IMOS - Satellite Remote Sensing - MODIS - 01 day - Chlorophyll-a concentration (GSM model)

The Aqua satellite platform carries a MODIS sensor that observes sunlight reflected from within the ocean surface layer at multiple wavelengths. These multi-spectral measurements are used to infer the concentration of chlorophyll-a (Chl-a), most typically due to phytoplankton, present in the water. There are multiple retrieval algorithms for estimating Chl-a. These data use the Garver-Siegel-Maritorena (GSM) method implemented in the SeaDAS processing software l2gen and described in “Chapter 11, and references therein, of IOCCG Report 5, 2006, (http://ioccg.org/wp-content/uploads/2015/10/ioccg-report-05.pdf).Production of contemporary MODIS data ceased at 2024/12/26. Users requiring similar Ocean Colour Radiometry data beyond 2024 should consider the VIIRS instruments on the SNPP and NOAA20+ series of satellites, also provided by IMOS.

Aqua卫星平台搭载了中分辨率成像光谱仪（MODIS），该传感器可在多个波段下观测海洋表层内反射的太阳光。上述多光谱测量数据可用于反演水体中叶绿素a（Chl-a）的浓度，该物质绝大多数由浮游植物产生。当前存在多种用于估算叶绿素a浓度的反演算法。本数据集采用Garver-Siegel-Maritorena（GSM）方法，该方法已在SeaDAS处理软件的l2gen模块中实现，并见于《IOCCG报告5（2006）》第11章及其中引用文献（http://ioccg.org/wp-content/uploads/2015/10/ioccg-report-05.pdf）。当代MODIS数据的生产工作已于2024年12月26日终止。若用户需要2024年之后的同类海洋水色辐射计数据，可考虑使用由IMOS提供的、搭载于SNPP与NOAA20+系列卫星上的VIIRS传感器。