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中文摘要：
用 U.S.National，环境预言 / 公民的中心在 1 湯挠獡 ? 桔 ? 敲?瑬 ? 桳睯摥琠慨 ? 桴牥 ? 獩愠挠楲楴慣? 楤瑳湡散搠 ? 潦 ? 体噄? 为大气的研究分析数据集中湩戠牡 ' 覙 H 楮 ? 瑡潭灳敨敲圮敨 ? 桴 ? 楤瑳湡散戠瑥敷湥猠灥牡瑡摥瘠牯楴散 ? 獩猠慭汬牥琠慨 ? 牯攠畱污琠? 绥鳟彌 B? 潶瑲捩獥猠汥? 牯慧楮敺椠Ь
英文摘要：
Using the U.S. National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis data at 1°× 1° o resolution, analysis is performed on a persistent heavy rainfall event with two rain bands to the south of the Yangtze River during 17-22 June 2005. The northern rain band was related to the atmospheric mass adjustment of cold front precipitation and the associated ageostrophic feature to the rear right of subtropical westerly jets, while the southern counterpart formed under the joint influence of easterly/westerly jets and the South Asian high （SAH）. The ageostrophic wind field to the rear right of the easterly jet center gives rise to an anti-circulation that favors the genesis of the southern belt. The feature ofdu/dt 〈0 around the SAH ridge line and to the rear right of the easterly jet streak results in a strong v - vg〈O field in the vicinity of the rain region as well as to its south. When westerly jets move southward, an intense v Vg〉0 feature appears to the north of the rain region, i.e., behind the center of the westerly jets. The associated mass adjustment leads to vigorous divergence over the rain region, which is responsible for the strong precipitation from the warm sector of the front. Also, a θe front at the middle level of the southern rain band and the cold front favor the release of instable energy to enhance the rainstorm. The southern and northern fronts approach each other and the two rain belts merge into one.
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