019, 2019
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The high-quality pollen records (collected from lakes and peat bogs) of the last 40 ka cal BP form north Asia are homogenized and the plant abundance signals are calibrated by the modern relative pollen productivity estimates. Calibrated plant abundances for each site are generally consistent with in situ modern vegetation, and vegetation changes within the regions are characterized by minor changes in the abundance of major taxa rather than by invasions of new taxa during the last 40 ka cal BP.
Nils Weitzel, Andreas Hense, and Christian Ohlwein
Clim. Past, 15, 1275–1301, https://doi.org/10.5194/cp-15-1275-2019, https://doi.org/10.5194/cp-15-1275-2019, 2019
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A new method for probabilistic spatial reconstructions of past climate states is presented, which combines pollen data with a multi-model ensemble of climate simulations in a Bayesian framework. The approach is applied to reconstruct summer and winter temperature in Europe during the mid-Holocene. Our reconstructions account for multiple sources of uncertainty and are well suited for quantitative statistical analyses of the climate under different forcing conditions.
Stefan Kruse, Alexander Gerdes, Nadja J. Kath, Laura S. Epp, Kathleen R. Stoof-Leichsenring, Luidmila A. Pestryakova, and Ulrike Herzschuh
Biogeosciences, 16, 1211–1224, https://doi.org/10.5194/bg-16-1211-2019, https://doi.org/10.5194/bg-16-1211-2019, 2019
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How fast might the arctic treeline in northern central Siberia migrate northwards under current global warming? To answer this, we newly parameterized dispersal processes in the individual-based and spatially explicit model LAVESI-WIND based on parentage analysis. Simulation results show that northernmost open forest stands are migrating at an unexpectedly slow rate into tundra. We conclude that the treeline currently lags behind the strong warming and will remain slow in the upcoming decades.
Anne Dallmeyer, Martin Claussen, and Victor Brovkin
Clim. Past, 15, 335–366, https://doi.org/10.5194/cp-15-335-2019, https://doi.org/10.5194/cp-15-335-2019, 2019
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A simple but powerful method for the biomisation of plant functional type distributions is introduced and tested for six different dynamic global vegetation models based on pre-industrial and palaeo-simulations. The method facilitates the direct comparison between vegetation distributions simulated by different Earth system models and between model results and the pollen-based biome reconstructions. It is therefore a powerful tool for the evaluation of Earth system models.
Stefan Kruse, Alexander Gerdes, Nadja J. Kath, and Ulrike Herzschuh
Geosci. Model Dev., 11, 4451–4467, https://doi.org/10.5194/gmd-11-4451-2018, https://doi.org/10.5194/gmd-11-4451-2018, 2018
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It is of major interest to estimate feedbacks of arctic ecosystems to global warming in the upcoming decades. However, the speed of this response is driven by the potential of species to migrate and the timing and spatial scale for this is rather uncertain. To close this knowledge gap, we updated a very detailed vegetation model by including seed and pollen dispersal driven by wind speed and direction. The new model can substantially help in unveiling the important drivers of migration dynamics.
Rita Glowienka-Hense, Andreas Hense, Thomas Spangehl, and Marc Schröder
Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2018-141, https://doi.org/10.5194/gmd-2018-141, 2018
Revised manuscript not accepted
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Ensemble forecast verification treats the issues of forecast errors and uncertainty estimated from ensemble spread. We suggest measures based on relative entropy. For continuous variables correlation and the mean ratio of the ensemble spread to climate variance (analysis of variance (anova)) are related to these entropies. For categorical data corresponding scores are deduced that allow the comparison with continuous data.
Romy Zibulski, Felix Wesener, Heinz Wilkes, Birgit Plessen, Luidmila A. Pestryakova, and Ulrike Herzschuh
Biogeosciences, 14, 1617–1630, https://doi.org/10.5194/bg-14-1617-2017, https://doi.org/10.5194/bg-14-1617-2017, 2017
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We investigated variations of isotopic and biochemical parameters in arctic mosses. We were able to differentiate habitat groups of mosses (classified by moisture gradient) by elemental content and isotopic ratios (δ13C, δ15N). Some species showed intraspecific variability in their isotopic composition along the moisture gradient. Furthermore n-alkanes showed interesting patterns for species identification.
Anne Dallmeyer, Martin Claussen, Jian Ni, Xianyong Cao, Yongbo Wang, Nils Fischer, Madlene Pfeiffer, Liya Jin, Vyacheslav Khon, Sebastian Wagner, Kerstin Haberkorn, and Ulrike Herzschuh
Clim. Past, 13, 107–134, https://doi.org/10.5194/cp-13-107-2017, https://doi.org/10.5194/cp-13-107-2017, 2017
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The vegetation distribution in eastern Asia is supposed to be very sensitive to climate change. Since proxy records are scarce, hitherto a mechanistic understanding of the past spatio-temporal climate–vegetation relationship is lacking. To assess the Holocene vegetation change, we forced the diagnostic biome model BIOME4 with climate anomalies of different transient climate simulations.
Heike Hildegard Zimmermann, Elena Raschke, Laura Saskia Epp, Kathleen Rosmarie Stoof-Leichsenring, Georg Schwamborn, Lutz Schirrmeister, Pier Paul Overduin, and Ulrike Herzschuh
Biogeosciences, 14, 575–596, https://doi.org/10.5194/bg-14-575-2017, https://doi.org/10.5194/bg-14-575-2017, 2017
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Organic matter stored in permafrost will start decomposing due to climate warming. To better understand its composition in ice-rich Yedoma, we analyzed ancient sedimentary DNA, pollen and non-pollen palynomorphs throughout an 18.9 m long permafrost core. The combination of both proxies allow an interpretation both of regional floristic changes and of the local environmental conditions at the time of deposition.
Olga Lyapina, Martin G. Schultz, and Andreas Hense
Atmos. Chem. Phys., 16, 6863–6881, https://doi.org/10.5194/acp-16-6863-2016, https://doi.org/10.5194/acp-16-6863-2016, 2016
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This study applies numerical clustering for the classification of about 1500 ozone data sets in Europe. We show the usefulness of cluster analysis (CA) for the quantitative evaluation of a global model: pre-selection of stations and validation of a global model in a phase-space produce clearer and more interpretable results. CA can be easily updated for new stations, different length of data, and other type of input properties, as well as other type of data (for example, meteorological).
