期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 112, 期 10, 页码 2954-2959出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1424035112
关键词
Indian summer monsoon; stalagmite; delta O-18; precipitation; glacial-interglacial
资金
- National Natural Science Foundation of China grants
- National Basic Research Program of China
- Knowledge Innovation Program of the Chinese Academy of Sciences
- National Science Foundation [EAR-0909195, EAR-1211925, EAR-0908792, EAR-1211299]
- Taiwan Ministry of Science and Technology Grant [MOST-103-2119-M-002-022]
- Singapore National Research Foundation fellowship
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1103403] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1211299] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1211925] Funding Source: National Science Foundation
A speleothem delta O-18 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.
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