Comparison of simulated and reconstructed paleotemperatures during the last glacial maximum in Northern Eurasia
https://doi.org/10.55959/MSU0579-9414-5-2022-6-40-48
Abstract
The study deals with comparative analysis of independent reconstructions of temperature regime during the cold period of the largest in the Russian Arctic Late Pleistocene glaciation (18–21 kyr BP), based on the data of isotopic analysis and the results of numerical modeling. The study used the data of numerical experiments of PMIP3 climatic models of the Earth system, and the results of temperature reconstruction based on the isotopic composition of syngenetic ice wedges (δ18O). It is shown that in some areas there are significant differences in temperatures reconstructed from the isotope data and obtained from the modeling data. In particular, it was found that the difference in simulated and reconstructed temperatures decreases with distance from the hypothetic ice sheet, which allows concluding that the accuracy of the ice sheet location in the models is significant for the final simulation results.
In particular, different approaches in paleoclimatic studies lead to rather different estimates of the area of continental and shelf ice of the epoch. The area of glaciers and their properties are taken into account in climate models in the process of calculations. Our investigation shows that high-quality modeling definitely requires refining the paleoreconstructions based on proxy climate data.
Keywords
Late Pleistocene glaciation,
air temperature,
cold season,
Arctic,
isotopic and model reconstructions
Supporting agencies: The study was financially supported by the Russian Science Foundation (project no. 19-17-00126) and carried out under the MSU Interdisciplinary Scientific and Educational School “Future of the Planet and Global Environment Changes” and the state assignment (CITIS number: АААА-А16-116032810086-4). Special thanks to A.A. Krylov for his assistance in data pre-processing.
About the Authors
G. V. Surkova
Lomonosov Moscow State University, Faculty of Geography
Russian Federation
Russian Federation
Department of Meteorology and Climatology, Professor, D.Sc. in Geography
Yu. K. Vasil’chuk
Lomonosov Moscow State University, Faculty of Geography
Russian Federation
Russian Federation
Department of Landscape Geochemistry and Soil Geography, Professor, Dr.Sc. in Geology and Mineralogy
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For citations:
Surkova G.V., Vasil’chuk Yu.K. Comparison of simulated and reconstructed paleotemperatures during the last glacial maximum in Northern Eurasia. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2022;(6):40-48. (In Russ.) https://doi.org/10.55959/MSU0579-9414-5-2022-6-40-48
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