期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 298, 期 1-2, 页码 191-198出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2010.07.041
关键词
Chinese stalagmite; Asian monsoon; bi-polar seesaw; Last Glacial Period
资金
- National Natural Science Foundation of China [40631003, 40771009, 40702026]
- U.S. National Science Foundation [0502535]
- Gary Comer Science and Education Foundation [CP41]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [0502535] Funding Source: National Science Foundation
High-resolution oxygen isotope records of three stalagmites from Sanbao (central China), Wulu (southern China) and Dashibao (southern China) Caves, based on 876 oxygen isotope measurements and 25 precise Th-230 dates, provide a detailed Asian monsoon (AM) history from 32.5 to 20.8 ka B.P., spanning the shift between Marine Isotope Stages 3 and 2. The calcite delta O-18 records, although geographically widespread (about 1000 km between them), including the previously-reported Hulu record, are similar in timing, shape, and amplitude. These observations support the idea that changes in speleothem delta O-18 largely represent variations of precipitation isotopic composition associated with large-scale summer monsoon circulation over a large portion of China. These profiles show four centennial to millennial scale strong summer monsoon events, analogous in timing and structure to Greenland Interstadials 5 through 3 (GIS 5-3). Chronology of the events refines the Hulu record and broadly supports the NGRIP GICC05 timescale. Five weak monsoon events are identified at 31.2, 30.1, 28.1, 25.7 and 24.2 ka B.P., all of which correspond to stadial events in Greenland. The 30.1 and 24.2 ka events correlate with Heinrich stadials 3 and 2. Furthermore, these events correlate to warm episodes in Antarctic ice cores, indicating that the climatic response to North Atlantic cooling is similar in China and in Antarctica, but in an opposite sense. These observations are consistent with the bi-polar seesaw hypothesis. The strong coupling between AM circulation and climate at both high latitudes at the centennial scale indicates that atmospheric circulation changes are important in transmitting abrupt climate signals globally. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据