可见光/红外全天空成像仪和云雷达联合反演云高  

Joint inversion of cloud height by visible/infrared full sky imager and cloud radar

作　　者：苏源 吴林林[2] 陶法 胡树贞[3] 程欣 SU Yuan;WU Linin;TAO Fa;HU Shuzhen;CHENG Xin(Hefei Meteorological Bureau National Basic Weather Station,Hefei 230041,China;Weather Modification Office of Anhui Province,Hefei 230031,China;Meteorological Observation Center,China Meteorological Administration,Beijing 100081,China)

机构地区：[1]合肥市气象局,安徽合肥230041 [2]安徽省人工影响天气办公室,安徽合肥230031 [3]中国气象局气象探测中心,北京100081

出　　处：《大气与环境光学学报》2023年第2期89-98,共10页Journal of Atmospheric and Environmental Optics

基　　金：合肥市气象科研项目;合肥市气象局自立课题(HFZL202206)。

摘　　要：为解决大部分设备无法单独获取全天空云底高度的问题,基于中国气象局大气探测基地可见光/红外天空成像仪和毫米波云雷达2019年6月的灰度值与云底高度数据,利用辐射传输模式计算地面8~14μm波段向下红外辐射随天顶角的变化关系,并根据红外波段测得的天顶云底灰度值与非天顶位置的天顶角余弦灰度值之间的线性关系,从而反演得到全天空云底高度。结果表明:(1)相比于全天无云的情形,在一天的相同时间时,全天有云时的天顶灰度值较高。(2)当云底高度为2000 m以上且云层较厚时,云底高与红外模块所测灰度值的相关性明显好于云层较薄的低云。(3)2019年8月12日的个例验证结果显示,反演云高与通过云雷达测得的实际云高相关系数为0.956,而与取天顶附近约30°天顶角得到的云高相关系数为0.9508。In order to solve the problem that most of the equipments cannot obtain the whole sky cloud base height independently,based on the grey value and the cloud base height data measured by the visible/infrared sky imager and the millimeter wave cloud radar measured at the China Meteorological Administration Atmosphere Detection Base in June,2019,the relationship between the downward infrared radiation of ground in 8-14μm band iand the zenith angle is calculated using Santa Barbara DISORT Atmospheric Radiative Transfer mode,and then according to the linear relationship between the gray value of the zenith cloud base measured in the infrared band and the cosine gray value of the zenith angle at the non-zenith position,the cloud base height of the whole sky is retrieved.The results show that,(1)compared with that in cloudless day,the zenith gray value is higher when there is cloud all day at the same time during a day.(2)When the cloud base height is more than 2000 meters and the cloud base is thick,the correlation between the cloud base height and the gray value measured by the infrared module is significantly better than that of the low clouds with thin cloud layer.(3)The case verification on August 12,2019 shows that the correlation coefficient is 0.956 between the inversion cloud height and the actual cloud height measured by cloud radar,while the correlation coefficient between the inversion of cloud height and the cloud height obtained by taking the zenith angle of about 30°near the zenith is 0.9508.

关 键 词：全天空成像仪 云雷达 灰度值 云底高 

分 类 号：P414.91[天文地球—大气科学及气象学]