Liv Heinecke, Steffen Mischke, Karsten Adler, Anja Barth, Boris K. Biskaborn, Birgit Plessen, Ingmar Nitze, Gerhard Kuhn, Ilhomjon Rajabov, and Ulrike Herzschuh
Clim. Past Discuss., https://doi.org/10.5194/cp-2016-34, https://doi.org/10.5194/cp-2016-34, 2016
Revised manuscript not accepted
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The climate history of the Pamir Mountains (Tajikistan) during the last ~29 kyr was investigated using sediments from Lake Karakul as environmental archive. The inferred lake level was highest from the Late Glacial to the early Holocene and lake changes were mainly coupled to climate change. We conclude that the joint influence of Westerlies and Indian Monsoon during the early Holocene caused comparatively moist conditions, while dominating Westerlies yielded dry conditions since 6.7 cal kyr BP.
M. Fritz, T. Opel, G. Tanski, U. Herzschuh, H. Meyer, A. Eulenburg, and H. Lantuit
The Cryosphere, 9, 737–752, https://doi.org/10.5194/tc-9-737-2015, https://doi.org/10.5194/tc-9-737-2015, 2015
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Ground ice in permafrost has not, until now, been considered to be a source of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC) and other elements that are important for ecosystems and carbon cycling.
Ice wedges in the Arctic Yedoma region hold 45.2 Tg DOC (Tg = 10^12g), 33.6 Tg DIC and a freshwater reservoir of 4200 km³.
Leaching of terrestrial organic matter is the most relevant process of DOC sequestration into ground ice.
J. Strauss, L. Schirrmeister, K. Mangelsdorf, L. Eichhorn, S. Wetterich, and U. Herzschuh
Biogeosciences, 12, 2227–2245, https://doi.org/10.5194/bg-12-2227-2015, https://doi.org/10.5194/bg-12-2227-2015, 2015
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Climatic warming is affecting permafrost, including decomposition of organic matter (OM). However, quantitative data for the quality of OM and its availability for decomposition is limited. We analyzed the quality of OM in late Pleistocene (Yedoma) and Holocene (thermokarst) deposits. A lack of depth trends reveals a constant quality of OM showing that permafrost acts like a freezer, preserving OM quality. This OM will be susceptible to decomposition under climatic warming.
B. Aichner, S. J. Feakins, J. E. Lee, U. Herzschuh, and X. Liu
Clim. Past, 11, 619–633, https://doi.org/10.5194/cp-11-619-2015, https://doi.org/10.5194/cp-11-619-2015, 2015
A. Dallmeyer, M. Claussen, N. Fischer, K. Haberkorn, S. Wagner, M. Pfeiffer, L. Jin, V. Khon, Y. Wang, and U. Herzschuh
Clim. Past, 11, 305–326, https://doi.org/10.5194/cp-11-305-2015, https://doi.org/10.5194/cp-11-305-2015, 2015
J. D. Keller and A. Hense
Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npgd-1-1509-2014, https://doi.org/10.5194/npgd-1-1509-2014, 2014
Preprint withdrawn
A. A. Andreev, P. E. Tarasov, V. Wennrich, E. Raschke, U. Herzschuh, N. R. Nowaczyk, J. Brigham-Grette, and M. Melles
Clim. Past, 10, 1017–1039, https://doi.org/10.5194/cp-10-1017-2014, https://doi.org/10.5194/cp-10-1017-2014, 2014
Y. Wang, U. Herzschuh, L. S. Shumilovskikh, S. Mischke, H. J. B. Birks, J. Wischnewski, J. Böhner, F. Schlütz, F. Lehmkuhl, B. Diekmann, B. Wünnemann, and C. Zhang
Clim. Past, 10, 21–39, https://doi.org/10.5194/cp-10-21-2014, https://doi.org/10.5194/cp-10-21-2014, 2014
R. Zibulski, U. Herzschuh, L. A. Pestryakova, J. Wolter, S. Müller, N. Schilling, S. Wetterich, L. Schirrmeister, and F. Tian
Biogeosciences, 10, 5703–5728, https://doi.org/10.5194/bg-10-5703-2013, https://doi.org/10.5194/bg-10-5703-2013, 2013
Related subject area
Subject: Vegetation Dynamics | Archive: Terrestrial Archives | Timescale: Holocene
Palynological evidence reveals an arid early Holocene for the northeast Tibetan Plateau
Holocene wildfire regimes in western Siberia: interaction between peatland moisture conditions and the composition of plant functional types
2400 years of climate and human-induced environmental change recorded in sediments of Lake Młynek in northern Poland
Climate impacts on vegetation and fire dynamics since the last deglaciation at Moossee (Switzerland)
The 4.2 ka event in the vegetation record of the central Mediterranean
Vegetation and geochemical responses to Holocene rapid climate change in the Sierra Nevada (southeastern Iberia): the Laguna Hondera record
Response of Pinus sylvestris var. mongolica to water change and drought history reconstruction in the past 260 years, northeast China
Vegetation history and paleoclimate at Lake Dojran (FYROM/Greece) during the Late Glacial and Holocene
Holocene climate aridification trend and human impact interrupted by millennial- and centennial-scale climate fluctuations from a new sedimentary record from Padul (Sierra Nevada, southern Iberian Peninsula)
Dendrochronologically dated pine stumps document phase-wise bog expansion at a northwest German site between ca. 6700 and ca. 3400 BC
Autumn–winter minimum temperature changes in the southern Sikhote-Alin mountain range of northeastern Asia since 1529 AD
Postglacial fire history and interactions with vegetation and climate in southwestern Yunnan Province of China
Precipitation changes in the Mediterranean basin during the Holocene from terrestrial and marine pollen records: a model–data comparison
Environmental changes, climate and anthropogenic impact in south-east Tunisia during the last 8 kyr
Climate variability and human impact in South America during the last 2000 years: synthesis and perspectives from pollen records
Holocene Asian monsoon evolution revealed by a pollen record from an alpine lake on the southeastern margin of the Qinghai–Tibetan Plateau, China
7300 years of vegetation history and climate for NW Malta: a Holocene perspective
Climate-driven expansion of blanket bogs in Britain during the Holocene
Late Holocene vegetation changes in relation with climate fluctuations and human activity in Languedoc (southern France)
Effects of past climate variability on fire and vegetation in the cerrãdo savanna of the Huanchaca Mesetta, NE Bolivia
Environmental and climatic changes in central Chilean Patagonia since the Late Glacial (Mallín El Embudo, 44° S)
Quantitative reconstruction of precipitation changes on the NE Tibetan Plateau since the Last Glacial Maximum – extending the concept of pollen source area to pollen-based climate reconstructions from large lakes
