| 浙江北部一次热带低压引发的大暴雨过程分析 |
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| 引用本文： | 刘汉华,;彭霞云,;张子涵,;杨万裕.浙江北部一次热带低压引发的大暴雨过程分析[J].湖北气象,2014(2):139-148. |
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| 作者姓名： | 刘汉华 ;彭霞云 ;张子涵 ;杨万裕 |
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| 作者单位： | [1] 浙江省气象台,杭州310017; [2] 浙江省台州市气象局,台州318000 |
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| 基金项目： | 浙江省气象局重点科技项目（2012ZD03）;浙江省气象局一般项目（2011Y08） |
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| 摘 要： | 利用常规气象观测资料、NCEP 1°×1°再分析资料、FY-2E卫星云图及相关定量产品,分析了2013年8月18—19日浙江北部一次大暴雨天气过程。结果表明:(1)热带低压是此次暴雨产生的直接影响系统,低压与副热带高压之间偏东风急流为暴雨产生提供了水汽和能量条件。(2)热带低压具有明显的不对称结构,其中心随高度西倾;强对流云团主要分布在500 hPa低压环流北侧,也是此过程强降水的直接制造者,其移动演变与强降水区移动演变一致。(3)卫星云图及相关产品分析表明,相当黑体亮温(TBB)、射出长波辐射(OLR)低值带对强降水区具有较好的指示意义,其值大小对降水强度有较好反映;在实际业务中,可结合实况和卫星云图及相关定量产品对预报及时作出订正。(4)此过程水汽主要来源于东海,边界层为水汽通量辐合区;强降水区与850 hPa假相当位温密集带垂直;地面中小尺度系统为暴雨产生提供了有利的抬升条件;杭州湾喇叭口地形对降水有明显增幅效应。
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| 关 键 词： | 暴雨 热带低压 相当黑体亮温 射出长波辐射 |
Analysis of an extremely heavy rain event caused by a tropical depression in the north of Zhejiang |
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| Institution: | LIU Hanhua, PENG Xiayun, ZHANG Zihan, YANG Wangyu (1. Zhejiang Meteorological Observatory, Hangzhou 310017;2. Taizhou Meteorological Office of Zhejiang Province, Taizhou 318000) |
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| Abstract: | By using the conventional data of meteorological observations, NCEP 6-hourly reanalysis data with resolution 1 °×1 °, and FY-2E satellite cloud and related quantitative products, we analyzed an extremely heavy rain event occurred from August 18 to 19 of 2013 in the north of Zhejiang. The results show that （1） the tropical depression is the system that direct impacted on the event. In addition, the easterly jet stream between the depression and subtropical high over the west Pacific provide moisture and energy for the formation of the event;（2） There is evidently an asymmetric structure with tropical depression, which the centers of depression lean westward with height. Strong convec-tive cloud clusters distributed mainly in the north side of low pressure circulation at 500 hPa lead directly to the event, and the movement of clusters are in accordance with the distribution of the strong precipitation;（3） Analysis of satellite cloud images and related products indicate that changes of blackbody temperature （TBB） and lower value center of outgoing longwave radiation （OLR） are of indicative significance to the distribution of the strong precipitation, whose magnitudes have a good response for the precipitation intensity;（4） Water vapor required by the event comes mainly from the East China Sea, and the water vapor flux convergence zone is situated in boundary layer. Strong precipitation ar-ea is perpendicular to the concentrated pseudo-equivalent potential temperature isoneph zone. Meso-and micro-scale systems at ground lev-el provide favorable lifting conditions for the occurrence of the event, and the trumpet-shaped topography in Hangzhou bay has clear effect on the increase of rainfall. |
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| Keywords: | heavy rain Tropical depression TBB OLR |
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