基于DPC/GRASP的全球海洋气溶胶光学特性反演与性能评估  

Retrievals and performance assessment of global marine aerosol optical properties from DPC/GRASP

作　　者：金适宽 马盈盈[1,2] 王中挺 洪津 陈斐楠[4] 提汝芳 陈澄 刘震 翟思曜 龚威 JIN Shikuan;MA Yingying;WANG Zhongting;HONG Jin;CHEN Feinan;TI Rufang;CHEN Cheng;LIU Zhen;ZHAI Siyao;GONG Wei(State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430072,China;Hubei Luojia Laboratory,Wuhan 430070,China;Satellite Application Center for Ecology and Environment,Ministry of Ecology and Environment/State Environmental Protection Key Laboratory of Satellite Remote Sensing,Beijing 100094,China;Anhui Institute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;Generalized Retrieval of Atmosphere and Surface Properties-Sociétépar Actions Simplifiée,Lezennes 59260,France;School of Electronic Information,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430072 [2]湖北珞珈实验室,湖北武汉430070 [3]生态环境部卫星环境应用中心,国家环境保护卫星遥感重点实验室,北京100094 [4]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031 [5]GRASP简化股份有限公司,法国勒藏讷59260 [6]武汉大学电子信息学院,湖北武汉430072

出　　处：《大气与环境光学学报》2024年第6期680-697,共18页Journal of Atmospheric and Environmental Optics

基　　金：国家自然科学基金(42071348,42001291);湖北省重点研发计划(2021BCA220);湖北省青年拔尖人才项目(2021BCA220)。

摘　　要：研究气溶胶粒子的空间分布及其复杂的光学特性对于阐明海洋大气环境和全球气候变化具有重要意义。本研究基于高分五号02[GF-5(02)]星搭载的多角度偏振成像仪(DPC)的观测数据,并结合大气和地表特性的通用反演(GRASP)算法的Components模块,研究了全球海洋上空多种气溶胶光学特性的空间分布,并通过气溶胶自动观测网(AERONET)对结果进行了初步对比验证。结果显示,DPC/GRASP方案对海面多种气溶胶参数具有较好的反演能力。具体而言,气溶胶光学厚度(AOD)、埃斯特朗指数(AExp)、细粒子气溶胶光学厚度(FAOD)、粗粒子气溶胶光学厚度(CAOD)以及单次散射反照率(SSA)与AERONET观测结果的相关系数分别为0.961、0.848、0.837、0.914和0.750。而AOD的正平均偏差(0.034)表明,DPC/GRASP在海面上会略高估气溶胶的浓度,这主要是源于对细粒子气溶胶的略微高估。在全球空间分布上,DPC/GRASP的AOD与中分辨率成像光谱仪(MODIS)产品具有很高的一致性,这表明DPC能正确描述海面气溶胶的空间分布。本研究展示了DPC数据对全球海洋多种复杂气溶胶参数优异的监测能力,为未来大气硬件仪器的研制和气溶胶反演算法的开发提供了宝贵经验和研究基础。Studying the spatial distributions and complex optical properties of marine aerosol particles is of great significance for understanding atmospheric environment over ocean and global climate change issues.In this study,the observation data of directional polarimetric camera(DPC)onboard Gaofen-5(02)satellite and the components module of the generalized retrieval of atmosphere and surface properties(GRASP)algorithm are used to study various aerosol optical properties and their spatial distributions over ocean,and furthermore,the observation data from aerosol robotic network(AERONET)sites are used to preliminarily verify the results from DPC/GRASP.The verification results show that the retrieved various aerosol properties over ocean from DPC/GRASP have a good performance.Specifically,the correlation coefficients between the aerosol optical depth(AOD),Angstrom exponent(AExp),fine-mode AOD(FAOD),coarse-mode AOD(CAOD),and single scattering albedo(SSA)retrieved from DPC/GRASP and AERONET observation results are 0.961,0.848,0.837,0.914,and 0.750,respectively.There is a positive bias of AOD(0.034)and it indicates that the DPC/GRASP slightly overestimates the concentration of aerosols over ocean,which is mainly due to fine-mode particle.In the perspective of AOD global spatial distribution,the results of DPC/GRASP have a good consistency with the products from the Moderate Resolution Imaging Spectroradiometer(MODIS),indicating that DPC can correctly describe the spatial distribution of aerosols over ocean.This study demonstrates the good performance of DPC for monitoring various marine aerosol properties,which will provide valuable experience and research basis for the development of atmospheric hardware instruments and aerosol inversion algorithms in the future.

关 键 词：气溶胶 高分五号 多角度偏振成像仪 大气和地表特性的通用检索 海洋气溶胶反演 

分 类 号：P76[天文地球—海洋科学] TP391.9[自动化与计算机技术—计算机应用技术]