The last 7 millennia of vegetation and climate changes at Lago di Pergusa (central Sicily, Italy)
Contrasting patterns of climatic changes during the Holocene across the Italian Peninsula reconstructed from pollen data
Climate and vegetation changes during the Lateglacial and early–middle Holocene at Lake Ledro (southern Alps, Italy)
The Medieval Climate Anomaly and the Little Ice Age in the eastern Ecuadorian Andes
Palynological evidence for gradual vegetation and climate changes during the African Humid Period termination at 13°N from a Mega-Lake Chad sedimentary sequence
Climate, people, fire and vegetation: new insights into vegetation dynamics in the Eastern Mediterranean since the 1st century AD
Pollen-based reconstruction of Holocene vegetation and climate in southern Italy: the case of Lago Trifoglietti
Vegetation history of central Chukotka deduced from permafrost paleoenvironmental records of the El'gygytgyn Impact Crater
A seesaw in Mediterranean precipitation during the Roman Period linked to millennial-scale changes in the North Atlantic
Hydroclimate variability in the low-elevation Atacama Desert over the last 2500 yr
Pollen, vegetation change and climate at Lake Barombi Mbo (Cameroon) during the last ca. 33 000 cal yr BP: a numerical approach
Late Holocene plant and climate evolution at Lake Yoa, northern Chad: pollen data and climate simulations
Holocene vegetation and biomass changes on the Tibetan Plateau – a model-pollen data comparison
Vegetation response to the "African Humid Period" termination in Central Cameroon (7° N) – new pollen insight from Lake Mbalang
Putting the rise of the Inca Empire within a climatic and land management context
Nannan Wang, Lina Liu, Xiaohuan Hou, Yanrong Zhang, Haicheng Wei, and Xianyong Cao
Clim. Past, 18, 2381–2399, https://doi.org/10.5194/cp-18-2381-2022, https://doi.org/10.5194/cp-18-2381-2022, 2022
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We reconstructed the vegetation and climate change since the last 14.2 ka BP from a fossil pollen record together with multiple proxies (grain size, contents of total organic carbon and total nitrogen) on the northeast Tibetan Plateau. The results reveal that an arid climate occurs in the early Holocene and the vegetation could be disturbed by human activities to some extent after ca. 0.24 ka BP (1710 CE).
Angelica Feurdean, Andrei-Cosmin Diaconu, Mirjam Pfeiffer, Mariusz Gałka, Simon M. Hutchinson, Geanina Butiseaca, Natalia Gorina, Spassimir Tonkov, Aidin Niamir, Ioan Tantau, Hui Zhang, and Sergey Kirpotin
Clim. Past, 18, 1255–1274, https://doi.org/10.5194/cp-18-1255-2022, https://doi.org/10.5194/cp-18-1255-2022, 2022
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We used palaeoecological records from peatlands in southern Siberia. We showed that warmer climate conditions have lowered the water level and increased the fuel amount and flammability, consequently also increasing the frequency and severity of fires as well as the composition of tree types.
Fabian Welc, Jerzy Nitychoruk, Leszek Marks, Krzysztof Bińka, Anna Rogóż-Matyszczak, Milena Obremska, and Abdelfattah Zalat
Clim. Past, 17, 1181–1198, https://doi.org/10.5194/cp-17-1181-2021, https://doi.org/10.5194/cp-17-1181-2021, 2021
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Młynek Lake, located near the village of Janiki Wielkie (in the Warmia and Masuria region of north-east Poland) has been selected for multi-faceted palaeoenvironmental research based on a precise radiocarbon scale. Bottom sediments of this reservoir also contain unique information about anthropogenic activity and climate changes during last 2400 years.
Fabian Rey, Erika Gobet, Christoph Schwörer, Albert Hafner, Sönke Szidat, and Willy Tinner
Clim. Past, 16, 1347–1367, https://doi.org/10.5194/cp-16-1347-2020, https://doi.org/10.5194/cp-16-1347-2020, 2020
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We present a novel post Last Glacial Maximum sediment record from Moossee (Swiss Plateau, southern central Europe). For the first time, five major reorganizations of vegetation could be definitely linked to paramount postglacial temperature and/or moisture changes. Present-day beech-dominated forests have been resilient to long-term climate change and human land use. They may prevail in future if climate warming does not exceed the amplitude of Mid Holocene temperature and moisture variability.
Federico Di Rita and Donatella Magri
Clim. Past, 15, 237–251, https://doi.org/10.5194/cp-15-237-2019, https://doi.org/10.5194/cp-15-237-2019, 2019
Jose M. Mesa-Fernández, Gonzalo Jiménez-Moreno, Marta Rodrigo-Gámiz, Antonio García-Alix, Francisco J. Jiménez-Espejo, Francisca Martínez-Ruiz, R. Scott Anderson, Jon Camuera, and María J. Ramos-Román
Clim. Past, 14, 1687–1706, https://doi.org/10.5194/cp-14-1687-2018, https://doi.org/10.5194/cp-14-1687-2018, 2018
Liangjun Zhu, Qichao Yao, David J. Cooper, Shijie Han, and Xiaochun Wang
Clim. Past, 14, 1213–1228, https://doi.org/10.5194/cp-14-1213-2018, https://doi.org/10.5194/cp-14-1213-2018, 2018
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This paper presents a 260-year tree-ring-based PDSI reconstruction for the central Daxing'an Mountains, northeast China. A warm–wet pattern was identified for the Daxing'an Mountains in recent decades, while a warm–dry pattern was found for the Mongolian Plateau. Overall, the dry/wet variability of the Daxing'an Mountains and its relationship with the surrounding areas might be driven by Pacific and Atlantic Ocean oscillations.
Alessia Masi, Alexander Francke, Caterina Pepe, Matthias Thienemann, Bernd Wagner, and Laura Sadori
Clim. Past, 14, 351–367, https://doi.org/10.5194/cp-14-351-2018, https://doi.org/10.5194/cp-14-351-2018, 2018
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The first high-resolution Lake Dojran pollen record for the last 12 500 years is presented. The ecological succession shows Late Glacial steppe vegetation gradually replaced, since 11 500 yr BP, by Holocene mesophilous forests. The first human traces are recorded around 5000 yr BP and increased considerably since the Bronze Age. Pollen data and sedimentological, biomarker and diatom data available from the same core contribute to an understanding of the environmental history of the Balkans.
