| 李如琦,孙鸣婧,李桉孛,李建刚,唐冶.南疆西部暴雨的动力热力特征分析[J].沙漠与绿洲气象,2017,11(2):1~7 |
| 南疆西部暴雨的动力热力特征分析 |
| Analysis of Dynamic and Thermal Characteristics on Rainstormin West of Southern Xinjiang |
| 投稿时间：2016-11-30 修订日期：2017-02-16 |
| DOI：10.12057/j.issn.1002-0799.2017.02.001 |
| 中文关键词: 动力、热力机制 诊断分析 暴雨 南疆西部 |
| 英文关键词:dynamic and thermal mechanism diagnostic analysis rainstorm west of south-Xinjiang |
| 基金项目:中国沙漠气象科学研究基金(sqj2015001)、中亚大气科学研究基金、和中国气象局预报员专项共同资助. |
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| 中文摘要: |
| 采用NCEP1°×1°再分析资料,通过对2012年南疆西部3次暴雨过程中的锋生函数和湿位涡特征的对比,分析南疆西部降水的动力、热力条件与降水的关系,结果表明：锋生函数和湿位涡与南疆西部的降水有很好的对应关系,并能较好地反映降水的动力、热力机制。西部翻山的和东部“东灌”冷空气与南疆盆地的暖空气冷暖交汇,形成锋生。低层锋生辐合叠加地形强迫提供动力作用,触发降水。锋生的强度与降水强度成正比。低层辐合,暖气团被抬升,中层冷暖交汇的热力作用和水汽凝结,使降水维持,形成暴雨。垂直分布上前倾结构形成对流性降水，后倾结构形成持续性降水。 |
| 英文摘要: |
| Using the NCEP 1°×1° reanalysis data, by contrasting the frontogenesis function and MPV of 3 rainstorm in west of southern Xinjiang in 2012, the dynamic and thermal condition of rainfall are analyzed. The results show that there is an obvious correspondence between the frontogenesis function and MPV and rainfall in west of southern Xinjiang, and it can reflect the dynamic and thermal mechanism of rainstorm. Frontogenesis caused by intersection of the cold air crossing the mountain in west and westward-moving on low level and the worm air in south Xinjiang basin. Frontogenesis in low level and topographic forcing provide dynamic effect and trigger the rainfall. The strength of frontogenesis is in proportion to precipitation intensity. Low-level convergence, and warm air mass uplift, the cold and warm currents meet in middle-level provide thermal action and water vapor condensation, then the rainfall maintain and cause rainstorm.On the vertical distribution，the forward-tilting structure produce convective precipitation, and backward-tilting structure generate continuous rainfall. |
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