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THE SPATIAL DISTRIBUTION OF PHYTOPLANKTON CHLOROPHYLL CONCENTRATIONS IN NARRAGANSETT BAY USING AIRCRAFT REMOTE SENSING
Citation:
Keith, D J., J S. Latimer, AND J. A. Yoder. THE SPATIAL DISTRIBUTION OF PHYTOPLANKTON CHLOROPHYLL CONCENTRATIONS IN NARRAGANSETT BAY USING AIRCRAFT REMOTE SENSING. Presented at American Society of Limnology and Oceanography Annual Meeting, Salt Lake City, UT, February 8-14, 2003.
Description:
During the summer of 2002, phytoplankton chlorophyll concentrations were determined in Narragansett Bay, Rhode Island using a light aircraft equipped with the MicroSAS remote sensing system. From an altitude of 300 m, the three sensor system measured sea surface radiance (Lt), sky radiance (Lsky), and incident spectral irradiance (Es) at the SeaWiFS wavebands. From Lsky/Es and using reflectance factors from Mobley (1999), the diffuse radiances reflected from the sea surface (Lr) were determined. Lr was further partitioned into radiances from Rayleigh (Lray) and aerosol (Laero) scattering.Water-leaving radiances were derived using Lt, Lray, and Laero values and used to compute remotely sensed reflectances (Rrs). The Rrs values at 443, 490, and 510 nm were input into a spectral curvature algorithm to predict phytoplankton chlorophyll concentrations.
Maps from surveys conducted during July-September 2002 indicated that chlorophyll distribution was generally variable along the passages of Narragansett Bay with the highest values (> 15 ug/l) associated with the upper bay region and harbor areas. Lower values (<6 ug/l) were associated with the lower bay and offshore areas.