MP-3000A型地基微波辐射计的资料质量评估和探测特征分析  

Assessment and Characteristics of MP-3000A Ground-Based Microwave Radiometer

作　　者：韩珏靖[1] 陈飞[1] 张臻[2] 赵云武[1] 

机构地区：[1]苏州市气象局,苏州215131 [2]中国科学院寒区旱区环境与工程研究所,兰州730060

出　　处：《气象》2015年第2期226-233,共8页Meteorological Monthly

基　　金：国家自然科学基金项目(411391001);江苏省气象科研基金项目(KM201408);苏州市2011年度科技发展计划项目(ss201119);苏州市气象局自立科研课题项目(sz201202和sz201301)共同资助

摘　　要：应用常规探空、MP-3000A型地基微波辐射计和自动气象站数据,比较了微波辐射计与探空的差异,温度和相对湿度的平均观测偏差分别为3.2℃和29%,相关系数分别为0.98以上和0.5左右。分析了不同天气下微波辐射计的探测特征,发现相对湿度和液态水含量的垂直变化与降水、强对流和大雾的发生有良好对应:降水和强对流过程中,6 km以下的相对湿度提前增大（湿度增大的提前时间在降水中较长,在强对流中较短）,3.5 km以下液态水含量增加,尤其在2.25³.25 km处有明显的激增;大雾伴随3³.5 km以下相对湿度增大和1.5 km以下液态水含量激增。A指数和对流性稳定指数(I_conve指数在出现明显降水后可能失去指示意义,在刚开始降水（尤其是明显降水）阶段及大雾中表现良好。The difference and correlation between microwave radiometer and radiosonde are presented in this paper,based on conventional sounding,MP-3000 A ground-based microwave radiometer and automatic station data.Result shows temperature and relative humidity differences from Suzhou ground-based microwave radiometer are 3.2℃ and 29%respectively,while correlation coefficients are above 0.98 and around 0.5 accordingly.Analysis of signature for microwave radiometer observations in different weather conditions illustrates that there is a good correspondence between the vertical variations of relative humidity,liquid water content and the rainfall,severe weather,and fog.In precipitation and strong convection cases,relative humidity below 6 km increases ahead of the weather process(lead time of increase in relative humidity in rainfall case is longer than that in severe convection case),liquid water content below 3.5 km rises rapidly,especially in the height from 2.25 to 3.25 km.However,in fog cases,increase of relative humidity is below 3 — 3.5 km and liquid water content is below 1.5 km.A index and convective stability index may lost their indicative significance after obvious precipitation appears,but they perform well at the beginning of rainfall(especially remarkable rains) and in the fog case.

关 键 词：地基微波辐射计 探空观测 均方根偏差 液态水含量 

分 类 号：P407.7[天文地球—大气科学及气象学]