摘要
本文分析八个东风波实例,按天气区域相对于700hpa东风波的槽线位置分为两类:一类坏天气区域位于槽线以西;另一类坏天气区域位于槽线以东。用热成风适应物理过程来解释这种天气区分布的原因。指出:在热带东风波区域中,若东风随高度增强的地区,基本气流的垂直切为东风,则坏天气区在槽线以西;若东风随高度减弱的地区,基本气流的垂直切变为西风,则坏天气区在槽线以东。
In this study eight cases of easterly wave were analyzed, two classes of easterly wave identified according to the weather area related to the trough lines position of easterly wave. In the first class bad weather area is situated to the west of trough lines and in the other it is situated to the east of trough lines. This distributions of weather can be explained by the adjustment physical process of thermal wind. It is shown that in the tropical easterly waves, if the easterly is intensified with increasing height, in the vertical shear of basic air flow provides easterly, then bad weather area is occurred to the west of the trough lines. If the easterly is decreased with the height, so in the vertical shear of basic air flow is westerly one the bad weather is observed to the east of the trough lines.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1990年第3期333-339,共7页
Acta Scientiarum Naturalium Universitatis Pekinensis
关键词
东风波
热成风
垂直切变
基本气流
Easterly wave
Thermal wind
Basic air flow
Vertical shear
Vortic-ity of thermal wind
