新疆暖季短时强降水特征

Abstract

Abstract: Based on the hourly precipitation data from the 105 meteorological stations in Xinjiang from May to September during the period of 2005-2015, the spatiotemporal characteristics of precipitation and the contribution rates of short-duration heavy rainfall (hereinafter referred to as SDHR) in Xinjiang were investigated. The results indicated that the frequency of SDHR in north Xinjiang was higher than that in south Xinjiang and higher on mountain slope than that in valleys and deserts. However, the contribution rate of SDHR in south Xinjiang was higher than that in north Xinjiang. The seasonal north-south shift of high frequency zone of SDHR was closely related to the north-south passage of solar radiation and subtropical zone from spring to autumn. The curves of monthly and ten-day average frequencies of SDHR in north Xinjiang and south Xinjiang were unimodal, but their variation was different. The monthly frequency of SDHR was increased at first and then decreased rapidly, while the ten-day one was increase rapidly but decreased slowly. There were 3 peak values of the daily variation of SDHR average frequency, the highest value occurred at 18:00-19:00 BT, the second and third ones at 22:00 BT and 08:00 BT respectively Compared with the whole Xinjiang and north Xinjiang, the occurring time and intensity of the three peak values were significantly different from those in south Xinjiang.

Key words: warm season, short-duration heavy rainfall, spatiotemporal distribution, precipitation contribution rate, Xinjiang

QIN He, CHEN Chun-yan, Ablimitijan Ablikim, LI Na. Characteristics of Short-duration Heavy Rainfall in Warm Season in Xinjiang[J].Arid Zone Research, 2019, 36(6): 1440-1449.

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Characteristics of Short-duration Heavy Rainfall in Warm Season in Xinjiang

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