Low-frequency of southern Asian monsoon variability using a 295-year record from the Dasuopu ice core in the central Himalayas
Low-frequency of southern Asian monsoon variability using a 295-year record from the Dasuopu ice core in the central Himalayas
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DOI：
10.1029/2004gl020015
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发表时间：
2004-08-25
影响因子：
5.2
通讯作者：
Thompson, LG
中科院分区：
文献类型：
--
作者：
Duan, KQ;Yao, TD;Thompson, LG
更好地了解喜马拉雅地区降雨的时空变异性对于提高我们对亚洲季风动力学的理解是极其重要的。在海拔超过7000米的喜马拉雅高海拔地区，人们对降雨量的变化知之甚少。这里，来自喜马拉雅中部的一个年代久远的大索普冰芯的高分辨率积雪记录反映了过去295年季风降水的低频变化。1901-1995年期间，大索普积雪（DSA）的多年代际至百年代际变化与印度东北部、尼泊尔和孟加拉国（印度南部）的季风降水呈同（非）相变化。记录显示，喜马拉雅山中部的季风在18世纪减弱，在19世纪和20世纪初的大部分时间里增强，然后从20世纪20年代初到现在再次减弱。
A better understanding of the spatial and temporal variability of rainfall in the Himalayas should be extremely important to improve our understanding of Asian monsoon dynamics. There is little that is understood about rainfall variability at the high Himalayas with elevation over 7000 m a.s.l. Here a high-resolution snow accumulation record from a well dated Dasuopu ice core from central Himalayas reflects low-frequency variability of monsoon precipitation over the last 295-year. MultiDecadal to centennial variations in the Dasuopu snow accumulation (DSA) are in-phase (out-of-phase) with that in monsoon rainfall of northeast Indian, Nepal and Bangladesh (southern India) over the period 1901-1995. The record shows the monsoon in central Himalayas had weakened in 18th century and strengthened throughout much of 19th and early 20th century, and then weakening again from early 1920s to the present.