Open AccessFluorescence component in the reflectance spectra from coastal waters. Dependence on water composition
Author(s) -
Alex Gilerson,
Jing Zhou,
S. Hlaing,
Ioannis Ioannou,
John F. Schalles,
Barry Gross,
Fred Moshary,
Sam Ahmed
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.015702
Subject(s) - colored dissolved organic matter , radiance , environmental science , attenuation , fluorescence , chlorophyll a , attenuation coefficient , spectral line , remote sensing , phytoplankton , reflectivity , quantum yield , optics , materials science , geology , chemistry , physics , nutrient , biochemistry , organic chemistry , astronomy
Based on HYDROLIGHT simulations of more than 2000 reflectance spectra from datasets typical of coastal waters with highly variable optically active constituents as well as on intercomparisons with field measurements, the magnitude of chlorophyll fluorescence was analyzed and parameterized as a function of phytoplankton, CDOM, and suspended inorganic matter concentrations. Using the parameterizations developed, we show that variations in the fluorescence component of water leaving radiance in coastal waters are due more to the variability of attenuation in the water than to the variability of the fluorescence quantum yield, which we estimate to be relatively stable at around 1%. Finally, the ranges of water conditions where fluorescence plays a significant role in the reflectance NIR peak and where it is effectively undetectable are also determined.