Remote sensing of solar-stimulated phytoplankton chlorophyll fluorescence by differential absorption in the oxygen B-band

Robert Frouin; Pierre-Yves Deschamps; Philippe Dubuisson

doi:10.1117/12.806386

19 December 2008 Remote sensing of solar-stimulated phytoplankton chlorophyll fluorescence by differential absorption in the oxygen B-band

Robert Frouin, Pierre-Yves Deschamps, Philippe Dubuisson

Author Affiliations +

Proceedings Volume 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters; 715005 (2008) https://doi.org/10.1117/12.806386
Event: SPIE Asia-Pacific Remote Sensing, 2008, Noumea, New Caledonia

Abstract

A new methodology is proposed to estimate from space the solar-induced chlorophyll fluorescence of natural waters. The methodology exploits absorption in the oxygen B-band around 687 nm, located near the peak of fluorescence emission at 685 nm. Inside the oxygen absorption lines, the fluorescence signal enhances the reflected solar radiance. By using a pair of spectral bands inside and outside the absorption region, or more generally spectral bands for which oxygen absorption is sufficiently different, the emitted contribution to the measured radiance can be extracted. Feasibility is demonstrated and retrieval accuracy quantified through simulations of the top-of-atmosphere reflectance by a radiation transfer code that fully accounts for multiple scattering and interactions between scattering and absorption. The differential absorption method works well from just above the surface. Pairs of spectral bands centered on the same wavelength provide the best results. Using spectral bands of 686.8-688.3 nm and 683.1-692.0 nm, the expected accuracy on fluorescence retrievals is <10% for chlorophyll concentrations above 1 mgm-3. Performance is degraded from space, due to the influence of aerosol vertical structure on the oxygen transmittance associated with path reflectance. In this case, knowledge of aerosol reflectance and optical thickness is required, but assuming an average aerosol vertical distribution yields reasonable results. In comparison with the standard baseline technique, significant improvements in retrieval accuracy are expected in Case II waters, especially in the presence of sediments.

Citation Download Citation

Robert Frouin, Pierre-Yves Deschamps, and Philippe Dubuisson "Remote sensing of solar-stimulated phytoplankton chlorophyll fluorescence by differential absorption in the oxygen B-band", Proc. SPIE 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters, 715005 (19 December 2008); https://doi.org/10.1117/12.806386

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