Abstract:
Based on the hourly rain-gauge data of 2325 national stations and regional automatic observation stations in Yunnan Province, the spatial distribution characteristics of precipitation, frequency and intensity in rainy and dry seasons of Yunnan from 2014 to 2018 are compared and analyzed. The result shows that the precipitiaon characteristics in different regions of Yunnan are significantly different due to the influence of complex terrain, and are significantly different from those in eastern China. The average annual precipitation is generally high in southwest and low in northwest. In the valleys of Nujiang River, rainfall usually peaks at night in both dry and rainy season, and the rainfall frequency is high while the rainfall intensity is weak. In the west of 99°E, the accumulated pricipitation in this area is the largest in Yunan Province.The daily variation peaks of each station in this area are relatively consistent in the morning, and are relatively rare in land areas. Over the area south of 23°N, the rainfall peaks are different. Over the central Yunnan province, the precipitation is relatively low, the precipitation frequency in this area is mainly characterized by the morning peak in the rainy season, and the peak is more prominent in the afternoon in the dry season, which is also significantly different from the diurnal variation of precipitation in eastern China.