High Latitude Impacts on Deglacial CO_\textrm2 : Southern Ocean Westerly Winds and Northern Hemisphere Permafrost Thawing

• Main Authors: Köhler, Peter, Völker, Christoph, Knorr, Gregor, Bard, Edouard
• Other Authors: Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Collège de France - Chaire Evolution du climat et de l'océan, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2015
• Subjects: 2HAL; BARD Édouard; Chaires; Preprint/postprint du document; traité; web-evolution-climat-ocean; [SDV.EE.BIO]Life Sciences [q-bio]/Ecology; environment/Bioclimatology; Southern Ocean; Ice; permafrost; Sea ice
• Online Access: https://hal.science/hal-03772457

https://epic.awi.de/id/eprint/37718/ Climate in the high latitudes changed massively during the last deglaciation. Temperature rose due to the polar amplification more than twice as much as in the global mean leading predominately to the shrinking of various parts of the cryosphere: decline of northern hem- ispheric (NH) land ice sheets and permafrost thawing, and a reduction in sea ice extent in both hemispheres. It is thus a rather natural choice to also analyse how changes in these polar regions might influence the global carbon cycle and atmospheric CO2. Here we use carbon cy- cle models to analyse two examples of the impact of high latitude climate change on deglacial CO2: (i) changes in the position of the westerly winds in the Southern Ocean during the Last Glacial Maximum (LGM) (based on Völker and Köhler 2013); (ii) Northern Hemisphere permafrost thawing at the onset of the Bølling/Allerød (B/A) around 14.6 ka ago (based on Köhler et al. 2014).