基于信息容量的FY-4A/GIIRS红外光谱探测能力研究
投稿时间:2019-05-06  修订日期:2019-09-11  点此下载全文
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罗双 上海市生态气象和卫星遥感中心上海 200030
中国气象局中国遥感卫星辐射测量和定标重点开放实验室/国家卫星气象中心北京 100081 
luoshuang_2010@163.com 
狄迪 南京信息工程大学大气物理学院江苏 南京210044  
基金项目:定标重点开放实验室课题;上海市气象局气象新苗人才培养计划 2018-2020年中国气象局中国遥感卫星辐射测量和定标重点开放实验室课题资助;上海市气象局气象新苗人才培养计划 (2018-2020年)支持
中文摘要:利用LBLRTM逐线积分模式开展不同大气状况条件下各大气参数在FY-4A/GIIRS红外通道的光谱敏感性分析,在此基础上,以信息熵和自由度为判据,对FY-4A/GIIRS高光谱探测资料所包含的温度、水汽、臭氧等大气参数信息容量进行定量化描述,从而评估FY-4A/GIIRS对大气参数的可反演能力。研究结果表明:(1) FY-4A/GIIRS长波波段对温度和水汽的敏感度与大气状况相关,而对臭氧的敏感度在不同大气状况条件下差异不大;(2) 初步揭示了FY-4A/GIIRS具备大气温湿和臭氧廓线反演的应用潜力,且相同大气条件下,FY-4A/GIIRS红外光谱所包含的温度信息容量最大,水汽其次;(3) 在热带大气条件下,FY-4A/GIIRS所包含的温度和水汽信息容量最丰富。
中文关键词:FY-4A  红外高光谱  信息熵  自由度
 
Study on FY-4A/GIIRS infrared spectrum detection capability based on information content
Abstract:The spectral sensitivities of FY-4A/GIIRS (Geosynchronous Interferometric Infrared Sounder) in various atmospheric conditions are analyzed by the use of Line-By-Line Radiative Transfer Model (LBLRTM). On that basis, the information contents of temperature, humidity and ozone in FY-4A/GIIRS are measured by Entropy Reduction (ER) and the Degrees of Freedom for Signal (DFS), which could evaluate the retrieve capabilities for atmosphere parameters of FY-4A/GIIRS. The results are shown as follows: (1) The sensitivity of temperature and humidity in long wave band of GIIRS are both varied with atmosphere condition, while there is little difference in the sensitivity of ozone under different atmospheric conditions. (2) The application potential for FY-4A/GIIRS with temperature, humidity and ozone profiles inversion is preliminary revealed. Therefore, temperature information content of FY-4A/GIIRS is the largest, followed by water vapor under the US Standard atmosphere. (3) The information content of temperature and water vapor in tropical atmosphere is bigger than middle latitude atmosphere.
keywords:FY-4A  infrared hyperspectral  entropy reduction  degrees of freedom for signals
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