夏季低纬地区散度风分量准40天振荡的观测研究  

AN OBSERVATIONAL STUDY ON 40 DAY OSCILLATION OF DIVERGENT MOTION IN THE LOWER LATITUDES DURING THE SUMMER 1982

作　　者：章基嘉 吴洪宝 

机构地区：[1]国家气象局

出　　处：《气象科学》1991年第1期1-10,共10页Journal of the Meteorological Sciences

摘　　要：本文用ECMWF逐日资料分析了1982年夏季30°S—30°N纬带散度风分量Vx准40天振荡的空间分布和传播特点。结果表明:整个纬带振荡周期长度比较一致;高低层间反位相,辐散与辐合相反配置;强度分布有明显地域性,季风区最强,850和200hPa上振幅分别是1和2m/s左右,亦道附近110°W两侧(?)x有分别向东西两个方向传播的现象。The ECMWF daily data during the summer 1982 is used to analyse the characters of spatial distribution and propagation of 40 day oscillation of divergent wind Vx in a zonal belt (30 S-30 N). The results indicate that the time scale of the oscillation periods in the zonal belt is consistent. The phases of the oscillaton at the upper and at the lower levels are inverse in divergent fields. The spatial distribution of intensity exibits a distinct difference. The maximum intensity occures over monsoon regions, and the amplitudes of the divergent wind at 850 and 200 mPa are 1 and 2 m/s respectively. There are the eastwards and the westwards propagations of Vx from 110 W near the Equator.

关 键 词：夏季 低纬地区 散度风 振荡 分量 

分 类 号：P425.42[天文地球—大气科学及气象学]