爆发性发展台风附近次级环流的诊断分析

利用原始方程模式的Sawyer－Eliassen次级环流方程，对由5个爆发性发展的台风所合成的要素场进行了次级环流的诊断．结果表明，在各强迫项中，地转形变和非绝热加热强迫作用较大．大尺度加热主要加强中低层环沈，对流加热则主要加强中高层环流．台风爆发性发展前后，动力强迫和热力强迫的相对重要性不同．在台风爆发性发展时，非绝热加热强迫的相对重要性明显加大。

A DIAGNOSTIC RESEARCH ON SECONDARY CIRCULATION OF THE EXPLOSIVE DEVELOPMENT OF TYPHOON

The diagnosis of typhoon secondary circulation is carried out in terms of the SawyerEliassen secondary circulation euation version of the primitive equation model with the aid of the composite field of five offsea typhoons in explosive development. Results show that among all the forcing terms in the secondary circulation model, the geostrophic deformation and diabatic heating forcings have the most effects. The large-scale and convective heatings play a different role: the former (latter) strengthening the low (high) and mid level circulation, leading to the typhoon secondary circulation intensification under the joint action of the heating.