微波辐射计观测同降水相关性的研究

Study on Correlations Between Microwave Radiometer Observation and Precipitation

利用南阳站微波辐射计反演产品数据,结合L波段探空、多普勒天气雷达和地面雨量等资料,分析了2017年6月4-5日南阳地区一次降水过程中水汽与液态水变化特征,并对2017年6-8月不同降水条件下该地区的水汽与液态水总含量进行了统计。结果表明:微波辐射计反演的产品数据较准确,可靠性较强,可应用于日常业务工作和科研中。降水开始前,水汽总含量与液态水总含量明显增加,随着降水减弱结束,水汽总含量与液态水总含量减少。利用这一现象,可以将水汽和液态水的变化作为选择人工影响天气作业最佳时机的辅助判别条件。对比同时刻、同位置的雷达和微波辐射计资料发现,水汽总含量和液态水总含量跃增时对应较强雷达回波。水汽总含量达到5 cm、液态水总含量达到1 mm,可以作为判断南阳地区夏季降水开始的参考值。

By using the inversion product data from the microwave radiometer of Nanyang station and the L-band sounding,Doppler weather radar and surface rainfall data,this paper analyzed the variation characteristics of water vapor and liquid water during the precipitation process in Nanyang region in 4-5 June 2017.Also,the total water vapor content and total liquid water content under different precipitation conditions from June to August 2017 were counted.The results showed that the inversion data from microwave radiometer is more accurate and reliable,and could be applied to conventional operations and researches.The total water vapor content and total liquid water content are increased significantly before it starts to rain,but get to decrease with rainfall weakening.Relying on this phenomenon,the variation of water vapor and liquid water can be used as an auxiliary discriminating condition for selecting the best timing for the operation of weather modification.Comparing the radar and microwave radiometer data from the same location at the same time,we found that the total water vapor content and total liquid water content increase correspondingly to stronger radar echoes.The total water vapor content of 5 cm and the total liquid water content of 1 mm can be used as reference values for judging the beginning of summer precipitation in Nanyang.