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Variability of stalagmite-inferred Indian monsoon precipitation over the past 252,000 y.

ABSTRACT: A speleothem ?(18)O record from Xiaobailong cave in southwest China characterizes changes in summer monsoon precipitation in Northeastern India, the Himalayan foothills, Bangladesh, and northern Indochina over the last 252 kyr. This record is dominated by 23-kyr precessional cycles punctuated by prominent millennial-scale oscillations that are synchronous with Heinrich events in the North Atlantic. It also shows clear glacial-interglacial variations that are consistent with marine and other terrestrial proxies but are different from the cave records in East China. Corroborated by isotope-enabled global circulation modeling, we hypothesize that this disparity reflects differing changes in atmospheric circulation and moisture trajectories associated with climate forcing as well as with associated topographic changes during glacial periods, in particular redistribution of air mass above the growing ice sheets and the exposure of the "land bridge" in the Maritime continents in the western equatorial Pacific.

SUBMITTER: Cai Y 

PROVIDER: S-EPMC4364182 | biostudies-literature | 2015 Mar

REPOSITORIES: biostudies-literature

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Variability of stalagmite-inferred Indian monsoon precipitation over the past 252,000 y.

Cai Yanjun Y   Fung Inez Y IY   Edwards R Lawrence RL   An Zhisheng Z   Cheng Hai H   Lee Jung-Eun JE   Tan Liangcheng L   Shen Chuan-Chou CC   Wang Xianfeng X   Day Jesse A JA   Zhou Weijian W   Kelly Megan J MJ   Chiang John C H JC  

Proceedings of the National Academy of Sciences of the United States of America 20150223 10

A speleothem δ(18)O record from Xiaobailong cave in southwest China characterizes changes in summer monsoon precipitation in Northeastern India, the Himalayan foothills, Bangladesh, and northern Indochina over the last 252 kyr. This record is dominated by 23-kyr precessional cycles punctuated by prominent millennial-scale oscillations that are synchronous with Heinrich events in the North Atlantic. It also shows clear glacial-interglacial variations that are consistent with marine and other terr  ...[more]

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