首页>>文献首页>>文献正文

The Holocene Indian monsoon variability over the southern Tibetan Plateau and its teleconnections

renchunxiao 添加于 2012/6/27 12:56:25  1523次阅读 | 0次推荐 | 0个评论

A high-resolution stalagmite oxygen isotope record from Tianmen Cave, located in the south central TibetanPlateau, characterizes detailed climatic variations between 8.7 and 4.3 ka BP on centennial and decadal time scales, with a temporal resolution of 3 to 7 years. The Tianmen record is in good agreement with speleothem records from Asian monsoon regions (i.e., Dongge Cave, [23] and [80]; Qunf Cave, Fleitmann et al., 2003), upwelling records from the Arabian Sea ( [31] and [32]) and peat bog records from southeast TibetanPlateau (Hong et al., 2003), indicating that the Indian summer monsoon (ISM) gradually weakened as Northern Hemisphere summer insolation declined during the early-mid Holocene and that ISM intensity, rather than temperature, dominates the precipitation δ18O on centennial to decadal time scales in the southern TP. On centennial to decadal time scales, the detrended Tianmen record correlates well with the Greenland ice core record, further confirming the mechanistic connection between the ISM and high northern latitude temperature changes. Meanwhile, the Tianmen record bears significant solar activity cycles, suggesting that the solar output changes may affect the variability of the ISM and likely the position of the Intertropical Convergence Zone (ITCZ) as well. Moreover, due to joint effects of changes in monsoon precipitation, moisture source and temperature, the Tianmen δ18O record shows much larger amplitude changes than speleothem δ18O records from low-elevation Asian Monsoon regions, which is similar to the previously reported Marine Isotope Stage (MIS) 5 record (Cai et al., 2010), suggesting heightened sensitivity of precipitation isotope composition to climate changes over the high-elevation regions and further demonstrating that the stable isotope lapse rate may change under different climatic conditions.

作 者:Yanjun Caia, b, , , Haiwei Zhanga, c, Hai Chengb, d, Zhisheng Ana, R. Lawrence Edwardsd, Xianfeng Wange, Liangcheng Tana, Fuyuan Liangf, Jin Wanga, c, Megan Kellyd
期刊名称: Earth and Planetary Science Letters -
期卷页: 第卷 第期 页
学科领域:地球科学 » 地理学 » 自然地理学
添加人是否为作者:
原文链接:http://www.sciencedirect.com/science/article/pii/S0012821X12002026
DOI: 10.1016/j.epsl.2012.04.035
ISBN:
关键词:
相关报道: http://paper.sciencenet.cn/htmlpaper/201262712583397725027.shtm
备 注:
文献笔记

   
导出选项:

评论 (0 个评论)

Page 1 of 1
<<<[1]>>>

举报 | Archiver | 科学网( 京ICP备07017567 )

GMT+8, 2011-2-15 11:31

Powered by ScienceNet.cn

Copyright © 2007- 科学时报社