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气象:2021,47(9):1122-1134
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中国南方地区冻雨落区分析及推算
康丽莉,姜瑜君,邓芳萍,周象贤
(浙江省气象科学研究所,杭州 310008; 国网浙江省电力公司电力科学研究院,杭州 310014)
Analyses and Calculation of Freezing Rain Falling Zone in Southern China
KANG Lili,JIANG Yujun,DENG Fangping,ZHOU Xiangxian
(Zhejiang Institute of Meteorological Sciences, Hangzhou 310008; State Gird Zhejiang Electric Power Research Institute, Hangzhou 310014)
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投稿时间:2020-06-01    修订日期:2021-07-14
中文摘要: 基于改进的层结分析法,对2008—2019年我国出现的5次严重冻雨过程的冻雨落区及冻雨出现的海拔高度进行了推算,并利用全国地面2000多个地面测站的雨凇观测数据及电网覆冰灾情资料进行了验证。改进算法后推算的冻雨落区不仅涵盖了地面观测的雨凇分布区域,还涵盖了无雨凇观测但出现严重冻雨灾情的山区,且推算的冻雨出现海拔高度与实际灾情出现高度也较为一致,从而较好地解释了复杂地形条件下出现明显冻雨灾情而未见地面雨凇观测记录的现象。推算获取的5次冻雨落区叠加后表明:中国南方地区存在一条从贵州、湖南、江西到浙江,自西向东、冻雨频次由高到低的冻雨带。该冻雨带往北可发展到达四川、重庆、湖北、安徽南部,往南则可抵达云南、广西、广东和福建北部,其南部分布边缘与我国南方山脉走向较为一致。冻雨区域上空普遍存在“冷 暖 冷”的层结特征,而在浙江省,广西、广东和福建三省(自治区)的北部等地形起伏度较大的地区,则具有“暖 冷 暖 冷”的层结特点,即近地面存在气温高于0℃的浅薄暖层。因而,浙江省和福建北部的冻雨主要出现在海拔高度为300~400 m以上的山区,广西东北部和广东西北部还受深厚暖层影响,冻雨多出现在海拔高度为300~1 〖KG-*5〗300 m的山腰区域。
Abstract:Based on the improved stratification analysis method, the freezing rain fall zones and the altitudes of five severe freezing rain processes that occurred in China during 2008-2019 are calculated, and the result is verified by using the glaze data observed at 2 〖KG-*5〗000 stations and the ice disaster data of power grid. The calculated freezing rain fall zones cover both the areas with glaze and the areas with severe freezing rain disaster. The calculated altitudes of freezing rain occurrence are also consistent with the altitudes of ice disasters. The calculated results can well explain the phenomenon that there is freezing rain disaster but no glaze records under complex terrain conditions. The five calculated freezing rain fall zones are superimposed, showing that there is a freezing rain belt from Guizhou, Hunan, Jiangxi to Zhejiang, with the day number of freezing rain from high to low. The freezing rain belt can develop northward to Sichuan, Chongqing, Hubei and southern Anhui, and southward to Yunnan, Guangxi, Guangdong and northern Fujian. There is a typical cold-warm-cold stratification above the freezing rain zone. However, there is a warm-cold-warm-cold stratification above the freezing rain zone in greatly undulate terrain, such as Zhejiang and the north of Guangxi, Guangdong and Fujian, that is, there is a shallow warm layer with temperature higher than 0℃ near the surface. Therefore, the freezing rain usually occurs in the mountainous areas with an altitude above 300-400 m in Zhejiang and northern Fujian. The northeast of Guangxi and the northwest of Guangdong are also affected by the deep warm layer, and the freezing rain mostly occurs in the hillside areas with an altitude of 300-1 〖KG-*5〗300 m.
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基金项目:国家重点研发计划(2018YFC1507802)和国网浙江省电力有限公司科技项目(5211DS18002P)共同资助
引用文本:
康丽莉,姜瑜君,邓芳萍,周象贤,2021.中国南方地区冻雨落区分析及推算[J].气象,47(9):1122-1134.
KANG Lili,JIANG Yujun,DENG Fangping,ZHOU Xiangxian,2021.Analyses and Calculation of Freezing Rain Falling Zone in Southern China[J].Meteor Mon,47(9):1122-1134.