阿克苏地区初秋一次暴雨过程诊断分析  

Causation Analysis of Early Autumn Rare Rainstorm in Akesu,Xinjiang

作　　者：曲良璐 张莉 谭甜甜 康娟 阿依加马力[3] QU Lianglu;ZHANG Li;TAN Tiantian;KANG Juan;Ayijiamali(Center for Central Asian Atmosphere Science Research,Urumqi 830002,China;Akesu Meterological Observatory,Akesu 843000,China;Awati Meterological Observatory,Awati 843200,China)

机构地区：[1]中亚大气科学研究中心,新疆乌鲁木齐830002 [2]阿克苏气象台,新疆阿克苏843000 [3]阿瓦提县气象局,新疆阿瓦提843200

出　　处：《沙漠与绿洲气象》2017年第2期60-65,共6页Desert and Oasis Meteorology

基　　金：中亚大气科学研究基金(CASS201707)资助

摘　　要：利用常规地面与高空观测资料、自动站逐时资料、NECP1°×1°再分析资料,对阿克苏地区2015年9月7日局地暴雨进行分析。结果表明,此次暴雨的主要成因有:(1)100hPa南亚高压双体型、200 hPa高空急流以及500 h Pa中亚槽提供了有利的环流背景,"三支气流"配合加强了动力以及热力条件并促使水汽快速汇集,强度为8 g·cm^(-1)·hPa^(-1)·s^(-1);(2)暴雨过程的大部分水汽是通过低层偏东气流接力输送,水汽的来源主要为南海及孟加拉湾;(3)暴雨发生前阿克苏处于高能高湿不稳定区域,存在315.9 J·kg^(-1)的不稳定能量,水汽上干下湿体现了一定的对流特征,同时锋区、垂直风切变、湿层以及不稳定能量的突变预示了强对流天气的发生;(4)低层风场辐合触发对流,地面辐合线及偏东风输送位置影响暴雨落区,加之较好的地面热力条件以及独特的地形增益暴雨强度。This paper analyzed the rainstorm in Aksu on the September7,2015using the conventional ground and upper-air observations,automatic station data,and NECP1.x1.reanalysis data.The results were shown as follows:(1)South Asia high-pressure at100hPa showed twin body,high altitude jet at200hPa and Central Asia trough at500hPa provide the favorable circulation background.The coupling of“three-branch airflow”strengthens the power and thermodynamic conditions and promotes the rapid collection of water vapor,and the maximum strength was8g·cm-1·hPa-1·s-1.(2)Most of the water vapor in the rainstorm process was transported through the lowerlevel easterly airflow,and the source of moisture was mainly the South China Sea and the Bay of Bengal.(3)In the area of high energy and humidity instability before torrential rains,There was a315.9J·kg-1unstable energy.The moisture on the water vapor embodies certain convection characteristics,while the abrupt changes of frontal area,vertical wind shear,wet layer and unstable energy indicate the occurrence of strong convective weather.(4)The convergence triggered convection of low-level wind farms,the ground convergence line and the partial Dongfeng conveying position affect the rainstorm area,coupled with better ground thermodynamic conditions and unique terrain gain storm intensity.

关 键 词：中尺度分析 水汽特征 动力热力条件 

分 类 号：P458.121.1[天文地球—大气科学及气象学]