摘要
早在本世纪初,人们就已发现大气环流存在遥相关现象。Wallace等从北半球冬季500hPa月平均高度场总结出5种遥相关型。理论研究和数值模拟表明遥相关型是正压不稳定及Rossby波在球面上频散的反映。由于Rossby波频散是定性估计大型环流中期变化趋势的基本思路及500hPa候平均图是中期预报的基本工具,因此,分析500kPa候平均高度场的遥相关是有意义的。
In this paper, the teleconnections of 5-day averaged 500 hPa height field in northern hemisphere winter are analysed, and six teleconnection patterns are summed up. The Pacific/Northern America (PNA), Western Pacific (WP) and Western Atlantic (WA) pattern are same as the teleconnection patterns of monthly averaged 500 hPa height field suggested by Wallace. The Atlantic/ Eurasia pattern (AEA) and it's subpattern (AEAS) are consistent with the propagations of the barotropical Rossby wave of wave number 3 and wave number 5 in spherical surface. The teleconnection of southeastern Asia pattern (SEA) may be related to the response of high latitude circulation to the low latitude forcing as shown by some numerical simulations.
出处
《气象学报》
CSCD
北大核心
1989年第4期488-492,共5页
Acta Meteorologica Sinica
