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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 11 — Nov. 13, 2006

Bio-optical properties and ocean color algorithms for coastal waters influenced by the Mississippi River during a cold front

Eurico J. D'Sa, Richard L. Miller, and Carlos Del Castillo  »View Author Affiliations


Applied Optics, Vol. 45, Issue 28, pp. 7410-7428 (2006)
http://dx.doi.org/10.1364/AO.45.007410


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Abstract

During the passage of a cold front in March 2002, bio-optical properties examined in coastal waters impacted by the Mississippi River indicated that westward advective flows and increasing river discharge containing high concentrations of nonalgal particles contributed significantly to surface optical variability. A comparison of seasonal data from three cruises indicated spectral models of absorption and scattering to be generally consistent with other coastal environments, while their parameterization in terms of chlorophyll (Chl) a concentration showed seasonal variability. The exponential slope of the colored dissolved organic matter (CDOM) averaged 0.0161 ± 0.00054 nm 1 and nonalgal absorption averaged 0.011 nm−1 with deviations from general trends observed due to anomalous water properties. Although the phytoplankton specific absorption coefficients varied over a wide range [0.02 to 0.1 m 2 ( mg   Chl ) 1 at 443   nm ] being higher in offshore surface waters, values of phytoplankton absorption spectra at the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) wave bands were highly correlated to modeled values. Particulate scattering characteristics were similar to observations for other coastal waters, while backscattering ratios were on average lower in phytoplankton-dominated surface waters ( 0 .011 ± 0 .003 ) and higher in low Chl near-bottom waters ( 0.0191 ± 0.0045 ) . Average percent differences in remote sensing reflectance R rs derived from modeled and in-water radiometric measurements were highest in the blue wave bands ( 52 % ) and at locations with more stratified water columns. SeaWiFS estimates of Chl and CDOM absorption derived using regional empirical algorithms were highly correlated to in situ data.

© 2006 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(290.1350) Scattering : Backscattering

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: October 14, 2005
Revised Manuscript: February 19, 2006
Manuscript Accepted: April 30, 2006

Virtual Issues
Vol. 1, Iss. 11 Virtual Journal for Biomedical Optics

Citation
Eurico J. D'Sa, Richard L. Miller, and Carlos Del Castillo, "Bio-optical properties and ocean color algorithms for coastal waters influenced by the Mississippi River during a cold front," Appl. Opt. 45, 7410-7428 (2006)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-45-28-7410


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