ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 48 Issue 9 > 2022,48(9):1140-1152. DOI:10.7519/j.issn.1000-0526.2022.051602 Prev Next
Analysis of Macro Structure and Microphysical Characteristics of Snow Clouds in Northern Xinjiang Based on GPM/DPR Data
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Abstract:
Based on GPM/DPR dual-frequency precipitation radar, FY-2E satellite and surface precipitation data, the infrared brightness temperature, horizontal distribution and vertical structure characteristics of the four snowfall processes during mature period in northern Xinjiang are analyzed. The results show that the cloud top brightness temperature of the snowfall is concentrated at 210-245 K, and the snowfall clouds are mainly stratiform clouds. The middle clouds contribute the most to the precipitation intensity, and the near-surface precipitation rate is mostly distributed between 0.5-2.0 mm·h-1. The echo top height in areas with high precipitation rate is mainly concentrated in the range of 3.0-4.5 km, and there is a positive correlation between the echo top height and the variation of near-surface precipitation rate. The range of radar reflectivity factor (Z) is between 22-35 dBz, and the height of the strong echo center is mainly distributed in 1.25-4.50 km. The configuration with mass weighted average diameter (Dm) of 1.01-1.25 mm and particle number concentration (dBNw) of 32-36 contributes the most precipitation, and the corresponding heights are 2.19-2.50 km and 2.13-2.67 km. Near the surface, there are more large particles produced by the collision-convergence process, and the Dm reaches 2.33-3.00 mm near surface. Toward the surface, Z and Dm are almost constant or slightly increase, and the values of Z and Dm are positively correlated to the variation of surface rainfall.
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