Geostrophic adjustment and frontogenesis 地轉(zhuǎn)適應(yīng)與鋒生
Analyzing the physics structure of vorticity , divergence , vertical velocity , frontogenesis " function , apparent heat source and apparent moist sink etc . indicated the physics fields are favorable for the occurance of the heavy rain over changjiang - huaihe river basin where the physics values are well according to the heavy rainstorm positions ; the low level jet is closely subject to the moisture and the coupled system of the low and the upper level jetstreams induced the strongly " ascending motion ; the intensity of the frontogenesis varies with the development of the rainfall system and reacts the rainfall intensity 主要分析了這次過(guò)程中的多種物理量,包括渦度、散度、垂直速度、鋒生函數(shù)、視熱源、視水汽匯等,對(duì)這一暴雨過(guò)程有了比較系統(tǒng)的認(rèn)識(shí)。結(jié)果表明:在江淮流域存在著有利于發(fā)生暴雨的物理量場(chǎng)配置,渦度、散度、垂直速度等物理量,與暴雨的落區(qū)都很吻合的;低空急流的產(chǎn)生不僅有利于水汽的輸送,而且高低空急流的耦合造成了有利于強(qiáng)上升運(yùn)動(dòng)的配置;鋒生強(qiáng)度隨著降水系統(tǒng)的發(fā)展變化,并影響降水強(qiáng)度。