Characteristic and Causal Analysis of Concentrated and Frequently Occurring Intense Rainfall in Tibet in 2012-2018
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Abstract:
This paper adopts the precipitation data of 74 meteorological stations in Tibet from 2012 to 2018, as well as the hourly, daily, monthly, seasonal, and annual precipitation data of Modog Station to analyze the spatial distribution of precipitation days, cumulative precipitation, and intense rainfall in Tibet. The results show that Medog is the precipitation center of Tibet, with the most precipitation days and the largest accumulated precipitation, and it is also the area with the highest probability of extreme intense precipitation. The precipitation in Medog is mainly concentrated from March to October, and the precipitation presents a dualpeak pattern, with peaks appearing in June and September, respectively. The precipitation in September has a high correlation with the annual precipitation. The rainstorms occur most frequently in Medog in May, August, and September. The number of rainstorm days increases sharply in May, which was equivalent to the number of rainstorm days in August and September. The dry and wet seasons of Medog are distinct, and there occur night rains frequently. The probability of rainfall from 03:00 to 07:00 presents 50% or above. Medog is located at the southernmost tip of Tibet, with the altitude rising from the lowest 115 meters to 1200 meters. The humid air currents from the Indian Ocean drive along the Yarlung Zangbo Valley. The uplift of the terrain makes the precipitation in Medog comparable to that of coastal cities at the same latitude in China.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.