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Published February 1, 2011 | Published + Supplemental Material
Journal Article Open

Disentangling chlorophyll fluorescence from atmospheric scattering effects in O_2 A‐band spectra of reflected sun‐light

Abstract

Global retrieval of solar induced fluorescence emitted by terrestrial vegetation can provide an unprecedented measure for photosynthetic efficiency. The GOSAT (JAXA, launched Feb. 2009) and OCO-2 (NASA, to be launched 2013) satellites record high-resolution spectra in the O_2 A-band region, overlapping part of the chlorophyll fluorescence spectrum. We show that fluorescence cannot be unambiguously discriminated from atmospheric scattering effects using O_2 absorption lines. This can cause systematic biases in retrieved scattering parameters (aerosol optical thickness, aerosol height, surface pressure, surface albedo) if fluorescence is neglected. Hence, we demonstrate an efficient alternative fluorescence least-squares retrieval method based solely on strong Fraunhofer lines in the vicinity of the O_2 A-band, disentangling fluorescence from scattering effects. Not only does the Fraunhofer line fit produce a more accurate estimate of fluorescence emission, but it also allows improved retrievals of atmospheric aerosols from the O_2 A-band.

Additional Information

© 2011 American Geophysical Union. Received 18 October 2010; revised 24 November 2010; accepted 13 December 2010; published 1 February 2011. We thank O. Hasekamp and J. Landgraf from the SRON‐Netherlands Institute for Space Research for kindly providing their radiative transfer code used in this study. The research described in this paper was carried out by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

Attached Files

Published - Frankenberg_et_al-2011-L03801.pdf

Supplemental Material - grl27694-sup-0001-readme.txt

Supplemental Material - grl27694-sup-0002-txts01.pdf

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