Wang Menghua, Shi Wei, Jiang Lide
NOAA National Environmental Satellite, Data, and Information Service, Center for Satellite Applications andResearch, Camp Springs, Maryland 20746, USA.
Opt Express. 2012 Jan 16;20(2):741-53. doi: 10.1364/OE.20.000741.
A regional near-infrared (NIR) ocean normalized water-leaving radiance (nL(w)(λ)) model is proposed for atmospheric correction for ocean color data processing in the western Pacific region, including the Bohai Sea, Yellow Sea, and East China Sea. Our motivation for this work is to derive ocean color products in the highly turbid western Pacific region using the Geostationary Ocean Color Imager (GOCI) onboard South Korean Communication, Ocean, and Meteorological Satellite (COMS). GOCI has eight spectral bands from 412 to 865 nm but does not have shortwave infrared (SWIR) bands that are needed for satellite ocean color remote sensing in the turbid ocean region. Based on a regional empirical relationship between the NIR nL(w)(λ) and diffuse attenuation coefficient at 490 nm (K(d)(490)), which is derived from the long-term measurements with the Moderate-resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite, an iterative scheme with the NIR-based atmospheric correction algorithm has been developed. Results from MODIS-Aqua measurements show that ocean color products in the region derived from the new proposed NIR-corrected atmospheric correction algorithm match well with those from the SWIR atmospheric correction algorithm. Thus, the proposed new atmospheric correction method provides an alternative for ocean color data processing for GOCI (and other ocean color satellite sensors without SWIR bands) in the turbid ocean regions of the Bohai Sea, Yellow Sea, and East China Sea, although the SWIR-based atmospheric correction approach is still much preferred. The proposed atmospheric correction methodology can also be applied to other turbid coastal regions.
针对包括渤海、黄海和东海在内的西太平洋区域的海洋颜色数据处理中的大气校正，提出了一种区域近红外（NIR）海洋离水辐射率（nL(w)(λ)）模型。我们开展这项工作的动机是利用韩国通信、海洋和气象卫星（COMS）上搭载的静止海洋彩色成像仪（GOCI），在高浑浊的西太平洋区域获取海洋颜色产品。GOCI有8个从412至865纳米的光谱波段，但没有浑浊海洋区域卫星海洋颜色遥感所需的短波红外（SWIR）波段。基于近红外nL(w)(λ)与490纳米处的漫衰减系数（K(d)(490)）之间的区域经验关系（该关系是根据搭载在Aqua卫星上的中分辨率成像光谱仪（MODIS）的长期测量得出的），开发了一种基于近红外的大气校正算法的迭代方案。MODIS-Aqua测量结果表明，采用新提出的近红外校正大气校正算法得出的该区域海洋颜色产品与采用短波红外大气校正算法得出的结果匹配良好。因此，尽管基于短波红外的大气校正方法仍然更受青睐，但所提出的新大气校正方法为渤海、黄海和东海的浑浊海洋区域中GOCI（以及其他没有短波红外波段的海洋颜色卫星传感器）的海洋颜色数据处理提供了一种替代方法。所提出的大气校正方法也可应用于其他浑浊的沿海区域。
