近岸气溶胶散射对水色遥感器辐射偏振校正的影响

项目名称： 近岸气溶胶散射对水色遥感器辐射偏振校正的影响

项目编号： No.41306185

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 王舒鹏

作者单位： 国家卫星气象中心

项目金额： 26万元

中文摘要： 随着人类活动对海洋尤其是近岸水体生态环境的影响日益增加，利用海洋遥感手段实现近岸水体环境监测及预警，受到广泛关注。为了满足离水辐亮度产品精度在±5%以内的应用需求，需要对由传感器的偏振灵敏度引起的测量误差进行校正（以下简称偏振校正）。在校正中忽略气溶胶散射的偏振贡献可能会导致离水辐亮度明显低估。开阔海域的气溶胶模式以非吸收性的海盐气溶胶为主，近岸水体的气溶胶模式可能包含如煤烟等吸收性很强的气溶胶粒子，在传感器偏振校正中需要区分对待。相比开阔海域，近岸水体的大气校正也更为复杂。本项目旨在利用MODIS水色波段分析气溶胶散射对近岸水体遥感辐射偏振校正的影响。建立近岸气溶胶模式库，基于矢量辐射传输模式对传感器观测值进行偏振校正；进而通过近岸水体大气校正得到离水辐亮度产品，并通过SEAWIFS相关产品对其进行验证。本项目的实施可以对我国未来海洋水色传感器更好发挥对近岸水体监测及预警效能提供支持。

中文关键词： 偏振校正；近岸气溶胶；水色遥感；近岸浑浊水体；

英文摘要： With the increasing influences of human activity on ocean environment particularly on the coastal waters, the use of ocean remote sensing for coastal environment monitoring and forecasting receives great attention around the world. To meet the required accuracy of water-leaving radiance products within ±5%, the measurement error introduced by polarization sensitivity of satellite ocean color sensors should be corrected. In polarization correction, neglecting the polarization contributed by aerosol scattering may lead to remarkable overestimation in water-leaving radiances. Over open oceans, where maritime influences dominate, aerosols are generally nonabsorbing and mainly consist of sea salt. While aerosols over coastal waters may consist of strongly absorbing aerosols, such as smoke, which requires to be differentiated. Compared with the open ocean, atmospheric correction of coastal waters is much more complicated due to an incorrect assumption of the marine contribution in the near infrared spectrum. In this work the influence of aerosol scattering on polarization correction of satellite measurements for coastal waters will be studied based on MODIS (MODerate-resolution Imaging spectroradiometer) ocean color bands. A suite of aerosol models over coastal waters will be developed. The polarization correction fo

英文关键词： polarization correction；coastal aerosol；ocean color remote sensing；coastal turbid waters；