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ESTIMATION OF INHERENT OPTICAL PROPERTIES AND WATER CONSTITUENT CONCENTRATIONS FROM THE REMOTE-SENSING REFLECTANCE SPECTRA IN THE ALBEMARLE-PAMLICO ESTUARY, USA
Citation:
Sokoletsky, L. AND R. S. LUNETTA. ESTIMATION OF INHERENT OPTICAL PROPERTIES AND WATER CONSTITUENT CONCENTRATIONS FROM THE REMOTE-SENSING REFLECTANCE SPECTRA IN THE ALBEMARLE-PAMLICO ESTUARY, USA. Presented at Second MERIS Users Workshop, Rome, ITALY, September 22 - 26, 2008.
Impact/Purpose:
Presentation
Description:
The decomposition of remote sensing reflectance (RSR) spectra into absorption, scattering and backscattering coefficients, and scattering phase function is an important issue for estimating water quality (WQ) components. For Case 1 waters RSR decomposition can be easily accomplished due to the small quantity of optically-active components and interrelationships of inherent optical properties (IOPs) induced by different water constituents. However, for inland and coastal waters, the situation is generally more complex because of the occurrence of high concentrations of suspended solids and weak relationships between optical properties and water components. Our research focused on an intermediate estuarine condition within the Albemarle-Pamlico Estuary System (APES), North Carolina, USA. Field radiometric observations were performed using a Satlantic hyperspectral instrument and corresponding water constituent concentrations were measured using standard laboratory procedures. RSR decomposition was performed using the ENVISAT MERIS near-infrared to red ratios for the retrieval of IOPs and various WQ components including chlorophyll, volatile (organic), and total suspended solids concentrations. Decomposition was accomplished using extended quasi-single-scattering (bidirectional reflectance) and extended Kubelka-Munk (bihemispherical reflectance) to derive exact radiative transfer solutions. Derived estimates were validated for 40 near surface radiometric and WQ sampling sites and demonstrated a high degree of correspondence. This method can be easily modified for both in situ and remote-sensing applications over broad range water conditions and locations.