东中国海气溶胶光学性质及气溶胶模型研究

With the operational sensors of NASA SeaWiFS and MODIS, ESA MERIS, and Chinese COCTS and MERSI, satellite ocean color data products have played an irreplaceable role in ocean fisheries, marine ecological environmental monitoring and global carbon cycle. However, studies have shown that current operational atmospheric correction error is large and the derived data products cannot satisfy the needs of users in the East China Seas. It has also been pointed out that this error is rooted in the coexistence of a variety of absorbing aerosols and turbid coastal water, which make the aerosol models and near infrared correction of the operational atmospheric correction algorithm invalid in the East China seas. Therefore, in order to increase the understanding of aerosols over ocean and improve current aerosol models, based on the in-situ aerosol optical properties from AERONET, SKYNET and cruises in the East China seas, by use of Mie scattering simulation and the radiative transfer numerical simulation in a coupled ocean-atmosphere system, this project aims to analyze the aerosol optical properties over the East China seas, build the absorbing aerosol models, obtain the aerosol reflectance look-up table required in the atmospheric correction, and research on the identification of various absorbing aerosols. The application of the research results of this project will make the valid and reliable ocean color data products available in the East China seas.

随着美国SeaWiFS和MODIS、欧空局MERIS、及中国COCTS和MERSI等的业务化运行，卫星海色遥感数据产品在海洋渔业、海洋生态环境监测、全球碳循环等方面已起着不可替代的重要作用。但研究表明目前业务化海色数据在东中国海的大气校正误差大而难以满足用户需求，其误差根源在于多种吸收性气溶胶并存和大部分沿海区为浑浊甚至高浑浊水体使得业务化大气校正算法的气溶胶模型不适合和近红外校正失效。本项目针对目前对东中国海上空的气溶胶光学性质了解尚不足和大气校正气溶胶模型亟待改进的方面，基于该海区AERONET和SKYNET岸站及出海航次的气溶胶光学现场数据，分析东中国海气溶胶光学特性，建立包含强吸收性气溶胶成分的东中国气溶胶模型，利用Mie散射和大气-海洋耦合辐射传递模拟软件，建立东中国海气溶胶反射率查找表，并研究不同吸收性气溶胶的识别方法。应用该项目研究成果可获得更可靠的东中国海海色数据产品。

随着世界各国海洋水色卫星的业务化运行，卫星海色遥感数据产品在海洋渔业、海洋生态环境监测、全球碳循环等方面已起着不可替代的重要作用。但研究表明目前业务化海色数据在东中国海的大气校正误差大而难以满足用户需求，其误差根源在于多种吸收性气溶胶并存和大部分沿海区为浑浊甚至高浑浊水体使得业务化大气校正算法的气溶胶模型不适合和近红外校正失效。本项目针对目前对东中国海上空的气溶胶光学性质了解尚不足和大气校正气溶胶模型亟待改进的方面，基于该海区出海航次的气溶胶光学现场数据、以及AERONET 和SKYNET 岸基站点测量数据，分析了东中国海气溶胶光学特性，尝试建立了包含强吸收性气溶胶成分的东中国气溶胶模型，并利用Mie 散射和大气-海洋耦合辐射传递模拟软件，建立了东中国海气溶胶反射率查找表。该项目研究成果可东中国海的海洋水色大气校正算法提供参考，以期获得更可靠的东中国海海色数据产品。