Characteristics of Cloud Radar Echoes duuring a Freezing Rain
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Abstract:
Based on the normal observation data from 10 to 12 December 2014, ECWMF reanalysis data and Kaband millimeterwave cloud radar data, using the methods of physical diagnosis and echo characteristics analysis, the more refined vertical micro features, compared with weather radar, are obtained. The new formation and evolution observations of freezing rains in Guizhou are provided. The result shows: (1) The ground temperature in the freezing rain process was near 0 ℃. After clouds had formed, its temperature decreased with height and always maintained between -10 and 0 ℃. It is a supercooled warm rain process. (2) The echo intensity of the freezing rain increased gradually with decreasing height in the primary, maturation and extinction stages, ranging from -30 to 12 dBz. The vertical velocity of the air is concentrated in the range of -04 to 16 m/s, and the velocity of the particles falls within 24 m/s. (3) The ascending motion was weak and the particle size was small in the primary and extinction stages of the freezing rain. In the mature stage, the updraft increased, then the proportion of small particles decreased, and the number of large particles increased. In the middle and lower parts of the cloud, the large value region of the spectrum corresponded to the strong reflectivity factor, which reflects the collision growth in the falling process of supercooled liquid water.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.