暖池区海温异常影响夏季大气环流低频变化的数值试验个例分析
投稿时间:1995-01-13  修订日期:1995-08-10  点此下载全文
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作者单位
管兆勇 南京气象学院气象学系, 南京 210044 
朱乾根 南京气象学院气象学系, 南京 210044 
基金项目:国家自然科学基金49135120
中文摘要:使用 IAP 2—L AGCM(中科院大气物理研究所2层大气环流模式),就西太平洋暖池区海温异常影响夏季大气环流和季风低频变化的问题进行了数值试验研究。结果表明,暖池区海温正异常可引起大气环流低频变化的明显改变,使海平面气压低频方差在季风区增强;对流层中上层气温之低频信号增强;改变低频扰动的空间型;更清楚地显示出自暖池区向北排列的波列;改变低频振荡的位相(时间域上);使南半球低频变化的向北传播(至北半球)更为清楚。
中文关键词:暖池区海温异常  夏季环流  季风  低频变化  数值试验
 
NUMERICAL STUDY ON WARMING POOL SSTA INFLUENCE ON GENERAL CIRCULATION LFO IN SUMMER
Abstract:In the context of the 2-L AGCM of Institute of Atmospheric Physics,Academia Sinica,numerical study is performed on the influence of the western Pacific warming pool(WPWP) upon summer general circulation and monsoon LFO.Evidence suggests that the WPWP SSTA gives rise to great change in the atmospheric circulation LFO,resulting in enhancement of lowfrequency variance of sea level pressure in the monsoon region,intensification of low-frequency signal of temperature variation in the mid-upper troposphere,modification in the space pattern of low-frequency disturbance,displaying more clearly a wavetrain ranging north out of the WPWP, change in LFO phase(time domain)and revealing even more evidently the cross-equatorial propagation of low-frequency variation from the Southern Hemisphere.
keywords:numerical study  warming pool  summer monsoon  summer circulation  monsoon low-frequency oscillation(LFO)
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