Atmospheric circulation change in the central Himalayas indicated by a high-resolution ice core deuterium excess record
Atmospheric circulation change in the central Himalayas indicated by a high-resolution ice core deuterium excess record
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DOI：
10.3354/cr01090
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发表时间：
2012-05
期刊：
影响因子：
1.1
通讯作者：
H. Pang;S. Hou;S. Kaspari;P. Mayewski;D. Introne;V. Masson‐Delmotte;J. Jouzel;Zhenchao Li;Yuanqing He;Sungmin Hong;D. Qin
中科院分区：
文献类型：
--
作者：
H. Pang;S. Hou;S. Kaspari;P. Mayewski;D. Introne;V. Masson‐Delmotte;J. Jouzel;Zhenchao Li;Yuanqing He;Sungmin Hong;D. Qin
对采自东绒布冰川的一个108.8 m冰芯进行了沿着连续的δD和δ 18 O测量。珠穆朗玛峰（珠峰）（28.03° N，86.96° E，海拔6518米），2002年9月。它们提供了喜马拉雅山脉中部氘过量（d）的第一个高分辨率历史记录。本文着重研究了1951 - 2001年d的变率及其与大尺度大气环流的关系。d记录具有显着的季节变化，夏季低值和冬季高值，反映了冬季西风带和印度夏季风（ISM）之间的大气环流转变。d的年际变化主要受ISM水汽输送的控制。1960-1964年d值异常偏高与冬季西风带加强有关，而1965- 1968年d值异常偏低主要是ISM水汽源区迁移的结果，其次是地面升华的结果。结果表明，高喜马拉雅地区的冰芯d记录是一个很好的大气环流变化的代用指标。
Continuous measurements of both δD and δ18O were performed along a 108.8 m ice core recovered from the East Rongbuk Glacier on the northeast saddle of Mt. Qomolangma (Everest) (28.03° N, 86.96° E, 6518 m above sea level) in September 2002. They provide the first highresolution historical record of deuterium excess (d) in the central Himalayas. In this paper, we focus on d variability from 1951 to 2001 and its relationship with large scale atmospheric circulation. The d record exhibits significant seasonal variations, with low values in summer and high values in winter, reflecting the atmospheric circulation shift between winter westerlies and the Indian summer monsoon (ISM). The interannual d variation is primarily controlled by the ISM moisture transport. An abnormally high d value during the period 1960–1964 is linked with the strengthening of winter westerlies, while an anomalously low d value during the period 1965– 1968 is primarily a result of the migration of the ISM moisture source region, and secondly of surface sublimation. The results show that the ice-core d record retrieved from the high Himalayas is a good proxy for changes in atmospheric circulation.