Simultaneous retrieval of atmospheric CO₂ and light path modification from space-based spectroscopic observations of greenhouse gases: methodology and application to GOSAT measurements over TCCON sites

Creators: Oshchepkov, Sergey; Bril, Andrey; Yokota, Tatsuya; Yoshida, Yukio; Blumenstock, Thomas; Deutscher, Nicholas M.; Dohe, Susanne; Macatangay, Ronald; Morino, Isamu; Notholt, Justus; Rettinger, Markus; Petri, Christof; Schneider, Matthias; Sussman, Ralf; Uchino, Osamu; Velazco, Voltaire; Wunch, Debra; Belikov, Dmitry

Abstract

This paper presents an improved photon path length probability density function method that permits simultaneous retrievals of column-average greenhouse gas mole fractions and light path modifications through the atmosphere when processing high-resolution radiance spectra acquired from space. We primarily describe the methodology and retrieval setup and then apply them to the processing of spectra measured by the Greenhouse gases Observing SATellite (GOSAT). We have demonstrated substantial improvements of the data processing with simultaneous carbon dioxide and light path retrievals and reasonable agreement of the satellite-based retrievals against ground-based Fourier transform spectrometer measurements provided by the Total Carbon Column Observing Network (TCCON).

Additional Information

© 2013 Optical Society of America. Received 18 October 2012; revised 23 December 2012; accepted 25 December 2012; posted 23 January 2013 (Doc. ID 178308); published 19 February 2013. GOSAT is a joint effort of the Japan Aerospace Exploration Agency (JAXA), the NIES, and the Ministry of the Environment (MOE), Japan. TCCON data were obtained from the TCCON Data Archive, operated by the California Institute of Technology from the website at http://tccon.ipac.caltech.edu/. The authors thank TCCON partners Paul Wennberg, David Griffith, Esko Kyrö, Pauli Heikkinen, and Vanessa Sherlock for their valuable contribution to TCCON measurements used in this study. U.S. funding for TCCON is provided by NASA's Terrestrial Ecology program (grant number NNX11AG01G), the Orbiting Carbon Observatory program, the Atmospheric CO2 Observations from Space (ACOS) program, and the Department of Energy/Atmospheric Radiation Measurement (DOE/ARM) program. The Darwin TCCON site was built at Caltech with funding from the OCO project, and is operated by the University of Wollongong, with travel funds for maintenance and equipment costs funded by the OCO-2 project. We acknowledge funding to support Darwin and Wollongong from the Australian Research Council projects LE0668470, DP0879468, DP110103118, and LP0562346. Lauder TCCON measurements are funded by New Zealand Foundation of Research Science and Technology contracts C01X0204 and CO1X0406. We acknowledge financial support of the Białystok and Orléans TCCON sites from the Senate of Bremen and EU projects IMECC, GEOMON, and InGOS as well as maintenance and logistical work provided by AeroMeteo Service (Białystok) and the RAMCES team at LSCE (Gif-sur-Yvette, France) and additional operational funding from the NIES GOSAT project. The Garmisch TCCON team acknowledges funding by the EC-INGOS project. We also would like to thank the members of the NIES GOSAT and the NASA Atmospheric CO2 Observations from Space (ACOS) projects for helpful comments and discussions.

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