近10 a中亚低涡背景下新疆短时强降水环境场分析

Abstract

Abstract: The Central Asian Low Vortex often caused many anomalies such as short-time heavy rainfall,low temperature and drought in Xinjiang,China.In order to fully understand the mechanism how a short-time heavy rainfall in Xinjiang is generated under the background of the Central Asian Low Vortex and therefore to provide referential data for the forecast and early warning of a short-time heavy rainfall,this paper analyzed the environmental field characteristics and circulation configurations of three different kinds of short-time heavy rainfall caused by Central Asian Low Vortex in Xinjiang occurred from May to September between 2005 and 2014.Based on the principle of synoptic meteorology and dynamic meteorology,this study conducted the analysis using the observational data,NCEP FNL data and radiosonde data.The result indicates as follows:(1) Most of the short-time heavy rainfalls are of the first type and took place in the southwest airflow in front of the low vortex of 500 hPa.The second type short-time heavy rainfalls come second and they took place in northwest airflow and the third type short-time heavy rainfalls as the least took place in west airflow. (2) The A index changes greatly without rules to follow.Therefore the A index makes no sense in precipitation forecast in Xinjiang. (3) The circulation configuration of the short-time heavy rainfall under the background of Central Asian Low Vortex belongs to the pattern of convective weather caused by upper cold advection. (4) The common ground of the three types of short-time heavy rainfall in the circulation configuration is that there is significant airflow in the upper troposphere,shear lines in the low altitude and east wind convergence line near the ground,and moist tongue at 700 hPa.The difference of the three types of short-time heavy rainfall existed in the circulation configuration.The first type rainfall has significant southwest airflow at 500 hPa and has big moist tongue.The second type rainfall has significant northwest airflow at 500 hPa with a big temperature difference between the high and low altitudes but humidity conditions in general.The third type rainfall has significant west airflow at 500 hPa with a strong vertical wind shear.

Key words: Central Asian Vortex, short-time heavy rainfall, environmental parameters, weather configuration

CLC Number:

P426.6

AYITKEN Maulen, YANG Lian-mei, ZHANG Yun-hui, MUSA Yusuf. Characteristic analysis of environment of short-time heavy rainfall under the background of the Central Asian Vortex in Xinjiang in recent ten years[J].干旱区地理, 2018, 41(2): 273-281.

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Characteristic analysis of environment of short-time heavy rainfall under the background of the Central Asian Vortex in Xinjiang in recent ten years

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