基于航空多角度偏振信息的近海海域非球形气溶胶光学厚度反演研究
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摘要
基于T矩阵散射理论,以中分辨率成像光谱仪(MODIS)海洋气溶胶模型细模态M4和粗模态M9为例,模拟计算了不同纵横轴比椭球形状以及等概率纵横轴比椭球形状分布的非球形粒子单次散射特性。与球形粒子进行比较,发现非球形性对细模态粒子具有起偏作用,而对粗模态粒子具有退偏作用。利用机载大气多角度偏振辐射计(AMPR)的近海海域航飞遥感数据,进行了非球形粒子和球形粒子气溶胶光学厚度的反演实验。反演结果表明,基于非球形模式得到的气溶胶光学厚度与地面太阳辐射计(Cimel,CE318)测量结果一致性较好,相对均方误差在0.1以内。
With the fine-mode state M4 and coarse-mode state M9 in the moderate-resolution imaging spectroradiometer(MODIS)ocean aerosol model as examples,the single scattering characteristics of the nonspherical particles with ellipsoidal shape distributions under different aspect ratios and equal-probability aspect ratios are simulated based on the T-matrix scattering theory.Different from the spherical particles,the nonspherical shape causes polarization for fine-mode particles and depolarization for coarse-mode particles.The offshore sea remoting data from the airborne advanced atmospheric multi-angle polarized radiometer(AMPR)are used to retrieve the optical depths of both spherical and nonspherical aerosols.The retrieval results show that the optical depth obtained based on the nonspherical mode is well consistent with the measurement results by the sun-sky radiometer on earth(Cimel,CE318)and the relative root-mean-square error is smaller than 0.1.
With the fine-mode state M4 and coarse-mode state M9 in the moderate-resolution imaging spectroradiometer(MODIS)ocean aerosol model as examples,the single scattering characteristics of the nonspherical particles with ellipsoidal shape distributions under different aspect ratios and equal-probability aspect ratios are simulated based on the T-matrix scattering theory.Different from the spherical particles,the nonspherical shape causes polarization for fine-mode particles and depolarization for coarse-mode particles.The offshore sea remoting data from the airborne advanced atmospheric multi-angle polarized radiometer(AMPR)are used to retrieve the optical depths of both spherical and nonspherical aerosols.The retrieval results show that the optical depth obtained based on the nonspherical mode is well consistent with the measurement results by the sun-sky radiometer on earth(Cimel,CE318)and the relative root-mean-square error is smaller than 0.1.
引文
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[2]Kuik F.Single scattering of light by ensembles of particles with various shapes[D].Netherlands:Vrije Universiteit Amsterdam,1992.
[3]Mishchenko M I,Geogdzhayev I V,Liu L,et al.Aerosol retrievals from AVHRR radiances:effects of particle nonsphericity and absorption and an updated long-term global climatology of aerosol properties[J].Journal of Quantitative Spectroscopy and Radiative Transfer,2003,79:953-972.
[4]Dubovik O,Holben B N,Lapyonok T,et al.Nonspherical aerosol retrieval method employing light scattering by spheroids[J].Geophysical Research Letters,2002,29(10):54.
[5]Hasekamp O P,Litvinov P,Butz A.Aerosol properties over the ocean from PARASOL multiangle photopolarimetric measurements[J].Journal of Geophysical Research,2011,116:D14204.
[6]Herman M,DeuzéJ L,Marchand A,et al.Aerosol remote sensing from POLDER/ADEOS over the ocean:improved retrieval using a nonspherical particle model[J].Journal of Geophysical Research:Atmospheres,2005,110:D10S02.
[7]Mishchenko M I.Light scattering by randomly oriented axially symmetric particles[J].Journal of the Optical Society of America A,1991,8(6):871-882.
[8]Yee K N.Numerical solution of initial boundary value problems involving Maxwell′s equations in isotropic media[J].IEEE Transactions on Antennas and Propagation,1966,14(3):302-307.
[9]Yurkin M A,Maltsev V P,Hoekstra A G.The discrete dipole approximation for simulation of light scattering by particles much larger than the wavelength[J].Journal of Quantitative Spectroscopy and Radiative Transfer,2007,106(1/2/3):546-557.
[10]Mishchenko M I.Light scattering by size-shape distributions of randomly oriented axially symmetric particles of a size comparable to a wavelength[J].Applied Optics,1993,32(24):4652-4666.
[11]Breon F M,Tanre D,Lecomte P,et al.Polarized reflectance of bare soils and vegetation:measurements and models[J].IEEE Transactions on Geoscience and Remote Sensing,1995,33(2):487-499.
[12]Waquet F,Goloub P,DeuzéJ L,et al.Aerosol retrieval over land using a multiband polarimeter and comparison with path radiance method[J].Journal of Geophysical Research:Atmospheres,2007,112:D11214.
[13]Remer L A,Kaufman Y J,TanréD,et al.The MODIS aerosol algorithm,products,and validation[J].Journal of the Atmospheric Sciences,2005,62(4):947-973.
[14]Wang H,Sun X B,Sun B,et al.Evaluation of land surface polarization models based on airborne advanced atmosphere multi-angle polarization radiometer measurements[J].Acta Optica Sinica,2014,34(1):0123002.王涵,孙晓兵,孙斌,等.基于航空多角度偏振辐射计遥感数据评估陆地表面偏振反射模型[J].光学学报,2014,34(1):0123002.
[15]Cox C,Munk W.Measurement of the roughness of the sea surface from photographs of the sun′s glitter[J].Journal of the Optical Society of America,1954,44(11):838-850.