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气象:2020,46(12):1543-1554
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上海地区暖季午后对流的雷达气候学特征分析
管理,戴建华,赵渊明,田洪军,秦南南
(上海中心气象台,上海 200030; 中国气象局上海台风研究所,上海 200030; 复旦大学大气科学研究院,上海 200438)
Radar Climatology Analysis of Warm Season Afternoon Convective Storm over Shanghai
GUAN Li,DAI Jianhua,ZHAO Yuanming,TIAN Hongjun,QIN Nannan
(Shanghai Central Meteorological Observatory, Shanghai 200030; Shanghai Typhoon Institute, CMA, Shanghai 200030; Institute of Atmospheric Sciences, Fudan University, Shanghai 200438)
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投稿时间:2019-09-15    修订日期:2020-10-30
中文摘要: 利用探空资料和雷达客观分析产品,对2014—2018年上海地区暖季(6—9月)弱天气尺度系统强迫下局地对流的环境因子参数、风暴空间分布和回波三维结构进行气候学统计分析。利用风暴追踪(STI)产品提供的风暴位置、风暴历史路径等信息,分别统计了暖季上海不同区域午后对流发生频次和风暴移动路径轨迹频次的空间分布,进而分析弱天气尺度系统强迫下上海午后对流的触发原因。结合风暴位置和历史路径将局地风暴划分为外部移入型、局地生成移动型和局地生成少动型三类,利用对应的风暴结构(SS)产品统计比较了三类风暴的生命史长短和回波三维结构特征。研究结果表明:影响上海的午后对流主要发生在中心城区至长江口区域,其主要成因为城市热岛和北支海风锋;同时三类风暴在生命周期、质心高度、垂直液态含水量和最大反射率因子及高度方面存在较明显差异。
Abstract:During the warm season (June-September) from 2014 to 2018, the sounding parameters and indices of convention as well as the spatial characteristics and distributions of the afternoon convective storms in Shanghai under weak synoptic-scale forcing were documented using atmospheric sounding data, storm tracking identification (STI) and storm structure (SS) products. The STI product provides storms’ current position and the historical position. Intending to reveal the trigger mechanism in Shanghai under weak synoptic-scale forcing, storm frequency statistics in different regions were made utilizing the storm position firstly, then the spatial distribution of storm track was analyzed based on storm historical position. The convective storms in afternoon were classified into three types including storm from other places, localized moving storm and localized anchoring storm according to storm position and historical routes. The corresponding storm structure was introduced to reveal the differences of storm life cycle as well as the storm structure characters. The results show that the afternoon convective storms that affect Shanghai in warm season mainly occur in the region from urban to the Yangtze River Estuary, which is mainly due to the urban heat island effect and the northern sea breeze. There are significant differences among the three types storms in life cycle, centroid height, vertical integral liquid, maximum reflectivity and height of maximum reflectivity.
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基金项目:国家重点研发计划(2018YFC1507601)、国家自然科学基金项目(41775049)、上海市科委研究计划项目(18DZ1200403)、上海台风基金(TFJJ201917)、工信部项目(MJ-2018-S-28)、上海市气象局科技研发项目(YJ201805)和“上海市气象局强对流创新团队”共同资助
引用文本:
管理,戴建华,赵渊明,田洪军,秦南南,2020.上海地区暖季午后对流的雷达气候学特征分析[J].气象,46(12):1543-1554.
GUAN Li,DAI Jianhua,ZHAO Yuanming,TIAN Hongjun,QIN Nannan,2020.Radar Climatology Analysis of Warm Season Afternoon Convective Storm over Shanghai[J].Meteor Mon,46(12):1543-1554.