Dr. Max Moreno has article published in the International Journal of Remonte Sensing. Read the abstract below:
Although satellite technology promises great usefulness for consistent monitoring of chlorophyll-α concentration in estuarine and coastal waters, the complex optical properties commonly found in these types of waters seriously challenge the application of this technology. Blue-green ratio algorithms are susceptible to interference from water constituents, different to phytoplankton, that dominate the remote sensing signal. Alternatively, modelling and laboratory studies have not shown a decisive position on the use of near-infrared (NIR) algorithms based on the sun induced chlorophyll fluorescence signal. In an analysis of a multi-year (2003-2010) in situ monitoring data set from Tampa Bay, Florida (USA), as a case, this study assess the relationship between the fluorescence line height (FLH) product from the Moderate Resolution Imaging Spectrometer (MODIS) and chlorophyll-α.
The determination coefficient (r2) at individual sites ranged between 0.67 (n = 28, p < 0.01) and no relationship. Overall, there was no good relationship between in situ chlorophyll-α and the FLH product (r2= 0.20, n=507). Nevertheless, the low determination coefficient obtained was still eight times higher than that between in situ chlorophyll-α and OC3M, the standard product traditionally used to estimate chlorophyll-α in ocean waters, which is based on the blue-green section of the spectrum. A better relationship of r2=0.4 (n=93) was obtained by using only sites located at least 5 km from shore and bridges and with depths ≥ 3.2 m. Although these results from Tampa bay did not demonstrate a consistent spatial applicability of MODIS FLH on estuarine waters, a few good determination coefficients found in particular sites (r2 = 0.67, 0.64 and 0.49; n = 28, 11 and 13, respectively) show that good relationships can be achieved.