María J. Ramos-Román, Gonzalo Jiménez-Moreno, Jon Camuera, Antonio García-Alix, R. Scott Anderson, Francisco J. Jiménez-Espejo, and José S. Carrión
Clim. Past, 14, 117–137, https://doi.org/10.5194/cp-14-117-2018, https://doi.org/10.5194/cp-14-117-2018, 2018
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In this study we carried out a multiproxy high-resolution analysis on a sediment record from the Padul Basin in the Sierra Nevada (southern Iberian Peninsula). Padul is a classical and very unique site from the Mediterranean area as it contains a very long and continuous Quaternary sedimentary record. However, the uppermost part of the record was never recovered. In this study we focus on the last 4700 cal yr BP of Holocene climate variability and human activity in the Mediterranean area.
Inke Elisabeth Maike Achterberg, Jan Eckstein, Bernhard Birkholz, Andreas Bauerochse, and Hanns Hubert Leuschner
Clim. Past, 14, 85–100, https://doi.org/10.5194/cp-14-85-2018, https://doi.org/10.5194/cp-14-85-2018, 2018
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At a bog site at Totes Moor in northwest Germany a layer of pine tree stumps at the fen–bog transition was exposed by peat mining. The lateral expansion of ombrotrophic bog between 6703 BC and 3403 BC was reconstructed using the locations and dendrochronological dates of the tree stumps. The spatial pattern relates to the elevation a.s.l. of the mineral base beneath the peat. The temporal distribution of bog expansion pulses relates to climatic variation.
Olga N. Ukhvatkina, Alexander M. Omelko, Alexander A. Zhmerenetsky, and Tatyana Y. Petrenko
Clim. Past, 14, 57–71, https://doi.org/10.5194/cp-14-57-2018, https://doi.org/10.5194/cp-14-57-2018, 2018
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We reconstructed the minimum temperature for 505 years and found cold and warm periods, which correlate with reconstructed data for the Northern Hemisphere and neighboring territories. Our reconstructions are reflected in the fluctuations in ENSO, the short-term solar cycle, PDO, and the de Vries 200-year solar activity cycle. This is the first temperature reconstruction for this region and it is important for studying the climatic processes in the study region and in all of northeastern Asia.
Xiayun Xiao, Simon G. Haberle, Ji Shen, Bin Xue, Mark Burrows, and Sumin Wang
Clim. Past, 13, 613–627, https://doi.org/10.5194/cp-13-613-2017, https://doi.org/10.5194/cp-13-613-2017, 2017
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Knowledge of the past fire activity is a key for making sustainable management policies for forest ecosystems. A high-resolution macroscopic charcoal record from southwestern China reveals the postglacial fire history. Combined with the regional climate records and vegetation histories, it is concluded that fire was mainly controlled by climate before 4.3 ka and by combined action of climate and humans after 4.3 ka, and the relationship between fire activity and vegetation were also examined.
Odile Peyron, Nathalie Combourieu-Nebout, David Brayshaw, Simon Goring, Valérie Andrieu-Ponel, Stéphanie Desprat, Will Fletcher, Belinda Gambin, Chryssanthi Ioakim, Sébastien Joannin, Ulrich Kotthoff, Katerina Kouli, Vincent Montade, Jörg Pross, Laura Sadori, and Michel Magny
Clim. Past, 13, 249–265, https://doi.org/10.5194/cp-13-249-2017, https://doi.org/10.5194/cp-13-249-2017, 2017
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This study aims to reconstruct the climate evolution of the Mediterranean region during the Holocene from pollen data and model outputs. The model- and pollen-inferred precipitation estimates show overall agreement: the eastern Medit. experienced wetter-than-present summer conditions during the early–late Holocene. This regional climate model highlights how the patchy nature of climate signals and data in the Medit. may lead to stronger local signals than the large-scale pattern suggests.
Sahbi Jaouadi, Vincent Lebreton, Viviane Bout-Roumazeilles, Giuseppe Siani, Rached Lakhdar, Ridha Boussoffara, Laurent Dezileau, Nejib Kallel, Beya Mannai-Tayech, and Nathalie Combourieu-Nebout
Clim. Past, 12, 1339–1359, https://doi.org/10.5194/cp-12-1339-2016, https://doi.org/10.5194/cp-12-1339-2016, 2016
S. G. A. Flantua, H. Hooghiemstra, M. Vuille, H. Behling, J. F. Carson, W. D. Gosling, I. Hoyos, M. P. Ledru, E. Montoya, F. Mayle, A. Maldonado, V. Rull, M. S. Tonello, B. S. Whitney, and C. González-Arango
Clim. Past, 12, 483–523, https://doi.org/10.5194/cp-12-483-2016, https://doi.org/10.5194/cp-12-483-2016, 2016
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This paper serves as a guide to high-quality pollen records in South America that capture environmental variability during the last 2 millennia. We identify the pollen records suitable for climate modelling and discuss their sensitivity to the spatial signature of climate modes. Furthermore, evidence for human land use in pollen records is useful for archaeological hypothesis testing and important in distinguishing natural from anthropogenically driven vegetation change.
Enlou Zhang, Yongbo Wang, Weiwei Sun, and Ji Shen
Clim. Past, 12, 415–427, https://doi.org/10.5194/cp-12-415-2016, https://doi.org/10.5194/cp-12-415-2016, 2016
B. Gambin, V. Andrieu-Ponel, F. Médail, N. Marriner, O. Peyron, V. Montade, T. Gambin, C. Morhange, D. Belkacem, and M. Djamali
Clim. Past, 12, 273–297, https://doi.org/10.5194/cp-12-273-2016, https://doi.org/10.5194/cp-12-273-2016, 2016
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Based on the study of ancient microfossils, such as pollen and spores, this paper explores climate change in a Mediterranean island context. Using a multi-disciplinary approach this original research corroborates existing archaeological and historical data. It also uses comparative data from elsewhere in the central Mediterranean to ensure that the current research is placed within the appropriate geographic context.
