| With the development of ocean color remote sensing technology, large-scale, high-frequency, long-term observations of marine elements possible, including suspended particulate matter (SPM) monitoring in estuarine and coastal waters, which is very important and practically valuable to marine environment, ecology and engineering. In this study, technical parameters and characteristics of different ocean color satellite sensor is introduced and a method developed by Shen et al.(2010b) is adopted, to retrieve SPM concentration in estuary of Yangtze River using Terra/Aqua/MODIS, FY-3A/MERSI and geostationary COMS/GOCI. Satellite data processing principles, methods and processes are elaborated. The raw data and products of the three sensors were compared to those of Envisat/MERIS, including radiance at top of atmosphere (LTOA), remote sensing reflectance (Rrs) and SPM. Furthermore, numbers of remote sensing data in2011and the beginning of2012were adopted, in purpose of studying long time variation of both polar-orbiting and stationary satellite-Derived SPM. Meanwhile, the uncertainty of polar-orbiting satellite-Derived SPM were analyzed.Generally speaking, the method developed by Shen et al.(2010b) showed good applicability and compatibility in3sensors (GOCI> MODIS>FY-3A/MERIS), whose SPM retrievals showed consistency with Envisat/MERIS-derived SPM, especially GOCI. Compared with stationary satellite, polar-orbiting satellite doesn’t receive enough information of the same area to distinguish subtle variation of SPM in time, and resulting in deviation in accuracy under some circumstance. While stationary satellite data shows diaurnal variation of SPM in estuary of Yangtze River, and SPM difference in different phases of tide. The ability of the short period of satellite observations is enhanced in study area, and time coverage gaps between satellite on-orbit and off-orbit can be filled through multi-sensor observations. |
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