北半球500hPa3—5年周期的初步研究  

A PRELIMINARY STUDY OF 3—5 YEAR CYCLE OVER 500hPa HEIGHT FIELD IN THE NORTHERN HEMISPHERE

作　　者：林学椿 

机构地区：[1]国家气象局气象科学研究院

出　　处：《应用气象学报》1990年第2期169-176,共8页Journal of Applied Meteorological Science

摘　　要：本文用带通时间滤波器,对北半球500hPa 高度距平(从1951年1月—1986年12月共432个连续月)的每个格点的时间序列进行滤波计算,初步结果如下:1.北半球500hPa 普遍存在3—5年周期,该周期的相对方差都在30%以上。35°N 以南相对方差可达50%以上,在太平洋、大西洋、欧亚低纬地区最大相对方差高于70%。2.3—5年周期的水平结构要比 Wallace 的遥相关型更具有波列结构,通过波列的射线路径可以把能量从低纬度频散到高纬度。3.从分析1982/1983 El Nino 年个例可以看到,赤道东太平洋海水异常增暖对大气的影响,除了一般公认的通过 PNA 型影响北美外,可能还存在另一条路径。In the paper,the time series of 500 hPa height departure field from January 1951 to Decem-ber 1986 are calculated by using a band-pass filter at all grid points in the northern Hemisphere.The preliminary results are as follows:1.There exists a 3—5 year cycle for 500 hPa height field in the northern Hemisphere.Therelative variance are over 30% in the northern Hemisphere and 50% to the south of 35°N lati-tude.The maximun relative variances in the Pacific,Atlantic and Eurasia low latitute areas aremore than 70%。2.The 3—5 year cycle is provided with more obvious construction of wavetrain than wal-lace's teleconnection types.The atmospheric energy is transfered by dispersing from low latitudeto high latitude along ray path of the wavetrains.3.From the filtered 500 hPa height departure field during 1982/1983 E1 Nino event,it isfound that in response of atmospheric circulation to the tropical Pacific SST anomaly forcing,there may be another path,in addition to the PNA teleconnection type.

关 键 词：Pa3 年周期 赤道东太平洋 遥相关 距平 频散 射线路径 水异常 相对方 位势高度 

分 类 号：P4[天文地球—大气科学及气象学]