2014年夏初南疆一次持续性强降雨过程的水汽和动力条件分析

Abstract

Abstract: Increase of frequency and intensity of extreme precipitation events have significant effects on annual precipitation variation. During the period of June 17 to June 24 in 2014,continuous heavy rainfall occurred over the Tarim Basin. Using the daily 6h reanalysis dataset from National Centers for Environment Prediction/National Center for Atmospheric Research(NCEP/NCAR),this paper investigated the dynamic and water vapor conditions during the heavy rainfall process. The results show that the rainfall area is well matched the regions of vertical ascending motion and water vapor convergence. The eastern jet in low and middle troposphere strengthens the development of circulation,and increased the ascending motion. The jet intensity and its westward points determined the intensity and regions of the heavy rainfall in the Tarim Basin,respectively. Usually at the left side of jet axis in low and middle troposphere,it corresponds to the rainfall area of heavy rainfall. The Central Asia,Arabian Sea and Bay of Bengal are the main sources of water vapor. The water vapor over the Arabian Sea and Bay of Bengal can be transported to the Tarim Basin by monsoon circulation in two steps:first,the water vapor was transported to the Tibetan Plateau by summer monsoon,and then to the Tarim Basin by the advection in high troposphere and the recirculation in low and middle troposphere.

Key words: continuity heavy rainfall in Southern Xinjiang, water vapor transmission path, means of delivery, vertical movement

CLC Number:

P458.1

WANG Jiang, ZHOU Ya-man, WANG Yun, LI Ru-qi. Water vapour and dynamic conditions of a continuity heavy rainfall over southern Xinjiang in early summer 2014[J]., 2015, 38(6): 1103-1111.

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Water vapour and dynamic conditions of a continuity heavy rainfall over southern Xinjiang in early summer 2014

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