Glacial events during the last glacial termination in the Pagele valley, Qiongmu Gangri peak, southern Tibetan Plateau, and their links to oceanic and atmospheric circulation

During the last glacial termination, a warming trend was generally interrupted by rapid millennium-scale cold reversals, such as the Greenland (Isotope) Stadial 1 (GS-1) and GS-2a events. To understand how glaciers on the Tibetan Plateau (TP) responded to these rapid climate events, this study const...

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Bibliographic Details
Published in:Quaternary Research
Main Authors: Xu, Xiangke, Yao, Tandong, Xu, Baiqing, Yi, Chaolu, Sun, Yong, Zeng, Xuezhen, Dong, Guocheng, Pan, Baolin
Format: Report
Language:English
Published: CAMBRIDGE UNIV PRESS 2020
Subjects:
Last glacial termination
Glacial event
Cosmogenic Be-10 dating
Millennium-scale climate events
Pagele valley
NUCLIDE PRODUCTION-RATES
INDIAN-SUMMER MONSOON
CLIMATE-CHANGE
EXPOSURE AGES
QUATERNARY GLACIATION
BE-10
MAXIMUM
PRECIPITATION
MOUNTAINS
RECORD
Physical Geography
Geology
Geography
Physical
Geosciences
Multidisciplinary
Greenland
Indian
North Atlantic
Online Access:http://ir.ieecas.cn/handle/361006/13970
http://ir.ieecas.cn/handle/361006/13971
https://doi.org/10.1017/qua.2020.7
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Summary:During the last glacial termination, a warming trend was generally interrupted by rapid millennium-scale cold reversals, such as the Greenland (Isotope) Stadial 1 (GS-1) and GS-2a events. To understand how glaciers on the Tibetan Plateau (TP) responded to these rapid climate events, this study constrained the timing and extent of three glacial events during the late-glacial period. Specifically, using a cosmogenic Be-10 exposure dating method, we dated three prominent glacial moraines (PM1, PM2, PM3) back to 15,850 +/- 980, 14,140 +/- 880, and 12,430 +/- 790 yr in the Pagele valley, southern TP, corresponding to GS-2a, Greenland Interstadial 1 (GI-1), and GS-1, respectively. By simulating glacial extents forced by different climate scenarios, the study constrained the temperature decreases relative to present to be 2.6 degrees C-2.9 degrees C, similar to 1.6 degrees C, and 1.4 degrees C-1.5 degrees C during the GS-2a, GI-1, and GS-1 periods in the region, with precipitation values of 60%-80%, similar to 100%, and 80%-90% of present value, respectively. Considering information from oceanic and atmospheric circulation, the study suggested that on the TP, the glacial events during the last glacial termination were well connected with the millennium-scale climate events in the North Atlantic region through the westerlies, while the Indian summer monsoon played a positive role in sustaining the glaciers under the warming climate trend.

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