A. V. Gallego-Sala, D. J. Charman, S. P. Harrison, G. Li, and I. C. Prentice
Clim. Past, 12, 129–136, https://doi.org/10.5194/cp-12-129-2016, https://doi.org/10.5194/cp-12-129-2016, 2016
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It has become a well-established paradigm that blanket bog landscapes in the British Isles are a result of forest clearance by early human populations. We provide a novel test of this hypothesis using results from bioclimatic modelling driven by cimate reconstructions compared with a database of peat initiation dates. Both results show similar patterns of peat initiation over time and space. This suggests that climate was the main driver of blanket bog inception and not human disturbance.
J. Azuara, N. Combourieu-Nebout, V. Lebreton, F. Mazier, S. D. Müller, and L. Dezileau
Clim. Past, 11, 1769–1784, https://doi.org/10.5194/cp-11-1769-2015, https://doi.org/10.5194/cp-11-1769-2015, 2015
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High-resolution pollen analyses undertaken on two cores from southern France allow us to separate anthropogenic effects from climatic impacts on environments over the last 4500 years. A long-term aridification trend is highlighted during the late Holocene, and three superimposed arid events are recorded around 4400, 2600 and 1200cal BP coinciding in time with Bond events. Human influence on vegetation is attested since the Bronze Age and became dominant at the beginning of the High Middle Ages.
S. Y. Maezumi, M. J. Power, F. E. Mayle, K. K. McLauchlan, and J. Iriarte
Clim. Past, 11, 835–853, https://doi.org/10.5194/cp-11-835-2015, https://doi.org/10.5194/cp-11-835-2015, 2015
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A 14,500-year, high-resolution, sedimentary record from Huanchaca Mesetta, a palm swamp located in the cerrãdo savanna in northeastern Bolivia, was analyzed for phytoliths, stable isotopes and charcoal. A non-analogue, cold-adapted vegetation community dominated the Late Glacial-Early Holocene period (14.5-9ka), which included trees and C3 Pooideae and C4 Panicoideae grasses. The Late Glacial vegetation was fire sensitive and fire activity during this period was low, likely responding to fuel av
M. E. de Porras, A. Maldonado, F. A. Quintana, A. Martel-Cea, O. Reyes, and C. Méndez
Clim. Past, 10, 1063–1078, https://doi.org/10.5194/cp-10-1063-2014, https://doi.org/10.5194/cp-10-1063-2014, 2014
Y. Wang, U. Herzschuh, L. S. Shumilovskikh, S. Mischke, H. J. B. Birks, J. Wischnewski, J. Böhner, F. Schlütz, F. Lehmkuhl, B. Diekmann, B. Wünnemann, and C. Zhang
Clim. Past, 10, 21–39, https://doi.org/10.5194/cp-10-21-2014, https://doi.org/10.5194/cp-10-21-2014, 2014
L. Sadori, E. Ortu, O. Peyron, G. Zanchetta, B. Vannière, M. Desmet, and M. Magny
Clim. Past, 9, 1969–1984, https://doi.org/10.5194/cp-9-1969-2013, https://doi.org/10.5194/cp-9-1969-2013, 2013
O. Peyron, M. Magny, S. Goring, S. Joannin, J.-L. de Beaulieu, E. Brugiapaglia, L. Sadori, G. Garfi, K. Kouli, C. Ioakim, and N. Combourieu-Nebout
Clim. Past, 9, 1233–1252, https://doi.org/10.5194/cp-9-1233-2013, https://doi.org/10.5194/cp-9-1233-2013, 2013
S. Joannin, B. Vannière, D. Galop, O. Peyron, J. N. Haas, A. Gilli, E. Chapron, S. B. Wirth, F. Anselmetti, M. Desmet, and M. Magny
Clim. Past, 9, 913–933, https://doi.org/10.5194/cp-9-913-2013, https://doi.org/10.5194/cp-9-913-2013, 2013
M.-P. Ledru, V. Jomelli, P. Samaniego, M. Vuille, S. Hidalgo, M. Herrera, and C. Ceron
Clim. Past, 9, 307–321, https://doi.org/10.5194/cp-9-307-2013, https://doi.org/10.5194/cp-9-307-2013, 2013
P. G. C. Amaral, A. Vincens, J. Guiot, G. Buchet, P. Deschamps, J.-C. Doumnang, and F. Sylvestre
Clim. Past, 9, 223–241, https://doi.org/10.5194/cp-9-223-2013, https://doi.org/10.5194/cp-9-223-2013, 2013
J. Bakker, E. Paulissen, D. Kaniewski, J. Poblome, V. De Laet, G. Verstraeten, and M. Waelkens
Clim. Past, 9, 57–87, https://doi.org/10.5194/cp-9-57-2013, https://doi.org/10.5194/cp-9-57-2013, 2013
S. Joannin, E. Brugiapaglia, J.-L. de Beaulieu, L. Bernardo, M. Magny, O. Peyron, S. Goring, and B. Vannière
Clim. Past, 8, 1973–1996, https://doi.org/10.5194/cp-8-1973-2012, https://doi.org/10.5194/cp-8-1973-2012, 2012
A. A. Andreev, E. Morozova, G. Fedorov, L. Schirrmeister, A. A. Bobrov, F. Kienast, and G. Schwamborn
Clim. Past, 8, 1287–1300, https://doi.org/10.5194/cp-8-1287-2012, https://doi.org/10.5194/cp-8-1287-2012, 2012
B. J. Dermody, H. J. de Boer, M. F. P. Bierkens, S. L. Weber, M. J. Wassen, and S. C. Dekker
Clim. Past, 8, 637–651, https://doi.org/10.5194/cp-8-637-2012, https://doi.org/10.5194/cp-8-637-2012, 2012
E. M. Gayo, C. Latorre, C. M. Santoro, A. Maldonado, and R. De Pol-Holz
Clim. Past, 8, 287–306, https://doi.org/10.5194/cp-8-287-2012, https://doi.org/10.5194/cp-8-287-2012, 2012
J. Lebamba, A. Vincens, and J. Maley
Clim. Past, 8, 59–78, https://doi.org/10.5194/cp-8-59-2012, https://doi.org/10.5194/cp-8-59-2012, 2012
A.-M. Lézine, W. Zheng, P. Braconnot, and G. Krinner
Clim. Past, 7, 1351–1362, https://doi.org/10.5194/cp-7-1351-2011, https://doi.org/10.5194/cp-7-1351-2011, 2011
A. Dallmeyer, M. Claussen, U. Herzschuh, and N. Fischer
Clim. Past, 7, 881–901, https://doi.org/10.5194/cp-7-881-2011, https://doi.org/10.5194/cp-7-881-2011, 2011
A. Vincens, G. Buchet, M. Servant, and ECOFIT Mbalang collaborators
Clim. Past, 6, 281–294, https://doi.org/10.5194/cp-6-281-2010, https://doi.org/10.5194/cp-6-281-2010, 2010
A. J. Chepstow-Lusty, M. R. Frogley, B. S. Bauer, M. J. Leng, K. P. Boessenkool, C. Carcaillet, A. A. Ali, and A. Gioda
Clim. Past, 5, 375–388, https://doi.org/10.5194/cp-5-375-2009, https://doi.org/10.5194/cp-5-375-2009, 2009
Cited articles
Allen, J. R. M., Hickler, T., Singarayer, J. S., Sykes, M. T., Valdes, P. J., and Huntley, B.: Last glacial vegetation of northern Eurasia, Quaternary Sci. Rev., 29, 2604–2618, https://doi.org/10.1016/j.quascirev.2010.05.031, 2010.
