2008年初持續(xù)雨雪災(zāi)害過(guò)程分析

doi:10.3969/2012jms.00**

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2008年初持續(xù)雨雪災(zāi)害過(guò)程分析
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P458.3
基金項(xiàng)目:中國(guó)氣象局公益性行業(yè)專項(xiàng)（GYHY（QX）2007-6-12）和湖南省高分辨數(shù)值預(yù)報(bào)釋用技術(shù)研究課題

The analysis of persistent rain and snow,disasters process at the beginning of 2008

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利用地面實(shí)況資料與長(zhǎng)沙單站探空等觀測(cè)資料，對(duì)2008年1月中下旬至2月上旬初發(fā)生在湖南的低溫、雨雪、凍雨災(zāi)害天氣過(guò)程的影響實(shí)況和成因進(jìn)行了分析。結(jié)果表明：中高緯阻高的建立、崩潰、重建導(dǎo)致其前部的鄂霍茨克海低渦不斷引導(dǎo)冷空氣南下，是產(chǎn)生低溫、雨雪、凍雨的大氣環(huán)流背景；南支鋒區(qū)上強(qiáng)盛的西南氣流帶來(lái)了充沛的水汽，與北支鋒區(qū)上南下的冷空氣結(jié)合時(shí)，出現(xiàn)了持續(xù)的凍雨，當(dāng)凍雨形成后逆溫的強(qiáng)弱、融化層厚度及暖層溫度高低、冷卻層厚度、700 hPa西南氣流強(qiáng)弱、日平均氣溫與日雨量的變化都與凍雨厚度變化密切相關(guān)；當(dāng)高空南支有低槽分裂東移，中低層西南大風(fēng)核上強(qiáng)烈的水汽輻合與阻高崩潰橫槽轉(zhuǎn)豎帶來(lái)的冷空氣共同作用影響時(shí)，為南方大范圍暴雪過(guò)程提供了動(dòng)力、水汽和凝結(jié)條件。

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By using the conventional intensive observational data and sounding data of Changsha, the impact and the cause of formation of low temperature, rain, snow, sleet disasters process in Hunan from mid-January to mid-February 2008 were analyzed.Results show that the establishment, collapse and reconstruction of the blocking high in the high-latitude caused the cold air which was guided by the front of the vortex of the Ochotsk Sea to move southward continuously.Its the atmospheric circulation background which caused the cold temperature, rain, snow and freezing process. The persistent freezing occurs when the plentiful water vapor which was brought from the strong southwest stream on the Southern Branch front zone was combined with the southward cold air which came from the Northern Branch front zone. When freezing formed, the changes of the stream thickness had closely related to the temperature inversion intensity, the thickness of melted layer, the temperature of warming layer, the thickness of cooling layer, the intensity of 700 hPa southwest airflow, the daily average temperature and daily rainfall. When the low groove of South Branch split eastward, the strong moisture convergence in the lower southwest gale core was combined with the cold air which was brought by blocking high collapse and horizontal groove translated into vertical rotation to provide the dynamic, water vapor and condensatin conditions for the large range blizzard in the south.

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姚蓉,黎祖賢,戴澤軍,許霖,傅承浩.2008年初持續(xù)雨雪災(zāi)害過(guò)程分析.氣象科學(xué),2009,(6):838-843 Yao Rong, Li Zuxian, Dai Zejun, Xu Lin, Fu Chenghao. The analysis of persistent rain and snow, disasters process at the beginning of 2008. Journal of the Meteorological Sciences,2009,(6):838-843

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