Hydroclimatic changes on multiple timescales since 7800 y BP in the winter precipitation–dominated Central Asia

石笋 降水 全新世 气候学 干旱 西风带 古气候学 气候变化 句号(音乐) 中亚 地理 自然地理学 环境科学 地质学 海洋学 考古 气象学 古生物学 物理 声学
作者
Liangcheng Tan,Hai Cheng,Dong Li,Rustam Orozbaev,Yanzhen Li,Hai Xu,R. Lawrence Edwards,Yougui Song,Le Ma,Fangyuan Lin,Ashish Sinha,Zhisheng An
出处
期刊:Proceedings of the National Academy of Sciences of the United States of America [National Academy of Sciences]
卷期号:121 (14) 被引量:5
标识
DOI:10.1073/pnas.2321645121
摘要

Central Asia (CA) is one of the world’s most significant arid regions, which is markedly impacted by global warming. A better understanding of the dynamical processes governing its Holocene climate variability is critical for a better understanding of possible future impacts of climate change in the region. To date, most of the existing CA paleoclimate records are from the summer precipitation–dominated eastern CA (ECA), with few records from the winter precipitation–dominated western CA (WCA). Here, we present a precisely dated (~6‰) and highly resolved (<4-y) record of hydroclimatic variations from the WCA covering the period between 7,774 and 656 y BP. Utilizing multiple proxies (δ 18 O, δ 13 C, and Sr/Ca) derived from a stalagmite from the Fergana Valley, Kyrgyzstan, we reveal a long-term drying trend in WCA, which is in contrast with the wetting trend in ECA. We propose that different responses of winter and summer westerly jets to seasonal solar insolation over the past 8,000 y may have resulted in an antiphased precipitation relationship between the WCA and ECA. Our data contain dominant quasiperiodicities of 1,400, 50 to 70, and 20 to 30 y, indicating close connections between the WCA climate and the North Atlantic. We further identified a series of droughts and pluvials on centennial-to-decadal timescales, which may have influenced regional societies and trans-Eurasian culture exchanges during historical and prehistorical times.
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