东亚季风区大气季节内振荡经向与纬向传播特征分析  

The Relay Character Analysis of the Zonal and Longitudinal Propagations of the Atmospheric Intraseasonal Oscillation in the East Asian Monsoon Region

作　　者：琚建华[1] 孙丹[2] 吕俊梅[3] 

机构地区：[1]中国气象局培训中心,北京100081 [2]云南大学大气科学系,昆明650091 [3]中国气象科学研究院,北京100081

出　　处：《大气科学》2008年第3期523-529,共7页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展规划项目2004CB418302;国家自然科学基金资助项目40675056

摘　　要：将NECP/NCAR资料中850 hPa纬向风分量进行30~60天带通滤波,研究东亚季风区大气季节内振荡的传播特征。分析表明,夏季东亚季风区大气季节内振荡（ISO）的传播分为经向传播和纬向传播,其中经向传播主要为热带地区ISO的向北传播,纬向传播则是分别起源于印度季风区的ISO东传和起源于西太平洋海域的ISO西传。东传和西传的ISO在120°E附近汇合后增强自热带地区北传到此的ISO,使得ISO在经向上可以继续向北传播,其最北界可达35°N以北,并对我国长江中下游地区夏季降水产生一定的影响。The NCEP/NCAR 850-hPa zonal wind reanalysis data are calculated by using the band-pass filter to study the propagating characters of the atmospheric intraseasonal oscillation （ISO） in the East Asian monsoon region. The results show that the propagations of the atmospheric ISO in the East Asian monsoon region in summer include zonal propagation and longitudinal propagation. The longitudinal propagations mainly transfer from the tropical region northward, and the zonal propagations involve the eastward propagation coming from the Indian monsoon region and the westward propagation coming from the western Pacific area. These two ISO zonal propagations will converge at 120~E, and then reinforce the ISO which propagates northward here. This reinforcement can make the ISO keep on propagating northward and its north boundary may arrive at 35°N, even more further north. It will have some influence on the summer precipitation in the mid to lower reaches of the Yangtze River.

关 键 词：东亚夏季风 季节内振荡 经向传播 纬向传播 补充特征 

分 类 号：P461[天文地球—大气科学及气象学]