Impact removal of marine suspended sediment on estimate of chlorophyll-a pigment concentration

Determining precisely what portion of upwelling water leaving radiance attributed to chlorophyll-a pigment alone is a complex undertaking. The suspended sediment reflect more radiance than chlorophyll-a normally. The calculation of chlorophyll-a using maximum ratio of SeaWIFS band 2/5, band 3/5 and band 4/5 according to OC4 algorithm gets low accuracy on coastal zone, which is rich suspended sediment distribution impact. An improved approach is developed to remove the impact of suspended sediment and dissolved organism on chlorophyll-a pigment estimate. The SeaWIFS band 6 with spectrum 660-680 mum, on which the low reflectance of chlorophyll-a pigment is distributed, is applied to detect suspended sediment, the spectral curve model of different suspended sediment concentration is measured in situ and demonstrates that different suspended sediments have a prominent spectral curve between 550-750 mum and varied spectral curve slope, these curve model has been added to the chlorophyll-a concentration calculation algorithm. The correction evaluation of suspended sediment for chlorophyll-a calculation is made to assess the correction quality, the in situ samples of chlorophyll-a are compared with uncorrected chlorophyll-a map and corrected chlorophyll-a map, the results shows that suspended sediment for chlorophyll-a has improved about 5% of accuracy of chlorophyll-a concentration