Allen, J. R. M., Forrest, M., Hickler, T., Singarayer, J. S., Valdes, P. J.,
and Huntley, B.: Global vegetation patterns of the past 140,000 years, J.
Biogeogr., 47, 2073–2090, https://doi.org/10.1111/jbi.13930, 2020.
Altman, D. G.: Practical statistics for medical research, CRC Press, ISBN 0412276305, 1990.
Bigelow, N. H., Brubaker, L. B., Edwards, M. E., Harrison, S. P., Prentice, I. C., Anderson, P. M., Andreev, A. A., Bartlein, P. J., Christensen, T. R.,
Cramer, W., Kaplan, J. O., Lozhkin, A. V., Matveyeva, N. V., Murray, D. F.,
McGuire, A. D., Razzhivin, V. Y., Ritchie, J. C., Smith, B., Walker, D. A.,
Gajewski, K., Wolf, V., Holmqvist, B. H., Igarashi, Y., Kremenetskii, K.,
Paus, A., Pisaric, M. F. J., and Volkova, V. S.: Climate change and Arctic
ecosystems: 1. Vegetation changes north of 55∘ N between the last
glacial maximum, mid-Holocene, and present, J. Geophys. Res.-Atmos., 108, D19, https://doi.org/10.1029/2002jd002558, 2003.
Binney, H. A., Willis, K. J., Edwards, M. E., Bhagwat, S. A., Anderson, P.
M., Andreev, A. A., Blaauw, M., Damblon, F., Haesaerts, P., Kienast, F.,
Kremenetski, K. V., Krivonogov, S. K., Lozhkin, A. V., MacDonald, G. M., Novenko, E. Y., Oksanen, P., Sapelko, T. V., Väliranta, M., and Vazhenina, L.: The distribution of late-Quaternary woody taxa in northern Eurasia: evidence from a new macrofossil database, Quaternary Sci. Rev., 28, 2445–2464, https://doi.org/10.1016/j.quascirev.2009.04.016, 2009.
Binney, H. A., Edwards, M. E., Macias-Fauria, M., Lozhkin, A., Anderson, P.,
Kaplan, J. O., Andreev, A. A., Bezrukova, E., Blyakharchuk, T. A., Jankovska, V., Khazina, I., Krivonogov, S., Kremenetski, K. V., Nield, J., Novenko, E. Yu., Ryabogina, N., Solovieva, N., Willis, K. J., Zernitskaya, V. P., and Jankovská, V.: Vegetation of Eurasia from the last glacial maximum to present: Key biogeographic patterns, Quaternary Sci. Rev., 157, 80–97, https://doi.org/10.1016/j.quascirev.2016.11.022, 2017.
Birks, H. J. B., Heiri, O., Seppä, H., and Bjune, A. E.: Strengths and
weaknesses of quantitative climate reconstructions based on Late-Quaternary
biological proxies, Open Ecol. J., 3, 68–110, https://doi.org/10.2174/1874213001003020068, 2010.
Brovkin, V., Raddatz, T., Reick, C. H., Claussen, M., and Gayler, V.: Global
biogeophysical interactions between forest and climate, Geophys. Res. Lett., 36, L07405, https://doi.org/10.1029/2009GL037543, 2009.
Cao, X., Tian, F., Dallmeyer, A., and Herzschuh, U.: Northern Hemisphere biome changes (>30∘ N) since 40 cal ka BP and their driving
factors inferred from model-data comparisons, Quaternary Sci. Rev., 220, 291–309, https://doi.org/10.1016/j.quascirev.2019.07.034, 2019.
Chevalier, M.: paleotools: a collection of statistical techniques to analyse palaeodata (v1.0.0), Zenodo [code], https://doi.org/10.5281/zenodo.7889631, 2023.
Chevalier, M., Davis, B. A. S., Heiri, O., Seppä, H., Chase, B. M., Gajewski, K., Lacourse, T., Telford, R. J., Finsinger, W., Guiot, J., Kühl, N., Maezumi, S. Y., Tipton, J. R., Carter, V. A., Brussel, T., Phelps, L. N., Dawson, A., Zanon, M., Vallé, F., Nolan, C., Mauri, A.,
de Vernal, A., Izumi, K., Holmström, L., Marsicek, J., Goring, S. J., Sommer, P. S., Chaput, M., and Kupriyanov, D.: Pollen-based climate reconstruction techniques for late Quaternary studies, Earth-Sci. Rev., 210, 103384, https://doi.org/10.1016/j.earscirev.2020.103384, 2020.
Cohen, J.: A Coefficient of Agreement for Nominal Scales, Educ. Psycholog. Meas., 20, 37–46, https://doi.org/10.1177/001316446002000104, 1960.
Dallmeyer, A., Claussen, M., Ni, J., Cao, X., Wang, Y., Fischer, N., Pfeiffer, M., Jin, L., Khon, V., Wagner, S., Haberkorn, K., and Herzschuh,
U.: Biome changes in Asia since the mid-Holocene – An analysis of different
transient Earth system model simulations, Clim. Past, 13, 107–134,
https://doi.org/10.5194/cp-13-107-2017, 2017.
Dowsett, H., Dolan, A., Rowley, D., Moucha, R., Forte, A. M., Mitrovica, J.
X., Pound, M., Salzmann, U., Robinson, M., Chandler, M., Foley, K., and Haywood, A.: The PRISM4 (mid-Piacenzian) paleoenvironmental reconstruction,
Clim. Past, 12, 1519–1538, https://doi.org/10.5194/cp-12-1519-2016, 2016.
