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Retrieving Marine Inherent Optical Properties from Satellites Using Temperature and Salinity-dependent Backscattering by Seawater
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External Online Source: doi:10.1364/OE.21.032611
Author and Affiliation:
Werdell, Paul J.(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Franz, Bryan Alden(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Lefler, Jason Travis(JHT, Inc., Orlando, FL, United States);
Robinson, Wayne D.(Science Applications International Corp., McLean, VA, United States);
Boss, Emmanuel(Maine Univ., School of Marine Sciences, Orono, ME, United States)
Abstract: Time-series of marine inherent optical properties (IOPs) from ocean color satellite instruments provide valuable data records for studying long-term time changes in ocean ecosystems. Semi-analytical algorithms (SAAs) provide a common method for estimating IOPs from radiometric measurements of the marine light field. Most SAAs assign constant spectral values for seawater absorption and backscattering, assume spectral shape functions of the remaining constituent absorption and scattering components (e.g., phytoplankton, non-algal particles, and colored dissolved organic matter), and retrieve the magnitudes of each remaining constituent required to match the spectral distribution of measured radiances. Here, we explore the use of temperature- and salinity-dependent values for seawater backscattering in lieu of the constant spectrum currently employed by most SAAs. Our results suggest that use of temperature- and salinity-dependent seawater spectra elevate the SAA-derived particle backscattering, reduce the non-algal particles plus colored dissolved organic matter absorption, and leave the derived absorption by phytoplankton unchanged.
Publication Date: Dec 23, 2013
Document ID:
20140005674
(Acquired May 16, 2014)
Subject Category: OCEANOGRAPHY; GEOSCIENCES (GENERAL)
Report/Patent Number: GSFC-E-DAA-TN12659
Document Type: Journal Article
Publication Information: Optics Express; Volume 21; Issue 26; 32611-32622
Publisher Information: Optic Express
Contract/Grant/Task Num: NNG12HZ03C
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 12p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ABSORPTION SPECTRA; BACKSCATTERING; ECOSYSTEMS; OCEANS; OPTICAL PROPERTIES; PHYTOPLANKTON; SALINITY; SATELLITE INSTRUMENTS; SHAPE FUNCTIONS; TEMPERATURE DEPENDENCE; WATER COLOR
Other Descriptors: OCEANIC SCATTERING; PASSIVE REMOTE SENSING; BACKSCATTERING
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