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孟加拉湾风暴影响低纬高原的环流和云图特征分析
许美玲, 张秀年, 杨素雨
云南省气象台, 云南, 昆明, 650034
摘要:
通过对12个造成云南19次全省性暴雨的孟加拉湾风暴(以下简称孟湾风暴)进行合成分析,得到了孟湾风暴影响低纬高原地区的降水及环流特征,要造成低纬高原地区的暴雨天气过程的风暴中心通常位于孟加拉湾中部及其以东以北地区、副高脊线位于15~20°N之间、西脊点从中国南海到中南半岛、低纬高原处于槽前和副高外围的西南气流控制。孟湾风暴前西南低空急流对强降水的形成具有重要的作用,它一方面起着输送水汽和能量的作用,另一方面又有助于维持必要的动力学条件。卫星云图特征分析表明:风暴在孟加拉湾海域形成后,其云系中不断有中尺度对流云团生成移入低纬高原造成暴雨天气。
关键词:  孟湾风暴  低纬高原  大尺度环流  卫星云图
DOI:
分类号:
基金项目:云南省科技攻关及高新技术计划项目(2006GS25)资助
AMBIENT FIELDS AND SATALLITE PICTURES CHARACTERISTIC ANALYSIS BY THE BENGAL BAY STORM IN LOW-LATITUDE PLATEAU
XU Mei-ling, ZHANG Xiu-nian, YANG Su-yu
Meteorological Observatory of Yunan Province, Kunming 650034, China
Abstract:
Based on the synthetical analysis method,12 times the Bengal Bay storms aroused by 19 times rainstorm cross the whole province in Yunnan have been studied,and some interesting results of rain and circulation characteristic influenced by the Bengal Bay storm have been gotten in low-latitude plateau.Usually,when a rainstorm weather process occur in low-latitude plateau,the storm center locates on the middle,the east and the north of the Bay of Bengal,at the same time,the subtropical high ridge line moves to 15~20°N and west ridge point moves to the South China Peninsula from the South China Sea and the low-latitude plateau is controlled by southwest airstream coming from the front of trough and the periphery of subtropical high.The southwest low-level jet stream from the east side of the Bengal Bay storm have great effect on a heavy rain.One side,the southwest low-level jet stream is playing the transportation water vapor and the energy role.Another side,the southwest low-level jet stream is helpful to keep essential dynamical condition.By analyzing the satellite cloud chart,it is found that mesoscale convection cloud cluster will grow and move into low-latitude plateau coming from the Bengal Bay storm cloud series when a storm grows in the Bay of Bengal.
Key words:  Bay Bengal storm  low-latitude  large scale circulation  satellite cloud chart
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