%0 Journal Article %A ZHUANG Xiaocui %A LI Boyuan %A ZHAO Jiangwei %A LI Jiangang %A ZHANG Linmei %T Water vapor source and transport characteristics of rainstorm processes in warm season on southern slope of the Tianshan Mountains %D 2022 %R 10.11755/j.issn.1006-7639(2022)-01-0030 %J Journal of Arid Meteorology %P 30-40 %V 40 %N 1 %X

The abundant water vapor supply is a necessary condition for heavy rainfall, especially in arid area with complex terrain on southern slope of the Tianshan Mountains. Based on daily precipitation at sixteen weather stations of southern slope of the Tianshan Mountains and NCEP/NCAR GDAS reanalysis data from May to September during 1981-2020, the circulation situation of rainstorms in warm season on southern slope of the Tianshan Mountains was analyzed, and the water vapor source and transport trajectory was simulated and clustered by using HYSPLIT model and cluster analysis. The results show that the rainstorms in warm season on southern slope of the Tianshan Mountains mainly occurred over the overlap area of the South Asia high pressure with double pattern, southwesterly jet (airflow) above 500 hPa, 700 hPa shear convergence and topographic force lifting of the Tianshan Mountains. Water vapor mainly came from Central Asia, the Atlantic Ocean and its coasts, the Mediterranean Sea and the Black Sea and adjacent areas, through the key areas of TKAP (Tajikistan, Kyrgyzstan, northeastern Afghanistan, northern Pakistan and northwestern India), southern and northern Xinjiang, it mainly transported into rainstorm areas by the westerly, southerly, northerly channels, respectively. The water vapor above 700 hPa and below 700 hPa over rainstorm areas mainly came from the westerly and northerly channels, respectively, and the contribution of water vapor in the key area of southern Xinjiang to rainstorms was the maximum. The water vapor from central Asia mainly transported to 700 hPa and below, the contribution to rainstorms was greater, and the damage of water vapor was more along the transport way, while the water vapor from the Atlantic Ocean and its coastal areas, the Mediterranean Sea and the Black Sea mainly transported above 700 hPa, and the contribution to rainstorms was relatively smaller. In additional, the water vapor in middle and lower troposphere came from northern and southern Xinjiang, eastern North America and Mongolia. Based on the above characteristics, a three-dimensional fine structure model of water vapor for rainstorm processes in warm season on southern slope of the Tianshan Mountains was established.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2022)-01-0030