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

Frankenberg, C. and Butz, A. and Toon, G. C. (2011) Disentangling chlorophyll fluorescence from atmospheric scattering effects in O_2 A‐band spectra of reflected sun‐light. Geophysical Research Letters, 38 (3). Art. No. L03801. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20150511-105152962

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2010GL045896DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2010GL045896/abstractPublisherArticle
ORCID:
AuthorORCID
Frankenberg, C.0000-0002-0546-5857
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.
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NASA/JPL/CaltechUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20150511-105152962
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150511-105152962
Official Citation:Frankenberg, C., A. Butz, and G. C. Toon (2011), Disentangling chlorophyll fluorescence from atmospheric scattering effects in O2 A‐band spectra of reflected sun‐light, Geophys. Res. Lett., 38, L03801, doi:10.1029/2010GL045896.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57410
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:11 May 2015 21:37
Last Modified:03 Oct 2019 08:24

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