Relationship between remote sensing reflectance and optically active substances in case 1 and case 2 waters

David Allen Phinney; Douglas I. Phinney; Charles S. Yentsch

doi:10.1117/12.266394

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6 February 1997 Relationship between remote sensing reflectance and optically active substances in case 1 and case 2 waters

David Allen Phinney, Douglas I. Phinney, Charles S. Yentsch

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Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266394
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

Remote sensing reflectance, as the ratio of upwelling radiance to downwelling irradiance (L_u/E_d), was measured in a variety of oceanographic regimes representing Case 1 and Case 2 waters during 6 cruises in 1995-1996 using a Satlantic TSRB II buoy. The data set includes reflectance in seven bands, CDOM and particulate absorption, chlorophyll concentration and total suspended solids from the coastal and offshore waters of the Arabian Sea, coastal waters and deep basins of the Gulf of Maine and clear shallow waters of the Dry Tortugas in the Florida Keys. Chlorophyll concentrations vary by two orders of magnitude, k values vary by one order of magnitude and yellow substance absorption ranged from near zero in the oligotrophic offshore waters of the Indian Ocean to > 5 m^-1 in the freshwater outflow from the rivers of the southern Gulf of Maine. Buoy data were reduced to one minute averages, with the in-air downwelling irradiance data corrected for refraction/reflection at the air-sea interface as a function of sun angle and propagated to the depth of the upwelling sensor before the ratio of L_u/E_d was calculated for each band. Stations were classified on the basis of the shape and amplitude of the spectral reflectance curves. Modeled curves developed from the concentrations of optically active substances showed good agreement with measured curves. CZCS-like band ratio algorithms for chlorophyll performed very well in Case 1 waters, but high CDOM concentrations invalidate these algorithms.

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David Allen Phinney, Douglas I. Phinney, and Charles S. Yentsch "Relationship between remote sensing reflectance and optically active substances in case 1 and case 2 waters", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266394

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