Efron, B. and Tibshirani, R. J.: An introduction to the bootstrap, in: Monographs on statistics and applied probability, Vol. 57, CRC Press, ISBN 0412042312, 1994.
Finsinger, W. and Tinner, W.: Holocene vegetation and land-use changes in
response to climatic changes in the forelands of the southwestern Alps, Italy, J. Quaternary Sci., 21, 243–258, https://doi.org/10.1002/jqs.971, 2006.
Finsinger, W., Lane, C. S., van Den Brand, G. J., Wagner-Cremer, F., Blockley, S. P. E., and Lotter, A. F.: The lateglacial Quercus expansion in
the southern European Alps: Rapid vegetation response to a late Allerød
climate warming?, J. Quaternary Sci., 26, 694–702, https://doi.org/10.1002/jqs.1493, 2011.
Githumbi, E., Fyfe, R., Gaillard, M., Trondman, A., Mazier, F., Nielsen, A.-B., Poska, A., Sugita, S., Woodbridge, J., Azuara, J., Feurdean, A.,
Grindean, R., Lebreton, V., Marquer, L., Nebout-Combourieu, N., Stančikaitė, M., Tanţău, I., Tonkov, S., and Shumilovskikh,
L.: European pollen-based REVEALS land-cover reconstructions for the Holocene: methodology, mapping and potentials, Earth Syst. Sci. Data, 14, 1581–1619, https://doi.org/10.5194/essd-14-1581-2022, 2022.
Hargreaves, C. J., Dyer, M. S., Gaultois, M. W., Kurlin, V. A., and Rosseinsky, M. J.: The Earth Mover's Distance as a Metric for the Space of
Inorganic Compositions, Chem. Mater., 32, 10610–10620, https://doi.org/10.1021/acs.chemmater.0c03381, 2020.
Harris, I., Jones, P. D., Osborn, T. J., and Lister, D. H.: Updated high-resolution grids of monthly climatic observations – the CRU TS3.10
Dataset, Int. J. Climatol., 34, 623–642, https://doi.org/10.1002/joc.3711, 2014.
Henrot, A.-J., Utescher, T., Erdei, B., Dury, M., Hamon, N., Ramstein, G.,
Krapp, M., Herold, N., Goldner, A., Favre, E., Munhoven, G., and François, L.: Middle Miocene climate and vegetation models and their
validation with proxy data, Palaeogeogr. Palaeoclim. Palaeoecol., 467, 95–119, https://doi.org/10.1016/j.palaeo.2016.05.026, 2017.
Huntley, B., Alfano, M. J., Allen, J. R. M., Pollard, D., Tzedakis, P. C.,
de Beaulieu, J.-L., Grüger, E., and Watts, B.: European vegetation
during Marine Oxygen Isotope Stage-3, Quatern. Res., 59, 195–212,
https://doi.org/10.1016/S0033-5894(02)00016-9, 2003.
Kaplan, J. O.: Geophysical Applications of Vegetation Modeling, Department of Ecology, Lund University, Lund, 132 pp., 2001.
Kaplan, J. O., Bigelow, N. H., Prentice, I. C., Harrison, S. P., Bartlein,
P. J., Christensen, T. R., Cramer, W., Matveyeva, N. V., McGuire, A. D.,
Murray, D. F., Razzhivin, V. Y., Smith, B., Walker, D. A., Anderson, P. M.,
Andreev, A. A., Brubaker, L. B., Edwards, M. E., and Lozhkin, A. V.: Climate
change and Arctic ecosystems: 2. Modeling, paleodata-model comparisons, and
future projections, J. Geophys. Res.-Atmos., 108, 8171, https://doi.org/10.1029/2002jd002559, 2003.
Landis, J. R. and Koch, G. G.: The Measurement of Observer Agreement for
Categorical Data, Biometrics, 33, 159–174, https://doi.org/10.2307/2529310, 1977.
Levina, E. and Bickel, P.: The Earth Mover's distance is the Mallows distance: Some insights from statistics, in: Proceedings of the IEEE International Conference on Computer Vision, 2, 7–14 July 2001, Vancouver, Canada, 251–256, https://doi.org/10.1109/ICCV.2001.937632, 2001.
Marchant, R. A., Cleef, A., Harrison, S. P., Hooghiemstra, H., Markgraf, V.,
van Boxel, J., Ager, T., Almeida, L., Anderson, R., Baied, C., Behling, H.,
Berrio, J. C., Burbridge, R., Björck, S., Byrne, R., Bush, M. B.,
Duivenvoorden, J., Flenley, J. R., De Oliveira, P., Van Geel, B., Graf, K.,
Gosling, W. D., Harbele, S., van der Hammen, T., Hansen, B., Horn, S.,
Kuhry, P., Ledru, M.-P., Mayle, F. E., Leyden, B., Lozano-García, S.,
Melief, A. M., Moreno, P. I., Moar, N. T., Prieto, A., van Reenen, G.,
Salgado-Labouriau, M. L., Schäbitz, F., Schreve-Brinkman, E. J., and Wille, M.: Pollen-based biome reconstructions for Latin America at 0, 6000 and 18 000 radiocarbon years ago, Clim. Past, 5, 725–767,
https://doi.org/10.5194/cp-5-725-2009, 2009.
Marquer, L., Gaillard, M.-J., Sugita, S., Poska, A., Trondman, A.-K., Mazier, F., Nielsen, A. B., Fyfe, R. M., Jönsson, A. M., Smith, B., Kaplan, J. O., Alenius, T., Birks, H. J. B., Bjune, A. E., Christiansen, J., Dodson, J., Edwards, K. J., Giesecke, T., Herzschuh, U., Kangur, M., Koff, T., Latałowa, M., Lechterbeck, J., Olofsson, J., and Seppä, H.: Quantifying the effects of land use and climate on Holocene vegetation in
Europe, Quaternary Sci. Rev., 171, 20–37, https://doi.org/10.1016/j.quascirev.2017.07.001, 2017.
Marsland, S. J., Haak, H., Jungclaus, J. H., Latif, M., and Röske, F.: The Max-Planck-Institute global ocean/sea ice model with orthogonal curvilinear coordinates, Ocean Model., 5, 91–127, https://doi.org/10.1016/S1463-5003(02)00015-X, 2003.
Orlova, D. Y., Zimmerman, N., Meehan, S., Meehan, C., Waters, J., Ghosn, E.
