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首页> 外文期刊>Advances in Atmospheric Sciences >Mesoscale Analysis of a Heavy Rainfall Event over Hong Kong During a Pre-rainy Season in South China
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Mesoscale Analysis of a Heavy Rainfall Event over Hong Kong During a Pre-rainy Season in South China

机译：华南雨季前香港大雨事件的中尺度分析

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During the Heavy Rainfall Experiment in South China (HUAMEX) of 1998, a record heavy rainfall event occurred in the delta of the Pearl River during the 24 hours from 1200 UTC 8 June to 1200 UTC 9 June, 1998, and a 24-hour precipitation maximum of 574 mm was reported in Hong Kong. In this paper, some mesoscale characteristics of this heavy rainfall event are studied using data from satellites, Doppler radar, wind profilers, and automatic meteorological stations collected during HUAMEX. The following conclusions are drawn: (1) During this heavy rainfall event, there existed a favorable large-scale environment, that included a front with weak baroclinity in the heavy rain area and with an upward motion branch ahead of the front. (2) Unlike most extratropical or subtropical systems, the closed low in the geopotential height field does not exited. The obvious feature was that a southerly branch trough in the westerlies existed and Hong Kong was located ahead of the trough. (3) The rainfall areas were located in the warm sector ahead of the front, rather than in the frontal zone, which is one of the characteristics of heavy rainfalls during the pre-rainy season of South China. A southerly warm and moist current contributed to the heavy rainfall formation, including the transportation of rich water vapor and the creation of strong horizontal wind convergence. (4) The observations show that the heavy rainfall in Hong Kong was directly caused by a series of meso β systems rather than a mesoscale convective complex (MCC). These meso β systems moved with the steering current in the lower-mid troposphere, their life cycles were 3-6 hours, and their horizontal sizes were 10-100 km. (5) The disturbances in the lower and mid troposphere, especially that in the planetary boundary layer (PBL) were very shallow. However, they are a possible trigger mechanism for the occurrence and development of the mesoscale convective systems and related heavy rainfalls. Finally, a conceptual model of the heavy rainfall in the warm sector ahead of the front in South China is proposed.
机译：在1998年华南地区的大雨试验（HUAMEX）期间，珠江三角洲发生了创纪录的大雨事件，时间是从1998年6月8日1200 UTC到1998年6月9日1200 UTC，这是24小时的降雨据报道，香港最大为574毫米。在本文中，利用来自HUAMEX期间收集的卫星，多普勒雷达，风廓线仪和自动气象站的数据研究了这次强降雨事件的一些中尺度特征。得出以下结论：（1）在这次强降雨事件中，存在着一个有利的大尺度环境，该环境包括一个在强降雨地区斜压弱的锋面，并且在该锋面之前有一个向上运动分支。 （2）与大多数温带或亚热带系统不同，地势高度场中的闭合低点不存在。明显的特征是，在西风中存在一个向南的分支槽，而香港位于该槽的前面。 （3）降雨区位于锋面前的暖区，而不是额叶区，这是华南前汛期强降雨的特征之一。南半球温暖潮湿的水流促成了大雨的形成，包括大量水汽的输送和强水平风的汇聚。 （4）观察结果显示，香港的暴雨直接由一系列中尺度β系统引起，而不是中尺度对流复合体（MCC）。这些中观β系统随着转向电流在对流层中低层移动，其生命周期为3-6小时，其水平尺寸为10-100 km。 （5）对流层中低层，特别是行星边界层（PBL）的扰动非常浅。但是，它们可能是中尺度对流系统和相关强降雨发生和发展的触发机制。最后，提出了华南前缘暖区暴雨的概念模型。

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