摘要
为探究多角度偏振在紫外波段对气溶胶层高(ALH)的探测能力,在不同的观测几何、气溶胶和地表类型等条件下系统评估了多角度偏振在紫外波段的ALH反演信息量。基于最优估计理论和信息量分析方法,分析了紫外波段365 nm和388 nm两个通道模拟仿真数据对ALH的灵敏度,并进一步讨论了不同观测组合对ALH信息量和后验误差的影响。研究结果表明:(1)多角度偏振观测可有效提高ALH反演的信息量。(2)多角度卫星观测信息量随观测角度个数的增加显著提升,当反演中使用的角度数增加到5个时,ALH的信号自由度(DFS)提升了0.4以上。(3)添加388 nm波段偏振观测或365 nm波段强度观测这两种方案均能提升ALH的DFS。但相对而言,偏振观测方案受气溶胶模型误差影响更小,能更好地提升ALH反演的信息量,尤其是改善了低气溶胶光学厚度(AOD)条件下的ALH反演。
To explore the detection ability of the multiangle polarimetric remote sensing measurements in the ultraviolet band for aerosol layer height(ALH),the ALH retrieval information has been systematically evaluated under different observation conditions using the multiangle polarimetric measurements in ultraviolet bands.Based on the optimal estimation theory and the information content analysis method,the sensitivity of the ALH to the observations of 365 nm and 388 nm bands has been analyzed,and the impacts of different conditions on the information content and posterior error of ALH have also been assessed.The results show that:(1)The information content for ALH retrieval is significantly improved by adding multi-angle polarimetric measurements.(2)The information content increases significantly with the increase of the number of viewing angles,and the degree of freedom for signal(DFS)for ALH retrieval can be improved by more than 0.4.(3)Both the addition of polarization observation at 388 nm and the intensity observation at 365 nm can improve the DFS of ALH,however,compared to the intensity observation,the polarization observation shows better results and is less affected by the aerosol model error.Especially,the polarization observation can improve the ALH retrieval under low aerosol optical depth(AOD)conditions.
作者
顾浩然
李正强
侯伟真
裘桢炜
刘振海
朱军
伽丽丽
罗杰
洪津
麻金继
GU Haoran;LI Zhengqiang;HOU Weizhen;QIU Zhenwei;LIU Zhenhai;ZHU Jun;QIE Lili;LUO Jie;HONG Jin;MA Jinji(State Environmental Protection Key Laboratory of Satellite Remote Sensing,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100101,China;Anhui Institute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;DFH Satellite Co.Ltd,Beijing 100094,China;School of Geography and Tourism,Anhui Normal University,Wuhu 241003,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《大气与环境光学学报》
CAS
CSCD
2023年第4期357-370,共14页
Journal of Atmospheric and Environmental Optics
基金
国家杰出青年科学基金(41925019)
国家自然科学基金(41871269)
国家自然科学基金(42175148)
航天预研项目(D010206)。
关键词
气溶胶边界层高度
最优化估计反演
信息量分析
后验误差
aerosol layer height
optimal estimation inversion
information content analysis
posteriori error
