亚洲东西季风区之间的能量交换及其周期振荡
投稿时间:1984-09-06  修订日期:1984-11-05  点此下载全文
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作者单位
朱乾根  
王信  
中文摘要:本文应用1982年8—9月的气象资料,分析计算了亚洲东部的南海季风区和华北季风区与其西部的印度季风区和高原季风区之间的能量交换及其周期振荡。高原季风区向华北季风区输送各种能量,南海季风区向印度季风区输送感热能、位能和动能,主要是从高层输送的。值得注意的是印度季风区向南海季风区净输送潜热能,主要是由低层西南季风输送的,虽然其数量相对地较小,但对于季风降水却是重要因素。南部季风区能量通量的主要振荡周期较北部季风区长,前者为准双周和准四周,后者为准双周和准三周。高层的振荡周期长于低层,准单周振荡主要出现在低层。同一主要振荡周期,高、低层的初始位相有差异,这种位相差可能是造成强对流天气周期性出现的重要原因。
 
ENERGY EXCHANGE BETWEEN THE EASTERN AND WESTERN MONSOON REGIONS IN ASIA DURING SUMMER AND ITS OSCILLATION
Abstract:Through using the aerological data of August-September,1982,the energy exchange and its oscillation between the eastern and western monsoon regions in Asia are calculated and analyzed. It is found that various kinds of energy are transported from the plateau monsoon region to the North China monsoon region whereas sensible heat,potential and kinetic energy are transported from South China Sea monsoon region to Indian monsoon region. These transports primarily take place in the upper troposphere. It is worthy to note that latent energy,though small in amount,is transported mainly by the low-level southwesterlies from Indian monsoon region to South China Sea,and it is an important factor for the monsoon rainfall. The predominant oscillation periods of the energy flux in the two southern monsoon regions are longer than the two northern monsoon regions,being about two weeks and four weeks for the former and about two weeks and three weeks for the latter. The oscillation period at upper level is longer than at lower level,with the weekly oscillation mainly occurring at the lower levels. Difference in initial phase may exist between the upper and lower levels even though the periods are identical. This phase lag is probably an important cause of periodic occurrence of strong convective weather.
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