E. B., Filatenkov, A., Kolyagin, G. A., Gernez, Y., Tsuda, S., Moore, W.,
Moss, R. B., Herzenberg, L. A., and Walther, G.: Earth Mover's Distance (EMD): A true metric for comparing biomarker expression levels in cell populations, PLoS ONE, 11, 1–14, https://doi.org/10.1371/journal.pone.0151859, 2016.
Overpeck, J. T., Webb III, T., and Prentice, I. C.: Quantitative interpretation of fossil pollen spectra: Dissimilarity coefficients and the
method of modern analogs, Quatern. Res., 23, 87–108,
https://doi.org/10.1016/0033-5894(85)90074-2, 1985.
Prentice, I. C. and Webb III, T.: BIOME 6000: reconstructing global
mid-Holocene vegetation patterns from palaeoecological records, J. Biogeogr., 25, 997–1005, 1998.
Prentice, I. C., Guiot, J., Huntley, B., Jolly, D., and Cheddadi, R.:
Reconstructing biomes from palaeoecological data: A general method and its
application to European pollen data at 0 and 6 ka, Clim. Dynam., 12, 185–194, https://doi.org/10.1007/BF00211617, 1996.
Prentice, I. C., Harrison, S. P., Jolly, D., and Guiot, J.: The climate and
biomes of Europe at 6000 yr BP: Comparison of model simulations and
pollen-based reconstructions, Quaternary Sci. Rev., 17, 659–668,
https://doi.org/10.1016/S0277-3791(98)00016-X, 1998.
Prentice, I. C., Jolly, D., and Participants, B.: Mid-Holocene and glacial maximum vegetation geography of the northern continents and Africa, J. Biogeogr., 27, 507–519, https://doi.org/10.1046/j.1365-2699.2000.00425.x, 2000.
R Core Team: R: A Language and Environment for Statistical Computing, R Foundation for Statistical Computing, Vienna, Austria, https://www.R-project.org/ (last access: February 2023), 2022.
Roeckner, E., Bäuml, G., Bonaventura, L., Brokopf, R., Esch, M.,
Giorgetta, M. A., Hagemann, S., Kirchner, I., Kornblueh, L., Rhodin, A.,
Schlese, U., Schulzweida, U., and Tompkins, A.: The atmospheric general
circulation model ECHAM5: Part 1: Model description, Report, MPI für
Meteorologie, 349, 1–140, https://pure.mpg.de/rest/items/item_995269/component/file_3192562/content (last access: February 2023), 2003.
Rubner, Y., Tomasi, C., and Guibas, L. J.: Earth mover's distance as a metric for image retrieval, Int. J. Comput. Vis., 50, 99–121, https://doi.org/10.1023/A:1026543900054, 2000.
Sato, H., Kelley, D. I., Mayor, S. J., Martin Calvo, M., Cowling, S. A., and
Prentice, I. C.: Dry corridors opened by fire and low CO2 in Amazonian
rainforest during the Last Glacial Maximum, Nat. Geosci., 14, 578–585,
https://doi.org/10.1038/s41561-021-00777-2, 2021.
Sawada, M., Viau, A. E., Vettoretti, G., Peltier, W. R., and Gajewski, K.:
Comparison of North-American pollen-based temperature and global lake-status
with CCCma AGCM2 output at 6 ka, Quaternary Sci. Rev., 23, 225–244,
https://doi.org/10.1016/j.quascirev.2003.08.005, 2004.
Simpson, G. L.: Analogue Methods in Palaeoecology: Using the analogue Package, J. Stat. Softw., 22, 1–29, https://doi.org/10.18637/jss.v022.i02, 2007.
Sugita, S.: Theory of quantitative reconstruction of vegetation I: pollen
from large sites REVEALS regional vegetation composition, Holocene, 17, 229–241, https://doi.org/10.1177/0959683607075837, 2007.
Tian, F., Cao, X., Dallmeyer, A., Lohmann, G., Zhang, X., Ni, J., Andreev,
A., Anderson, P. M., Lozhkin, A. V., Bezrukova, E., Rudaya, N., Xu, Q., and
Herzschuh, U.: Biome changes and their inferred climatic drivers in northern
and eastern continental Asia at selected times since 40 cal ka bp,
Veg. Hist. Archaeobot., 27, 365–379, https://doi.org/10.1007/s00334-017-0653-8, 2018.
Urbanek, S. and Rubner, Y.: emdist: Earth Mover's Distance v0.3-2, GitHub [code], https://github.com/s-u/emdist (last access: February 2023), 2022.
Wei, W. and Lohmann, G.: Simulated Atlantic Multidecadal Oscillation during
the Holocene, J. Climate, 25, 6989–7002, https://doi.org/10.1175/JCLI-D-11-00667.1, 2012.
Wei, W., Lohmann, G., and Dima, M.: Distinct Modes of Internal Variability
in the Global Meridional Overturning Circulation Associated with the Southern Hemisphere Westerly Winds, J. Phys. Oceanogr., 42, 785–801, https://doi.org/10.1175/JPO-D-11-038.1, 2012.
Wickham, H., Hester, J., and Chang, W.: devtools: Tools to Make Developing R Packages Easier, R package version 2.3.2, https://devtools.r-lib.org (last access: February 2023), 2020.
Wohlfahrt, J., Harrison, S. P., Braconnot, P., Hewitt, C. D., Kitoh, A.,
Mikolajewicz, U., Otto-Bliesner, B. L., and Weber, S. L.: Evaluation of
coupled ocean-atmosphere simulations of the mid-Holocene using palaeovegetation data from the northern hemisphere extratropics, Clim.
Dynam., 31, 871–890, https://doi.org/10.1007/s00382-008-0415-5, 2008.
Zhang, X., Lohmann, G., Knorr, G., and Xu, X.: Different ocean states and
transient characteristics in last glacial maximum simulations and implications for deglaciation, Clim. Past, 9, 2319–2333, https://doi.org/10.5194/cp-9-2319-2013, 2013.
Short summary
Data–data and data–model vegetation comparisons are commonly based on comparing single vegetation estimates. While this approach generates good results on average, reducing pollen assemblages to single single plant functional type (PFT) or biome estimates can oversimplify the vegetation signal. We propose using a multivariate metric, the Earth mover's distance (EMD), to include more details about the vegetation structure when performing such comparisons.
Data–data and data–model vegetation comparisons are commonly based on comparing single...
