Estimation of near-infrared water-leaving reflectance for satellite ocean color data processing.
The atmospheric correction algorithm employed by the NASA Ocean Biology Processing Group requires an assumption of negligible water-leaving reflectance in the near-infrared region of the spectrum. For waters where this assumption is not valid, an optical model is used to estimate near-infrared water-leaving reflectance. We describe this optical model as implemented for the sixth reprocessing of the SeaWiFS mission-long time-series (September 2009). Application of the optical model resulted in significant reductions in the number of negative water-leaving reflectance retrievals in turbid and optically complex waters, and improved agreement with in situ chlorophyll-a observations. The incidence of negative water-leaving reflectance retrievals at 412 nm was reduced by 40%, while negative reflectance at 490 nm was nearly eliminated.
Bailey
Sean W
SW
Futuretech Corporation, 7307 Hanover Parkway, Suite D, Greenbelt, Maryland 20770, USA.
Franz
Bryan A
BA
Werdell
P Jeremy
PJ
D000465:Algorithms; D001272:Atmosphere; D002734:Chlorophyll / Q000737:chemistry*; D000077194:Chlorophyll A; D004784:Environmental Monitoring / Q000379:methods; D005843:Geography; D009792:Oceans and Seas; D055095:Optics and Photonics; D012542:Scattering, Radiation; D012623:Seawater; D013055:Spectrophotometry, Infrared / Q000379:methods*
D002734:Chlorophyll; D000077194:Chlorophyll A