利用多层非线性平衡ω方程、湿静力稳定度倾向方程以及水汽通量散度方程诊断分析了"91.7"梅雨锋横向次级环流稳定维持的原因。结果发现,稳定性凝结加热的正反馈对横向次级环流的维持起了重要作用。

In this paper, the multi-level nonlinear balanced ω-equation, the tendency equation of moist static stability and the equation of vapour-flux divergence are used to study the persistent cause of the transversal secondary circulation of Mei-Yu front in July 1991.The results show that the positive feedback of stable condensation heating play an important part.