毫米波云雷达与激光云高仪观测数据对比分析

摘要

2013年5月1日至6月8日，中国气象局气象探测中心在中国气象局大气探测综合试验基地进行了云高观测试验，试验仪器包括：（1）毫米波云雷达（35 GHz），观测数据为回波功率值，时间分辨率1 min；（2）激光云高仪，观测数据为后向散射光强度，时间分辨率为1 min；本工作对39天试验数据进行对比分析，结果表明：毫米波云雷达数据获取率要比激光云高仪的数据获取率高26％；在雾霾天气时激光云高仪的数据获取率比毫米波云雷达低51％；降水天气对激光云高仪测量云底高度的结果影响较大，对云雷达的测量的结果影响较小；毫米波云雷达和激光云高仪测得云底高度平均相差不超过300 m，比较接近。%From 1 May to 8 June 2013 CMA Meteorological Observation Centre conducted an experiment of cloud height observations by using cloud radar (35 GHz),whose observation data are the echo power value and temporal resolution is 1 min and a ceilometer whose observation data are the back-scattering intens da-ta with 1 min temporal resolution.The result of analyzing the data observed from the 39 d experiment indi-cates that:(1 )the data acquisition ratio of cloud radar is 2 6% larger than that of ceilometer;(2 )the ratio is 5 1% in fog-haze weather;(3 )relatively,precipitation has more significant effect on cloud base height measured by laser ceilometer than that by cloud radar;(4)height of cloud base measured by cloud radar is almost consistent with the height by ceilometer because their average deviation is less than 300 m.