Characteristic Analysis of Snowy and Freezing Weather with DopplerRadar Data
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Abstract:
From late January to early February in 2008, there occurred rare snowy and freezing weather in the northwestern Fujian. The characteristics of the snowy and freezing weather are analyzed in terms of reflectivity, echo top, radial velocity,and VWP products from Doppler radar. The results indicate: (1) The echo intensity of ice and snow is weaker than that of continuous precipitation. (2) The heights of the echo top and zero layer are relatively low. (3) There exists a structure with a shape of a cow’s eye on the radial velocity chart, which means that there existed a lowlevel jet, and a circularshaped zerovelocity line at the lower level and a Sshaped zerovelocity line at middle and upper levels, which means that there was wind shear in the lowerlayer and cold advection in the middleupper layer. (4) In the VWP chart, there existed southwestern wind at the upper level, northwestern wind at the middle level, southwestern wind at the lower level, and northeastern wind in the surface layer, which means that the “coldwarmcoldwarm” stratification structure (from the near surface to upper level) was beneficial to the formation of freezing weather.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.