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暴雨灾害
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暴雨灾害  2019, Vol. 38 Issue (4): 320-328    DOI: 10.3969/j.issn.1004-9045.2019.04.004
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浙江省6—9月午后短时强降水空间分布特征分析
吕劲文1, 姚日升2, 涂小萍3, 申华羽1, 方艳莹1
1. 浙江省宁波市气象服务中心, 宁波 315012;
2. 浙江省宁波市生态环境气象中心, 宁波 315012;
3. 浙江省宁波市气象台, 宁波 315012
Analysis on spatial distribution characteristics of afternoon flash heavy rain from June to September in Zhejiang
Lü Jingwen1, YAO Risheng2, TU Xiaoping3, SHEN Huayu1, FANG Yanying1
1. Ningbo Meteorological Service Center of Zhejiang Province, Ningbo 315012;
2. Ningbo Ecological Meteorological Center of Zhejiang Province, Ningbo 315012;
3. Ningbo Meteorological Observatory of Zhejiang Province, Ningbo 315012
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摘要 利用浙江省2012-2016年6-9月自动气象观测站逐日逐小时资料,分析了浙江省午后短时强降水时空分布特征,基于NCEP全球再分析资料探讨了此类天气发生的环流背景,统计分析其中6个具有地域代表性的高概率发生站点的物理量统计特征。结果表明:浙江北部的杭州和宁波城区、浙江中部和南部的高海拔山区都是午后短时强降水发生概率相对高的区域,浙江东部沿海、金衢盆地以及千岛湖概率较低。6-9月浙江省各月午后短时强降水触发条件有所不同,7、8月短时强降水相对多发,均具有明显的热对流性质,同时边界层的弱辐合、城市热岛效应和山区地形作用对短时强降水落区均有影响。午后短时强降水发生前,平原地区所需要的层结不稳定度以及水汽条件较山区为高,并且低层还需要一定的垂直风切变维持。统计表明:午后短时强降水发生前6 h的CAPE值多数个例有较大的增量,而抬升指数等表征大气不稳定程度和水汽的指标虽无明显变化,但均向利于短时强降水发生的方向发展。
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吕劲文
姚日升
涂小萍
申华羽
方艳莹
关键词短时强降水   环流背景   物理参数   空间分布   浙江省     
Abstract: By using several kinds of data, including the hourly data from the automatic weather stations in Zhejiang Province and the National Centers for Environmental Prediction (NCEP/NCAR) global reanalysis data with resolution of 1°×1° from June to September during 2012 to 2016, the temporal and spatial distributions of afternoon flash heavy rainfalls in relation to weather patterns and physical parameter characteristics were studied. Results show:(1) Probability of afternoon flash heavy rainfalls was relatively high in the downtown areas in cities such as Hangzhou and Ningbo in northern Zhejiang, as well as the hilly areas in middle and southern parts of Zhejiang, while the probability of flash heavy rainfall was relatively low in coastal areas, Jinhua-Quzhou basin and the Qiandao lake. (2) Meteorological factors in triggering afternoon flash heavy rainfalls varied greatly by temperatures, subtropical high, boundary line etc. from June to September. Severe convective rainstorms are more likely to happen in July and August than in June and September. Focus should be paid on factors, such as unstable energy at the edge of subtropical high, the function of boundary convergence, the urban-heat island effects and the forced uplift mechanisms over mountain terrain during July and August. (3) Requirement for instability and water vapor were higher for triggering afternoon flash heavy rainfall in the plain areas than in hilly areas, and vertical wind shears between 1 000 and 700 hPa was important in rainstorm maintaining over the plain areas. (4) CAPE tended to surge six hours before most afternoon flash heavy rainfall occurred. Although factors of instability and vapors displayed little change, most meteorological physical parameters developed to be more favorable for afternoon flash heavy rainfalls.
Key wordsafternoon flash heavy rain   background of atmospheric circulation   physical parameter   spatial distribution   Zhejiang Province   
收稿日期: 2019-02-11;
基金资助:中国气象局预报预测核心业务发展专项(CMAHX20160106);浙江省气象科技计划重点项目(2017ZD06)
通讯作者: 姚日升,主要从事天气气候相关技术与方法研究。E-mail:yaorisheng@aliyun.com   
作者简介: 吕劲文,主要从事天气预报和服务。E-mail:jwlv1985@126.com
引用本文:   
吕劲文, 姚日升, 涂小萍,等 .2019. 浙江省6—9月午后短时强降水空间分布特征分析[J]. 暴雨灾害, 38(4): 320-328.
Lü Jingwen, YAO Risheng, TU Xiaoping, et al .2019. Analysis on spatial distribution characteristics of afternoon flash heavy rain from June to September in Zhejiang[J]. Torrential Rain and Disasters, 38(4): 320-328.
 
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