Drivers for Asynchronous Patterns of Dust Accumulation in Central and Eastern Asia and in Greenland During the Last Glacial Maximum

We collected 143 loess optically stimulated luminescence (OSL) ages between 10 ka and 30 ka from Central Asia (CA), and analyzed their probability density functions (PDFs). The PDFs show dust accumulation was greater during the late Last Glacial Maximum (LGM) (23-19 ka) than that during the early LG...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Cheng, Liangqing, Song, Yougui, Wu, Yubin, Liu, Yonggang, Liu, Huifang, Chang, Hong, Zong, Xiulan, Kang, Shugang
Format: Report
Language:English
Published: AMER GEOPHYSICAL UNION 2021
Subjects:
dust accumulation
Last Glacial Maximum
obliquity
precession
Siberian High
westerlies
CHINESE LOESS
MINERAL-DUST
ICE CORE
WINTER MONSOON
GRAIN-SIZE
MIS 2
CLIMATE
INSOLATION
VARIABILITY
INSIGHTS
Geology
Geosciences
Multidisciplinary
Greenland
ice core
Online Access:http://ir.ieecas.cn/handle/361006/16209
https://doi.org/10.1029/2020GL091194
Description
Summary:We collected 143 loess optically stimulated luminescence (OSL) ages between 10 ka and 30 ka from Central Asia (CA), and analyzed their probability density functions (PDFs). The PDFs show dust accumulation was greater during the late Last Glacial Maximum (LGM) (23-19 ka) than that during the early LGM (26.5-23 ka). The temporal variability of dust accumulation of CA loess is generally similar to that of Chinese Loess Plateau (CLP) loess, following precession. In contrast, dust accumulation in Greenland was stronger during the early LGM than that during the late LGM, following obliquity. Supported by numerical modeling experiments and our newly dating OSL ages, we conclude dust accumulation in CA and CLP during the LGM was controlled by Siberian High forced by precession, while dust accumulation in Greenland was closely related to both intensity of summer westerlies forced by obliquity, and to intensity of dust emissions at source forced by precession.

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