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How Well do Existing Indices Measure the Strength of the East Asian Winter Monsoon?
作者姓名:WANG Lin  CHEN Wen
作者单位:中国科学院大气物理研究所,
基金项目:The National Basic Research Program of China (973 Program)
摘    要:

关 键 词:东亚冬季风  季风强度  年际时间尺度  东亚大槽  压力对比  可预测性  气温变化  风切变指数
收稿时间:22 November 2010

How Well do Existing Indices Measure the Strength of the East Asian Winter Monsoon?
WANG Lin,CHEN Wen.How Well do Existing Indices Measure the Strength of the East Asian Winter Monsoon?[J].Advances in Atmospheric Sciences,2010,27(4):855-870.
Authors:WANG Lin and CHEN Wen
Affiliation:Center for Monsoon System research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190, Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005,Center for Monsoon System research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190
Abstract:Defining the intensity of the East Asian winter monsoon (EAWM) with a simple index has been a difficult task. This paper elaborates on the meanings of 18 existing EAWM strength indices and classifies them into four categories: low level wind indices, upper zonal wind shear indices, east-west pressure contrast indices, and East Asian trough indices. The temporal/spatial performance and prediction potential of these indices are then analyzed for the 1957--2001 period. It reveals that on the decadal timescale, most indices except the east--west pressure contrast indices can well capture the continuous weakening of the EAWM around 1986. On the interannual timescale, the low level wind indices and East Asian trough indices have the best predictability based on knowledge of the El Nino-Southern Oscillation and Arctic Oscillation, respectively. All the 18 existing indices can well describe the EAWM-related circulation, precipitation, and lower tropospheric air temperature anomalies. However, the variations of surface air temperature over large areas of central China cannot be well captured by most indices, which is possibly related to topographic effects. The results of this study may provide a possible reference for future studies of the EAWM.
Keywords:East Asian winter monsoon index  interannual variation  interdecadal variation
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