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Validation of GOSAT SWIR XCO_2 and XCH_4 Retrieved by PPDF-S Method and Comparison with Full Physics Method

Iwasaki, Chisa and Imasu, Ryoichi and Bril, Andrey and Yokota, Tatsuya and Yoshida, Yukio and Morino, Isamu and Oshchepkov, Sergey and Wunch, Debra and Griffith, David W. T. and Deutscher, Nicholas M. and Kivi, Rigel and Pollard, Dave and Roehl, Coleen M. and Velazco, Voltaire A. and Sussmann, Ralf and Warneke, Thorsten and Notholt, Justus (2017) Validation of GOSAT SWIR XCO_2 and XCH_4 Retrieved by PPDF-S Method and Comparison with Full Physics Method. SOLA, 13 . pp. 168-173. ISSN 1349-6476.

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Column-averaged concentrations of carbon dioxide (XCO_2) and methane (XCH_4) were retrieved from spectra observed by the Greenhouse gases Observing SATellite (GOSAT) using the so-called Photon path length Probability Density Function-Simultaneous (PPDF-S) retrieval method, which explains cloud/aerosol effects in terms of light path modification. The PPDF-S data, as well as the standard products for General Users (GU) of XCO_2 and XCH_4 retrieved using the full physics (FP) method, were validated through comparison with Total Carbon Column Observing Network (TCCON) data. Results show that bias and its standard deviation of XCO_2 over the land are 0.73 and 1.83 ppm for the PPDF-S data, and −0.32 and 2.16 ppm for GU products. For XCH_4, they are 1.4 and 14.1 ppb, and −1.9 and 12.5 ppb, respectively. Although the magnitude relations between XCO_2 and XCH_4 retrieved by the PPDF-S and GU products are identical over the land, they differ over the ocean. This fact emphasizes the importance of additional validation data over the ocean. Results also show that 68% of FP data that were screened out through an Aerosol Optical Thickness (AOT) test passed all screening tests for the PPDF-S method, implying the applicability of the PPDF-S method to denser aerosol conditions.

Item Type:Article
Related URLs:
URLURL TypeDescription
Yoshida, Yukio0000-0002-3515-1488
Morino, Isamu0000-0003-2720-1569
Wunch, Debra0000-0002-4924-0377
Griffith, David W. T.0000-0002-7986-1924
Deutscher, Nicholas M.0000-0002-2906-2577
Roehl, Coleen M.0000-0001-5383-8462
Velazco, Voltaire A.0000-0002-1376-438X
Warneke, Thorsten0000-0001-5185-3415
Additional Information:© 2017 the Meteorological Society of Japan. Released on J-STAGE: September 14, 2017; Received: May 19, 2017; Accepted: August 07, 2017. This study was conducted under the framework of joint research between NIES and Atmosphere and Ocean Research Institute (AORI) of The University of Tokyo. The investigation was partially supported by the Belarusian Republican Foundation for Fundamental, Research Agreement No. F15SB-023, and the Bilateral Program of the Japan Society for the Promotion of Science (JSPS). TCCON data were obtained from the TCCON Data Archive (doi:10.14291/tccon.archive/1348407), hosted by the Carbon Dioxide Information Analysis Center (CDIAC) at Oak Ridge National Laboratory, Oak Ridge, Tennessee, US. ACOS/OCO-2 absorption coefficient (ABSCO) tables were provided by the Jet Propulsion Laboratory (JPL) and were used for radiative transfer calculation. I received generous support from Sachiko Hayashida of Nara Women’s University. Nicholas Deutscher is supported by an Australian Research Council Discovery Early Career Researcher Award, DE140100178.
Funding AgencyGrant Number
Belarusian Republican Foundation for Fundamental ResearchF15SB-023
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Nara Women’s UniversityUNSPECIFIED
Australian Research CouncilDE140100178
Record Number:CaltechAUTHORS:20180530-131114151
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86718
Deposited By: Tony Diaz
Deposited On:30 May 2018 20:37
Last Modified:09 Mar 2020 13:19

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