库姆塔格沙漠大降水环流分型及不同环流型典型天气过程分析  

Circulation classification of heavy rain in the Kumtagh Desert in the typical weather process of different circulation patterns

作　　者：胡钰玲 赵中军[2] 康彩燕 王式功[1,3] 尚可政[1] Hu Yu-ling Zhao Zhong-jun Kang Cai-yan Wang Shi-gong Shang Ke-zheng(Key Laboratory of Arid Climate Change and Disaster Reduction in Gansu Province, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China Atmospheric Center Station, Unit 92493 of People＇s Liberation Army of China, Huludao 125000, Liaoning, China College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China)

机构地区：[1]兰州大学大气科学学院甘肃省干旱气候变化与减灾重点实验室 [2]中国人民解放军92493部队中心气象台 [3]成都信息工程大学大气科学学院

出　　处：《兰州大学学报（自然科学版）》2017年第5期614-621,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家公益性行业(气象)科研专项(GYHY201306047;GYHY201206004);科技基础性工作专项(2012FY111700);中央高校基本科研业务费专项基金项目(lzujbky-2013-m03)

摘　　要：利用1960-2014年最靠近库姆塔格沙漠的4个气象观测站的逐日降水资料、2.5°×2.5°的NCEP/NCAR再分析资料和1°×1°的FNL再分析资料,在库姆塔格沙漠大降水500 hPa环流分型的基础上,运用物理量场诊断分析方法对不同环流型的典型大降水过程进行诊断分析,并运用HYSPLIT后向轨迹模型追踪其水汽来源.结果表明:大降水的500hPa环流型可分为低涡切变型、新疆低槽型和贝加尔湖至新疆横槽型;大降水的水汽路径主要分3支:西风气流携带的来自大西洋、里咸海和极地北冰洋的海源水汽,沙漠南侧西南气流携带的来自印度洋-孟加拉湾的暖湿水汽,华中一带东南气流携带的来自孟加拉湾-南海和西太平洋的暖湿水汽;库姆塔格沙漠上空区域平均水汽通量随高度增加而递减,各层中以700 hPa水汽通量最大.大降水期间垂直上升运动强,为大降水的发展和维持提供动力条件.Based on four meteorological stations＇ daily precipitation data of 1960-2014 and NCEP/NCAR reanalysis data, 500 hPa circulation patterns of heavy rain in the Kumtagh Desert were analyzed. The HYSPLIT model was used to track water vapor transport paths in this area. The results showed that 500 hPa main circulation patterns of heavy rain were the low vortex shear and low though in Xinjiang and the transverse trough from Lake Baikal to Xinjiang. For heavy rain,there were three water vapor branches in the Kumtagh Desert： the western moist flow from the Atlantic Ocean, the Arctic Ocean and the Aral and Caspian seas; the southwest warm moist flow from the Indian Ocean-the Bay of Bengal; the southeast warm moist flow from the bay of Bengal-the South China sea and western Pacific. Regional mean water vapor flux increased with height in the Kumtagh Desert. For different levels, the water vapor flux at 700 hPa was the largest. The vertical ascending motion was strong during the heavy precipitation,which provided dynamic conditions for the development and maintenance of heavy rain.

关 键 词：大降水 环流分型 水汽轨迹 库姆塔格沙漠 

分 类 号：TU18[建筑科学—建筑理论]