陜西強(qiáng)連陰雨天氣個(gè)例的綜合分析

doi:10.3969/2012jms.00**

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陜西強(qiáng)連陰雨天氣個(gè)例的綜合分析
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P456.7
基金項(xiàng)目:國(guó)家973項(xiàng)目(編號(hào):2004CB720208)，國(guó)家自然科學(xué)基金項(xiàng)目(編號(hào):40121303)，科技部基礎(chǔ)研究專項(xiàng)(編號(hào):2001CCB00100)，中國(guó)氣象局新技術(shù)推廣項(xiàng)目(編號(hào):CMATG2005Y09)共同資助

SYNTHETIC ANALYSES ON STRONG CONSECUTIVE RAINFALL IN AUTUMN OVER SHAANXI PROVINCE

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利用T213客觀分析資料,對(duì)陜西2003年8月24日~9月7日強(qiáng)連陰雨天氣過程的綜合分析表明,連陰雨發(fā)生在歐亞穩(wěn)定的環(huán)流形勢(shì)下,烏拉爾山阻塞高壓的建立和穩(wěn)定使東亞中緯度緯向環(huán)流得以長(zhǎng)時(shí)間維持。偏北、偏西、偏強(qiáng)的西太平洋副熱帶高壓,不僅使冷空氣受阻于秦嶺山脈附近,同時(shí)其外圍的偏南氣流也為雨區(qū)提供了豐富的水汽,而烏拉爾山阻塞高壓的崩潰引導(dǎo)冷空氣大舉南下,西太平洋副熱帶高壓的東移南退則預(yù)示著持續(xù)的降水天氣的結(jié)束。東亞合成環(huán)流的垂直結(jié)構(gòu)表明,連陰雨期間秦嶺鄰近地區(qū)始終處于鋒區(qū)中,并存在低空輻合、高空輻散的垂直結(jié)構(gòu)。水汽條件分析表明連陰雨期間水汽的輸送主要在對(duì)流層底部。熱力學(xué)條件分析顯示連陰雨期間河套始終為高潛熱能區(qū)和位勢(shì)不穩(wěn)定區(qū),偏南氣流對(duì)熱量的輸送與高潛熱能的維持有密切的關(guān)系,而低層偏東氣流的加強(qiáng)促使了潛熱能的釋放,并導(dǎo)致了秦巴山區(qū)強(qiáng)降水天氣的產(chǎn)生。

Abstract:

Based on the objectively analyzed data of T213 model,the strong consecutive rainfall in Shaanxi province,which happened from August 24 to September 7,2003,has been analyzed.The results show that,this consecutive rainfall occurred in the stable zonal circulation of eastern Asian,with great longitudinal circles and blocked high at its upside,which made the latitudinal circle sustain in the mid-latitude areas of eastern Asian and west Pacific Ocean.The study on vertical structure of synthetic circle in eastern Asian displays that,during the consecutive rainfall,the area of Qinling Mountains was under the control of front,with vertical structure of convergence in the low air but divergence in high air.The vertical section displays rainfall progress happened with the flimsy cold air cushion in the low air,but warm air flow climbing by the cold air cushion.Additionally ,the analyses on vapor condition explore that during the rainy time,the moisture was transported mainly in the bottom of troposphere and the water almost derived from the East Sea and the South Sea by the easterly or southerly great and stable airflow around the subtropical high.In the end,study of thermodynamics uncovers that Northwest China always was in the area of high potential,and the southerly airflow was closely related with the transmission of energy and the maintenance of high potential,at the same,time the strengthening of easterly air flow in the low air impelled the release of potential and resulted in the strong rainfall in Qinling Mountains.

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方建剛,張弘,白愛娟,陶建玲.陜西強(qiáng)連陰雨天氣個(gè)例的綜合分析.氣象科學(xué),2006,(5):578-585 Fang Jiangang, Zhang Hong, Bai Aijuan, Tao Jianling. SYNTHETIC ANALYSES ON STRONG CONSECUTIVE RAINFALL IN AUTUMN OVER SHAANXI PROVINCE. Journal of the Meteorological Sciences,2006,(5):578-585

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