基于AERONET的东沙海域气溶胶光学模型  

Aerosol Optical Model of Dongsha Area Based on AERONET

作　　者：陈舜平 戴聪明 刘娜娜 连文涛 张聪 吴凡 张宇轩 魏合理 Chen Shunping;Dai Congming;Liu Nana;Lian Wentao;Zhang Cong;Wu Fan;Zhang Yuxuan;Wei Heli(Key Laboratory of Atmospheric Optics,Chinese Academy of Sciences,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,Anhui,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,Anhui,China;School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,Anhui,China)

机构地区：[1]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中国科学院大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学研究生院科学岛分院,安徽合肥230026 [3]先进激光技术安徽省实验室,安徽合肥230037 [4]中国科学技术大学环境科学与光电技术学院,安徽合肥230026

出　　处：《光学学报》2023年第24期21-30,共10页Acta Optica Sinica

基　　金：国家自然科学基金(62105240,62075159);国家重点研发计划(2019YFA0706004);中国科学院合肥研究院院长基金(YZJJ2022QN06)。

摘　　要：使用气溶胶自动观测网(AERONET)东沙站的长期观测资料,初步建立逐月的南海东沙海域气溶胶光学特性模型。长期观测数据表明,东沙海域气溶胶光学厚度(AOD)基本低于0.5,春秋两季达到峰值,夏季最低。气溶胶粒子的有效半径在春秋两季较小,其余月份在0.5μm左右。使用三模态对数正态函数拟合区域气溶胶粒径谱,得到细模态半径为0.1μm,中间模态半径为0.28μm,粗模态半径为2.2μm。基于多波段AOD观测数据,评估该模型计算所得AOD光谱和透过率误差,可见和近红外波段透过率的均方根误差(RMSE)为1%~2%,AOD的RMSE为0.01~0.03。结果表明,所建气溶胶模型可以准确描述东沙海域的气溶胶光学特性,满足工程计算的精度要求。Objective Marine aerosol is the most important natural aerosol source,and can significantly affect radiative budget,climate change,and air quality prediction.A precise numerical model representing the optical characters of local aerosol could help much in relevant research.Photoelectric observation equipment working in the sea area is susceptible to marine aerosol,and the evaluation of its detection ability relies on an accurate aerosol optical model.There are some aerosol models applicable for this purpose,such as the navy aerosol model(NAM)and Mediterranean extinction code(MEDEX),which are based on the data acquired primarily near the sea surface at some specific field sites.It is necessary to build a counterpart model using aerosol observation data from China's sea areas.Ground-based remote sensing mainly provides the column averaged aerosol parameters,which can expand the spatial observation coverage by acting as a collaborative network like an aerosol robotic network(AERONET).We propose a tentative aerosol model based on AERONET to explore the database source in building an aerosol optical model.Methods AERONET is a commonly employed data source in aerosol-related research,such as air pollution prediction,climate changing analysis,and aerosol physics.Observation sites of AERONET are distributed around the world,making the network suitable to characterize the aerosol parameters in different geographical locations.Level 2.0 products from an island site of AERONET,Dongsha_Island,are utilized because of its relatively long temporal covering range,and the island is far enough to minimize the influence of terrestrial aerosol.An aerosol optical model is proposed based on column averaged parameters,aerosol optical depth(AOD),and retrieved size distributions from spectral and angular AOD.AODs obtained originally at 440 nm and 675 nm by CE-318 sun photometer are spectrally converted to 550 nm using Angstrom exponent derived from the AOD spectrum.Size distributions are averaged to the corresponding month to form a mont

关 键 词：大气光学 气溶胶模式 海洋气溶胶 气溶胶光学特性 AERONET 

分 类 号：P427.1[天文地球—大气科学及气象学]