关键词: 云雷达, 探空数据, 0 ℃层高度

Abstract:

In order to study the detection capability of 35-GHz cloud radar about 0 ℃ layer bright band of the atmosphere, firstly based on the 2 063 cases data detected by the cloud radar-HMBQ of Chinese Academy of Meteoological Sciences in different places from 2008 to 2012, the variation characteristics of reflectivity factor, radial velocity and linear depolarization ratio of the cloud radar under different weather conditions were analyzed, and the method that could identify the 0 ℃ isotherm height derived from the detection products of the cloud radar was improved. Results show that the cloud radar-HMBQ could detect the 0 ℃ isotherm under different weather conditions such as no rainfall cloud, weak rainfall cloud, small rainfall, moderate rain and heavy rain, and the change feature of the 0 ℃ layer bright band detected by the cloud radar was remarkble, which could make up for the shortage of the relevant information in the early warning of small scale weather system in summer including shorttime strong convection, convective monomer and so on. The improved method compared to the original one, the accuracy and time resolution were raised, it could identify the spatial and temporal change of the 0 ℃ layer bright band, and the results were in good agreement with radiosonde sounding 0 ℃ layer height.

Key words: cloud radar, sounding data, atmosphere 0 ℃ layer height