Impact of Different Intensity Tropical Cyclones on Precipitation Changes in China
Received date: 2019-01-25
Revised date: 2019-05-05
Online published: 2019-07-29
Supported by
ect supported by the National Natural Science Foundation of China "Impact of binary cyclone on extreme precipitation over mainland of China"(41675042);The National Key R & D Program of China "Detection attribution of persistent heavy precipitation events in China"(2018YFC1507703)
Based on the daily precipitation data of more than 2 000 meteorological stations from 1960 to 2017 and the tropical cyclone (TC) best-track data of the China Meteorological Administration, the TC precipitation was identified by the Objective Synoptic Analysis Technique (OSAT). The research shows that the TC precipitation in China has a significant downward trend, which is slower than that of the research results 12 years ago. The TC precipitation in the peaking season (July to Sepember) accounted for 78.5% of the total TC precipitation. Both TC precipitation in peaking season and other months showed a significant downward trend. The TC precipitation climate trend is mainly characterized by reduction in spatial distribution, and shows obvious regional differences. From south to north, there is a distribution of “decreasing-increasing-decreasing”, and the decreasing trend centers are located in Guangdong and Hainan. According to the maximum intensity in the TC influence period, we classified TCs into three levels (weak TCs, medium intensity TCs and strong TCs) and studied the variations of TC precipitation in different intensities. The results show that the strong TC precipitation shows a significant decrease trend, which mainly determines the influence range and trend of TC total precipitation. Further analysis found that the frequency of affecting TC showed a significant reduction trend during the time period of 1960-2017 and an abrupt shift occurred in 1995. A comparative study of the two periods before and after 1995 showed that compared with the previous period (1960-1994), the frequency of TCs in the latter period (1995-2017) showed a significant decreasing trend in the south of 20°N. The maximum decreasing center was located in the northern part of the South China Sea, and this feature was mainly affected by the strong TC. It was decided that this trend of strong TC led to a decrease trend in the number of precipitation days in South China, especially in Guangdong and Hainan, which led to a decrease trend in TC precipitation.
Hui Yang , Fumin Ren , Ming-Jen Yang . Impact of Different Intensity Tropical Cyclones on Precipitation Changes in China[J]. Advances in Earth Science, 2019 , 34(7) : 747 -756 . DOI: 10.11867/j.issn.1001-8166.2019.07.0747
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