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南海夏季风活动的年际和年代际特征
引用本文:戴念军,谢安,张勇.南海夏季风活动的年际和年代际特征[J].气候与环境研究,2000,5(4):363-374.
作者姓名:戴念军  谢安  张勇
作者单位:1. 民航河北省管理局
2. 北京大学地球物理系,北京 100871
3. 民航福建省管理局
基金项目:国家科技部攀登项目A“南海季风试验研究”和国家自然科学基金资助项目49975023
摘    要:利用NCEP风场资料和候平均向外长波辐射(OLR)资料分析了南海区域低层风场与对流活动的关系,在此基础上,采用南海中南部的纬向风平均值来定义南海夏季风的爆发,确定了长序列(1949~1998)的南海夏季风爆发日期和强度指数,并研究南海夏季风活动的年际和年代际变化特征。结果表明:南海夏季风爆发日期和强度指数呈显著的反相关;50年来的气候趋势是,爆发日期逐渐偏晚,强度指数逐渐减弱。二者都存在着明显的年际和年代际变化,它们在不同阶段上的波动是各种时间尺度振荡叠加的结果,而年代际尺度具有非常重要的作用。东印度洋海温异常在南海夏季风爆发前后,均与南海夏季风强度指数呈显著的反相关。东太平洋海温异常在南海夏季风爆发之前,与强度指数反相关,而爆发之后,与强度指数正相关。这体现了南海夏季风活动与ENSO事件的密切关系。

关 键 词:南海夏季风  爆发日期  强度指数  年代际特征
修稿时间:2000年9月1日

Interannual and Interdecadal Variations of Summer Monsoon Activities over South China Sea
Dai Nianjun,Xie An and Zhang Yong.Interannual and Interdecadal Variations of Summer Monsoon Activities over South China Sea[J].Climatic and Environmental Research,2000,5(4):363-374.
Authors:Dai Nianjun  Xie An and Zhang Yong
Abstract:The relationships between wind field at low level and convection activities over the South China Sea (SCS) are investigated based on pentad wind and OLR data from NCEP. The onset time and intensity of SCS summer monsoon are determined by area-averaged zonal wind component over central and south SCS. So we possess long-term time sequence of SCS summer monsoon activities for the period of 1949~1998. Interannual and interdecadal variations are examined by using this time series. The results show that onset time of SCS summer monsoon is significantly negative related with its intensity. Climatic tendency for 50-year manifests that the onset date of SCS summer monsoon gradually gets delayed and its intensity gets weak. Both of them displays considerable interannual and interdecadal variability, they are the results that many waves interact on a wide range of timescales, among them do interdecadal timescale waves play important roles. Whether before SCS summer monsoon bursts or not, the correlation between surface sea temperature anomalies (SSTA) over the East Indian Ocean and intensity index of SCS summer monsoon are remarkably negative. However, the correlation of SSTA over the East Pacific with SCS summer monsoon intensity index is negative before onset, but after onset their correlation become positive. These reflect that SCS summer monsoon activities have close relationships with ENSO events.
Keywords:South China Sea summer monsoon  onset date  intensity index  interdecadal feature
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