Abstract:
Based on the data of DSG1 precipitation weather phenomenometer and rainfall of five national stations in Wumeng Mountain area, Guizhou Province from May to September in 2018, the microphysical characteristics and M–P spectrum characteristics of raindrop spectrum are analyzed, and the precipitation is preliminarily estimated based on the
Z–R relationship of raindrop spectrum, which lays a foundation for further discussion of cloud physical process of rainfall and more accurate quantitative precipitation estimation. The results show that the rain-drops of 1–2 mm diameter in Wumeng Mountain area contribute the greatest to the total number concentration and rain intensity (TNCARI), while the contribution of rain-drops of diameters over grade four to TNCARI could be ignored. As for the period of light rain intensity, the rain drops of 1 mm diameter contribute the greatest to rain intensity. And with the increase of rain intensity, the contribution rate of rain drops of 1 mm diameter gradually decreases, while the contribution of the particles of grades 2 and 3 is the greatest. The raindrop spectra at different altitudes basically follow the negative exponential law, and the precipitation with rain drops of diameters below 3 mm is the main factor affecting the M–P spectrum distribution; the
Z–R correlation of raindrop spectra is strong, and the estimated precipitation error is small, especially in the convective cloud precipitation process, which is closer to the actual precipitation.