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APPLICATION OF THE SEAWIFS OC4 CHLOROPHYLL ALGORITHM TO THE WATERS OF NARRAGANSETT BAY, RHODE ISLAND
Citation:
Keith, D J., J. A. Yoder, S. A. Freeman, AND C. Mouw. APPLICATION OF THE SEAWIFS OC4 CHLOROPHYLL ALGORITHM TO THE WATERS OF NARRAGANSETT BAY, RHODE ISLAND. Presented at ASLO TOS Ocean Research Conference, Honolulu, HI, February 15-20, 2004.
Description:
The Ocean Chlorophyll 4 (OC4) algorithm is currently used to derive chlorophyll concentrations from SeaWiFS spectral data. The OC4 model is a modified cubic polynomial that relates a band ratio to chlorophyll concentration based on whichever remotely sensed reflectance (Rrs) ratio, Rrs443/Rrs555, or Rrs490/Rrs555, or Rrs510/Rrs555 is the most dominant. The determination of chlorophyll a using OC4 in turbid and shallow estuarine (Case 2) waters has been very limited because the atmospheric correction scheme used to process satellite ocean color data generates erroneously high concentrations. In this study, the ability of the algorithm to estimate chlorophyll a in Case 2 waters is examined using in situ and airborne radiometer data unaffected by atmospheric effects.
Using OC4 version 4 (OC4v4), predicted values were compared with fluorometrically determined values of chlorophyll a. Results indicate that chlorophyll concentrations determined by the OC4v4 model (n= 149; mean = 7.33 ug per liter) are comparable to field chlorophyll a concentrations (n= 149, mean = 7.73 ug per liter).