1. 北京大学地球与空间科学学院，北京 100871 2. Earth System Science Interdisciplinary Center，University of Maryland，College Park 20740，USA 3. 北京大学空间信息集成与3S工程北京市重点实验室，北京 100871 4. 首都师范大学信息工程学院，北京 100037
Multi-Angular Polarized Characteristics of Ocean Aerosol
CHEN Wei1, 2, 3, YAN Lei1, 3*, YANG Shang-qiang1, 3, 4
1. School of Earth and Space Sciences, Peking University, Beijing 100871, China 2. Earth System Science Interdisciplinary Center, University of Maryland, College Park 20740, USA 3. Beijing Key Lab of Spatial Information Integration & Its Applications, Peking University, Beijing 100871, China 4. College of Information Engineering, Capital Normal University, Beijing 100037, China
摘要： 海洋气溶胶是对流层气溶胶的重要组成部分，对全球的辐射收支平衡及气侯变化均有重要的影响。评价气溶胶的直接与间接辐射效应需要对气溶胶的性质进行深入的研究。多角度偏振为气溶胶光学物理性质研究提供了新的方法。在对可见光550 nm和近红外860 nm波段处海洋气溶胶的光学性质的研究基础上，采用矢量辐射传输模型模拟了TOA（top of atmosphere）反射率和偏振反射率与下垫面性质、观测方位角、气溶胶光学厚度之间的敏感性。模拟结果表明，海洋型气溶胶的多角度偏振信息可以有效地体现气溶胶的光学性质，可以利用多角度偏振遥感信息进行海洋气溶胶的反演，为利用多角度偏振遥感数据进行海洋气溶胶提供了理论基础。
关键词：海洋气溶胶;偏振;矢量辐射传输模型
Abstract：Ocean aerosol is an important component of troposphere aerosol, playing an important role in the global radiative balance and global climate change. To evaluate the direct and indirect radiative effects of aerosol needs deep research on aerosol properties. Multi-angular polarization provides a new method to retrieve aerosol optic and microphysical properties of aerosol. On the basis of the research on optic properties of ocean aerosol at the wavelength of 550 and 860 nm, a vector radiative transfer model was used to simulate the reflectance and polarized reflectance at the top of atmosphere. The sensitivity of reflectance and polarized reflectance to underlying surface, viewing azimuth and aerosol optic depth are evaluated. The simulation results show that the multi-angular polarization information could effectively provide information about the ocean aerosol, which suggests a useful way for ocean aerosol retrieval. Based on the studies of sensitivity, the theory of using multi-angular polarized remote sensing data to retrieve aerosol information is proposed.
Key words：Ocean aerosol;Polarization;Vector radiative transfer model
[1] Albrecht B A. Science, 1989, 245(4923): 1227. [2] Ramanathan V, Carmichael G. Nature Geoscience, 2008, 1(4): 221. [3] King M D, Kaufman Y J, Tanre D, et al. Bulletin of the American Meteorological Society, 1999, 80(11): 2229. [4] Geogdzhayev I V, Mishchenko M I, Rossow W B, et al. Journal of the Atmospheric Sciences, 2002, 59(3): 262. [5] Chowdhary J, Cairns B, Mishchenko M, et al. Geophysical Research Letters, 2001, 28(2): 243. [6] Deuze J L, Breon F M, Devaux C, et al. Journal of Geophysical Research-Atmospheres, 2001, 106(D5): 4913. [7] Kalashnikova O V, Garay M J, Davis A B, et al. Journal of Quantitative Spectroscopy & Radiative Transfer, 2011, 112(13): 2149. [8] Waquet F, Cairns B, Knobelspiesse K, et al. Journal of Geophysical Research-Atmospheres, 2009, 114. [9] Chowdhary J, Cairns B, Travis L D. Journal of the Atmospheric Sciences, 2002, 59(3): 383. [10] Hasekamp O P, Litvinov P, Butz A. Journal of Geophysical Research-Atmospheres, 2011, 116.
