Chongqing Climate Center
The spatial and temporal distribution characteristics of precipitation in Chongqing area, especially the spatial and temporal distribution characteristics of hourly heavy precipitation, were analyzed by using the 0.1 degree resolution satellite fusion precipitation data provided by the National Meteorological Information Center from 2008 to 2016. The results show that: (1) the annual average precipitation is generally low in the West and high in the east, and the large value centers are located in the northeast and southeast of Chongqing, and there is a certain seasonal difference. Especially in summer, the precipitation in the west is significantly increased, and the total precipitation is two high (west, east) and one low (middle) distribution; precipitation frequency, precipitation intensity and topography. The frequency of precipitation in the lower and middle mountain areas with higher altitude (altitude > 1000m) is more than that in the basin and hilly areas (altitude < 1000m). The intensity of precipitation is contrary to it, and the hourly heavy precipitation mainly occurs in the transition area in front of the windward slope, which indicates that precipitation is easy to occur in the high altitude area, but the intensity of precipitation is higher. It is not strong, and the uplift of terrain is an important reason for triggering heavy precipitation, leading to precipitation in front of the mountains is significantly greater than in the mountains. (2) The precipitation in Chongqing is mainly concentrated in May-September. The precipitation, precipitation intensity and hourly heavy precipitation frequency are all single-peak distribution. The peak value appears in June-July, and the precipitation frequency is bimodal distribution. One peak value appears in May-June, the other peak value appears in October, July-August is low-frequency period, and the sunny and high-temperature days under the control of the subtropical high. Gas is related. (3) There are obvious diurnal variation characteristics of precipitation in Chongqing area. The precipitation is mainly night rain, and the time of peak precipitation appears eastward delay. The peak precipitation appears in the west at 02:00 am, in the middle at 05:00 am, in the east at 08:00 am. The diurnal variation of precipitation in spring, autumn and winter shows a single peak distribution, mainly concentrated. In the early morning and summer, there is a sub-peak at about 17:00 PM due to the local convective weather in the afternoon.