Articles | Volume 6, issue 6
https://doi.org/10.5194/amt-6-1533-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/amt-6-1533-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article |
|
07 Jun 2013
Improvement of the retrieval algorithm for GOSAT SWIR XCO2 and XCH4 and their validation using TCCON data
Y. Yoshida, N. Kikuchi, I. Morino, O. Uchino, S. Oshchepkov, A. Bril, T. Saeki, N. Schutgens, G. C. Toon, D. Wunch, C. M. Roehl, P. O. Wennberg, D. W. T. Griffith, N. M. Deutscher, T. Warneke, J. Notholt, J. Robinson, V. Sherlock, B. Connor, M. Rettinger, R. Sussmann, P. Ahonen, P. Heikkinen, E. Kyrö, J. Mendonca, K. Strong, F. Hase, S. Dohe, and T. Yokota
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8568, Japan
now at: Atmosphere, Ocean, Planetary Physics sub-department, Clarendon Laboratory, Oxford University, Oxford, UK
Jet Propulsion Laboratory, California Institute for Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109-8099, USA
California Institute for Technology, Pasadena, CA, 91125-2100, USA
California Institute for Technology, Pasadena, CA, 91125-2100, USA
California Institute for Technology, Pasadena, CA, 91125-2100, USA
Centre for Atmospheric Chemistry, University of Wollongong, New South Wales 2522, Australia
Centre for Atmospheric Chemistry, University of Wollongong, New South Wales 2522, Australia
Institute of Environmental Physics, University of Bremen, 28334 Bremen, Germany
Institute of Environmental Physics, University of Bremen, 28334 Bremen, Germany
Institute of Environmental Physics, University of Bremen, 28334 Bremen, Germany
National Institute of Water and Atmospheric Research, Wellington, New Zealand
National Institute of Water and Atmospheric Research, Wellington, New Zealand
BC Consulting, Alexandra, New Zealand
IMK-IFU, Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany
IMK-IFU, Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany
Finnish Meteorological Institute, Arctic Research, Sodankylä, Finland
Finnish Meteorological Institute, Arctic Research, Sodankylä, Finland
Finnish Meteorological Institute, Arctic Research, Sodankylä, Finland
Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada
Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada
IMK-ASF, Karlsruhe Institute of Technology, Karlsruhe, Germany
IMK-ASF, Karlsruhe Institute of Technology, Karlsruhe, Germany
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
Abstract. The column-averaged dry-air mole fractions of carbon dioxide and methane (XCO2 and XCH4) have been retrieved from Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed (SWIR) observations and released as a SWIR L2 product from the National Institute for Environmental Studies (NIES). XCO2 and XCH4 retrieved using the version 01.xx retrieval algorithm showed large negative biases and standard deviations (−8.85 and 4.75 ppm for XCO2 and −20.4 and 18.9 ppb for XCH4, respectively) compared with data of the Total Carbon Column Observing Network (TCCON). Multiple reasons for these error characteristics (e.g., solar irradiance database, handling of aerosol scattering) are identified and corrected in a revised version of the retrieval algorithm (version 02.xx). The improved retrieval algorithm shows much smaller biases and standard deviations (−1.48 and 2.09 ppm for XCO2 and −5.9 and 12.6 ppb for XCH4, respectively) than the version 01.xx. Also, the number of post-screened measurements is increased, especially at northern mid- and high-latitudinal areas.
How to cite. Yoshida, Y., Kikuchi, N., Morino, I., Uchino, O., Oshchepkov, S., Bril, A., Saeki, T., Schutgens, N., Toon, G. C., Wunch, D., Roehl, C. M., Wennberg, P. O., Griffith, D. W. T., Deutscher, N. M., Warneke, T., Notholt, J., Robinson, J., Sherlock, V., Connor, B., Rettinger, M., Sussmann, R., Ahonen, P., Heikkinen, P., Kyrö, E., Mendonca, J., Strong, K., Hase, F., Dohe, S., and Yokota, T.: Improvement of the retrieval algorithm for GOSAT SWIR XCO2 and XCH4 and their validation using TCCON data, Atmos. Meas. Tech., 6, 1533–1547, https://doi.org/10.5194/amt-6-1533-2013, 2013.
Received: 19 Dec 2012 – Discussion started: 30 Jan 2013 – Revised: 23 Apr 2013 – Accepted: 03 May 2013 – Published: 07 Jun 2013