基于比湿订正拉格朗日模型的新疆短时强降水的水汽来源

doi:10.13866/j.azr.2019.03.22

Abstract

Abstract: The Lagrangian Backward Trajectory Model was used to research the moisture sources of short-time heavy rainfall in Xinjiang based on the change of specific humidity and the hourly observed data from China Ground Weather Station,GDAS meteorological data and NCEP/NCAR data during the period of 2016-2017.The results showed that:① Water vapor sources of Xinjiang were mainly the Caspian Sea,Black Sea,Mediterranean Sea,Atlantic Ocean,Arctic Ocean and nearby inland areas.Xinjiang was affected by the westerly wind all the year round,especially the westerly wind in the south; ② The water vapor transport paths in the Altay-Tacheng Forest Grassland Natural Area and the Desert Natural Area in the Junggar Basin were holistically northerly,and the Ili-Bayanbulak (the central Tianshan Mountains) Natural Area and Hami-Turpan Desert Natural Area were strongly affected by the land water vapor sources,and the water vapor transport path in the Extreme Arid Desert Natural Area in the Tarim Basin was holistically southerly.The result of cluster analysis revealed that the water vapor in the Altay-Tacheng Forest Grassland Natural Area came from Europe; it in the Desert Natural Area in the Junggar Basin came mainly from Central Asia,the Caspian Sea and Mongolian Plateau; and it in the Extreme Arid Desert Natural Area in the Tarim Basin came mainly from the Tarim Basin,West Asia,Central Asia and the Black Sea; ③ After judging the water vapor replenishment by specific humidity,the backtracking path became short,and the water vapor came mainly from Central Asia,the Black Sea,Caspian Sea and nearby land.The water vapor transmission from the main sources needed 3.5 days in average.Seasonally,the water vapor sources were the closest in summer and far in autumn.Regionally,the sources were the farthest in the Altay-Tacheng Forest Grassland Natural Area and the closest in the Hami-Turpan Desert Natural Area; ④ Precipitation in Xinjiang was mainly affected by the northerly and southerly westward airflows,and the northward westward airflow contributed more than the southerly westward one.

Key words: short-time heavy rainfall, HYSPLIT trajectory model, water vapor source, atmospheric circulation field, backtracking, Xinjiang

ZHANG Ya-ning, ZHANG Ming-jun, WANG Sheng-jie, DU Ming-xia, MA Rong, ZHOU Su-e, MENG Hong-fei, YU Xiu-xiu. Water Vapor Sources of Short-Time Heavy Rainfall in Xinjiang Based on Specific Humidity-Adjusted Lagrangian Modelel[J].Arid Zone Research, 2019, 36(3): 698-711.

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Water Vapor Sources of Short-Time Heavy Rainfall in Xinjiang Based on Specific Humidity-Adjusted Lagrangian Modelel

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