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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 31 — Nov. 1, 2007
  • pp: 7720–7729

Potential impacts of nonalgal materials on water-leaving Sun induced chlorophyll fluorescence signals in coastal waters

David McKee, Alex Cunningham, David Wright, and Lorraine Hay  »View Author Affiliations


Applied Optics, Vol. 46, Issue 31, pp. 7720-7729 (2007)
http://dx.doi.org/10.1364/AO.46.007720


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Abstract

It has been suggested that Sun induced chlorophyll fluorescence (SICF) signals could be used to estimate phytoplankton chlorophyll concentration and to investigate algal physiology from space. However, water-leaving SICF is also a product of the ambient light field. In coastal waters both algal and nonalgal materials affect the underwater light field. In this study we examine the independent impacts of varying loads of mineral suspended solids (MSS) and colored dissolved organic materials (CDOM) on water-leaving SICF signals using Hydrolight radiative transfer simulations. We show that SICF signals in coastal waters are strongly influenced by nonalgal materials. Increasing concentrations of CDOM and minerals can reduce the water-leaving SICF per unit chlorophyll by over 50% for the concentration ranges explored here (CDOM = 0 to 1 m 1 at 440 nm , MSS = 0 to 10   g   m 3 ). The moderate-resolution imaging spectroradiometer (MODIS) fluorescence line height algorithm is shown to be relatively unaffected by increasing CDOM, but performance is significantly degraded by mineral concentrations greater than 5   g   m 3 owing to increased background radiance levels. The combination of these two effects means that caution is required for the interpretation of SICF signals from coastal waters.

© 2007 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(260.2510) Physical optics : Fluorescence
(280.0280) Remote sensing and sensors : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: June 27, 2007
Revised Manuscript: September 7, 2007
Manuscript Accepted: September 10, 2007
Published: October 25, 2007

Virtual Issues
Vol. 2, Iss. 12 Virtual Journal for Biomedical Optics

Citation
David McKee, Alex Cunningham, David Wright, and Lorraine Hay, "Potential impacts of nonalgal materials on water-leaving Sun induced chlorophyll fluorescence signals in coastal waters," Appl. Opt. 46, 7720-7729 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-31-7720


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