Spatio-temporal Characteristics of the Short-time Heavy Rainfall in the East of Northwest China
Bai Xiaoping1,2, Jin Shuanglong3, Wang Shigong2,4, Shang Kezheng2, Zhao Lu5
1. Unit 94195 of PLA, Dingxi 730500, Gansu, China; 2. College of Atmospheric Sciences/Ministry of Education Key Laboratory of Semi-Arid Climate Change, Lanzhou University, Lanzhou 730000, China; 3. State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems, China Electric Power Research Institute, Beijing 100192, China; 4. College of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China; 5. Earthquake Administration of Gansu Province, Lanzhou 730000, China
Abstract：In this paper, the spatio-temporal distribution and climate characteristics of short-time heavy rainfall in the east of Northwest China is studied based on every 6h rainfall observation data of 136 meteorological stations in the east of Northwest China from 2001 to 2011 and hourly precipitation data from 2009 to 2011 of 1674 automatic meteorological stations, by using climate statistical analysis, linear trend analysis, normalized analysis, subregional of statistics analysis, precipitation concentration degree (PCD) and precipitation concentration period (PCP) analysis. Results showed that the short-time heavy rainfall days interannual change is unobvious, but the regional short-time heavy rainfall process has increased significantly; the short-time heavy rainfall is mainly happened from early July to late August, and it has obvious diurnal variation; the spatial distribution of the short-time heavy rainfall frequency is accordant with the topography distribution, and high frequency area is located near the windward side of summer half year circulation prevailing southwest airflow; the PCD is more and more concentrated from southeast to northwest, and the PCP gradually postponed from east to west in the space.
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Bai Xiaoping, Jin Shuanglong, Wang Shigong, Shang Kezheng, Zhao Lu. Spatio-temporal Characteristics of the Short-time Heavy Rainfall in the East of Northwest China. JOURNAL OF DESERT RESEARCH, 2018, 38(2): 410-417.
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