COSMIC掩星反演湿温廓线质量的时空分析  

Temporal and Spatial Analysis of COSMIC Occultation Inversion of Wet Temperature Profile Quality

作　　者：王耀兴 张秋昭[1,2] 沈震 WANG Yaoxing;ZHANG Qiuzhao;SHEN Zhen(Jiangsu Key Laboratory of Resources and Environmental Information Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Environment Science and Spatial Informatics,C'hina University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学江苏省资源环境信息工程重点实验室,江苏徐州221116 [2]中国矿业大学环境与测绘学院,江苏徐州221116

出　　处：《武汉大学学报（信息科学版）》2021年第6期887-894,共8页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41874040,41774026);江苏高校优势学科建设工程资助项目(PAPD)。

摘　　要：为研究COSMIC(constellation observing system for meteorology,ionosphere and climate)掩星反演湿温廓线的质量,需对数据误差特性进行量化研究。首先采用线性插值的方法,以时间窗3 h、水平距离300 km为匹配准则,对0.2~30 km各高度层温度的平均偏差和标准差进行统计分析,研究随海拔高、季节和纬度带变化的温度平均偏差特性。然后采用2016年的全球探空数据集分析全球区域的COSMIC湿温廓线质量,以及北温带COSMIC湿温廓线质量随季节变化的特点,探究不同纬度带地区COSMIC掩星湿温廓线质量随纬度变化的特点。结果表明,全球范围内温度平均偏差为-0.16 K,掩星数据和探空站资料精度相当;季节变化的统计量F=0.999 6>0.05,该因素对COSMIC湿温廓线质量影响不显著;纬度带变化的统计量F=0.024 4<0.05,该因素对COSMIC湿温廓线质量有显著影响,尤其是热带地区受水汽影响较大,温度平均偏差处于峰值,偏差高于0.25 K,南温带地区次之。Objectives:In order to study the wet temperature profile quality of COSMIC(constellation observing system for meteorology,ionosphere and climate) occultation inversion,statistical analysis of data error characteristics is needed.Methods:Firstly,the linear interpolation method is used to analyze the average deviation and standard deviation of each layer temperature of 0.2-30 km with time window 3 h and horizontal distance 300 km as matching criteria.The temperature average deviation characteristics treat as a function of altitude,season and latitude are studied.Then,through the use of 2016 annual IGRA(integrated global radiosonde archive) sounding data,the COSMIC wet temperature profile quality in the global region is analyzed,and the characteristics of the COSMIC wet temperature profile quality in the north temperate zone are sorted out.The COSMIC occultation wet temperature profile in different latitude zones is explored.The characteristics of quality are treat as a function of latitude.Results:The results show that the average temperature deviation in the global range is-0.16 K,the deviation is lower than 0.2 K,and the COSMIC occultation wet temperature profile quality is similar to the sounding accuracy.The seasonal variation statistic F=0.999 6>0.05,this factor has no significant effect on the COSMIC wet temperature profile quality.The statistic of the latitude band change F=0.024 4<0.05,which has a significant effect on the COSMIC wet temperature profile quality.In particular,the tropical region is greatly affected by water vapor,the average temperature deviation is at the peak,the deviation is higher than 0.25 K,and the southern temperate zone is second.Conclusions:This paper carries out experimental analysis and reveals the error characteristics of GNSS occultation technology detection data,including two different dimensions of time and space,which will promote research in the fields of air weather monitoring and climate change.

关 键 词：COSMIC掩星 探空数据 湿温廓线 显著性检验 

分 类 号：P228.42[天文地球—大地测量学与测量工程]