非绝热加热对江淮气旋影响的数值模拟

NUMERICAL SIMULATION OF INFLUENCE OF DIABATIC HEATING ON EXTRATROPICAL CYCLONE IN THE EAST COAST OF CHINA

本文采用数值模拟方法考察了潜热、感热和水汽蒸发等诸因素对江淮气旋的影响。对各种试验进行了涡度平衡与能量平衡的诊断分析,结果表明:江淮气旋初生时,扰动从基本气流中获得能量,正压不稳定起着重要作用;在江淮气旋发展后期,斜压性比较明显。潜热释放有意义地修正了系统的相速,一定程度上加强了系统的强度。海上感热和水汽蒸发促进了深对流发展,加大降水,同时加强了有效位能的释放,从而加强了系统发展,但它们的作用是有阶段性的。

We did numerical simulation in order to understand the influence of diabatic heating, such as latent heat, sensible heat and water vapor transpiration over the sea . On the development of the cyclone in the east coast of China, we diagnosed the budgets of vorticity and energy for various experimental schemes. The results show that at the initial stage of cyclogenesis , perturbation energy comes from mean flow; at the mature stage of the cyclone , baroclinicity plays an important role in the development of the cyclone . Latent heat released by precipitation modifies phase speed of the system and deepenes the depression . When the cyclone moves on the sea , sensible heat and water vapor transpiration promote deep convection.