Responses to rapid warming at Termination 1a at Gerzensee (Central Europe) : primary succession, albedo, soils, lake development, and ecological interactions

• Published in: Palaeogeography, Palaeoclimatology, Palaeoecology
• Main Authors: Ammann, B., van Raden, U., Schwander, J., Eicher, U., Gilli, A., Bernasconi, S.M., van Leuwen, J., Lischke, H., Brooks, S., Heiri, O., Novakova, K., van Hardenbroek, M.R., von Grafenstein, U., Belmecheri, S., van Der Knaap, W.O., Magny, M., Eugster, W., Colombaroli, D., Nielsen, E., Tinner, W., Wright, H.E.
• Other Authors: Oeschger Centre for Climate Change Research (OCCR), Universität Bern / University of Bern (UNIBE), Institute of Plant Sciences, Geologisches Institut ETH Zürich, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich), Institute of Applied Physics Bern (IAP), Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Department of Entomology London, The Natural History Museum London (NHM), Geography and Environment, University of Southampton, Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Géochrononologie Traceurs Archéométrie (GEOTRAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Institut de Paléontologie Humaine (IPH), Fondation I.P.H-Centre National de la Recherche Scientifique (CNRS), Laboratoire de chrono-écologie - CNRS (UMR6565) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC), University of Minnesota Twin Cities (UMN), University of Minnesota System (UMN)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2013
• Subjects: [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Greenland; NGRIP; Tundra
• Online Access: https://hal.science/hal-01079967; https://doi.org/10.1016/j.palaeo.2013.11.009

International audience The transition from the Oldest Dryas to the Bølling around 14,685 cal yr BP was a period of extremely rapid climatic warming. From a single core of lake marl taken at Gerzensee (Switzerland) we studied the transition in stable isotopes of oxygen and carbon on bulk sediment and charophyte remains, as well as on monospecific samples of ostracods, after Pisidium a; in addition pollen, chironomids, and Cladocera were analyzed. The δ18O record serves as an estimate of mean air temperature, and by correlation to the one from NGRIP in Greenland it provides a timescale.The timing of responses: The statistically significant zone boundaries of the biostratigraphies are telescoped at the rapid increase of about 3‰ in δ18O at the onset of Bølling. Biotic responses may have occurred within sampling resolution (8 to 16 years), although younger zone boundaries are less synchronous. Gradual and longer-lasting responses include complex processes such as primary or secular succession. During the late-glacial interstadial of Bølling and Allerød, two stronger and two weaker cool phases were found.Biological processes involved in the responses occurred on levels of individuals (e.g. pollen productivity), of populations (increases or decreases, immigration, or extinction), and on the ecosystem level (species interactions such as facilitation or competition).Abiotic and biotic interactions include pedogenesis, nitrogen-fixation, nutrient cycling, catchment hydrology, water chemistry of the lake and albedo (controlled by the transition from tundra to forest).For the Swiss Plateau this major change in vegetation induced a change in the mammal fauna, which in turn led to changes in the tool-making by Paleolithic people.