Orbital and Millennial-Scale Climate Variability over the Past 76 ka in the Western Tarim Basin, Northwest China

Paleoclimate changes during the last glacial in the arid central Asia are not as well understood as the monsoon-dominated areas of Asia. Here we report a 75-m-long sediment core over past 120 kyr based on astronomical tuning combined with the optically stimulated luminescence (OSL) dating in the Kas...

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Bibliographic Details
Published in:Journal of earth science (Wuhan, China) China), 2023-02, Vol.34 (1), p.173-180
Main Authors: Zhang, Rui, Yin, Qiuzhen, Nai, Weihua, Wang, Zhixiang, Lu, Hao, Huang, Chunju, Gu, Yansheng, Li, Lin, Wang, Yusong, Liu, Linjing
Format: Article
Language:English
Subjects:
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Biogeology and Environmental Geology
Biogeosciences
Boreholes
Climate change
Climate variability
Earth and Environmental Science
Earth Sciences
Gamma rays
Geochemistry
Geology
Geotechnical Engineering & Applied Earth Sciences
Glacial periods
Grain size
Hydrologic cycle
Hydrological cycle
Hydrology
Ice ages
Loess
Monsoons
Ocean-atmosphere system
Paleoclimate
Temperature
Variability
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Summary:Paleoclimate changes during the last glacial in the arid central Asia are not as well understood as the monsoon-dominated areas of Asia. Here we report a 75-m-long sediment core over past 120 kyr based on astronomical tuning combined with the optically stimulated luminescence (OSL) dating in the Kashi depression of the western Tarim Basin, Northwest China. Analysis of grain size and highresolution gamma ray (GR) logs from the KT11 borehole across the last glacial period yields a climate history for the Tarim Basin which reflects the variations of its temperature and the hydrological cycles. Comparison of these records with north hemisphere summer insolation, the Greenland ice core temperature, stalagmites and the loess from the nearby region indicates that the deposits in the fluvio-lacustrine system of the Kashi depression responded to climate change at the Younger Dryas (YD), six Heinrich cooling events and the Dansgaard-Oeschger cycles. Our work indicates that the alternations between warm-humid and cold-dry climates were prevalent in the western Tarim Basin during the last glacial period, showing an in-phase pattern with the climate variations of the East Asian Monsoon, controlled ultimately by precession and North Atlantic Ocean climate variability on orbital-millennial time scales.
ISSN:1674-487X
1867-111X
DOI:10.1007/s12583-020-1115-2