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A Decade of GOSAT Proxy Satellite CH4 Observations

Parker, Robert J. and Webb, Alex and Boesch, Hartmut and Somkuti, Peter and Guillo, Rocio Barrio and Di Noia, Antonio and Kalaitzi, Nikoleta and Anand, Jasdeep and Bergamaschi, Peter and Chevallier, Frederic and Palmer, Paul I. and Feng, Liang and Deutscher, Nicholas M. and Feist, Dietrich G. and Griffith, David W. T. and Hase, Frank and Kivi, Rigel and Morino, Isamu and Notholt, Justus and Oh, Young-Suk and Ohyama, Hirofumi and Petri, Christof and Pollard, David F. and Roehl, Coleen M. and Sha, Mahesh K. and Shiomi, Kei and Strong, Kimberly and Sussmann, Ralf and Té, Yao and Velazco, Voltaire A. and Warneke, Thorsten and Wennberg, Paul O. and Wunch, Debra (2020) A Decade of GOSAT Proxy Satellite CH4 Observations. Earth System Science Data, 12 (4), pp. 3383-3412. Copernicus Publications. doi: 10.5194/essd-12-3383-2020. ISSN 1866-3508.

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Official URL: https://essd.copernicus.org/articles/12/3383/2020/


This work presents the latest release (v9.0) of the University of Leicester GOSAT Proxy XCH4 dataset. Since the launch of the GOSAT satellite in 2009, these data have been produced by the UK National Centre for Earth Observation (NCEO) as part of the ESA Greenhouse Gas-Climate Change Initiative (GHG-CCI) and Copernicus Climate Change Services (C3S) projects. With now over a decade of observations, we outline the many scientific studies achieved using past versions of these data in order to highlight how this latest version may be used in the future. We describe in detail how the data are generated, providing information and statistics for the entire processing chain from the L1B spectral data through to the final quality-filtered column-averaged dry-air mole fraction (XCH4) data. We show that out of the 19.5 million observations made between April 2009 and December 2019, we determine that 7.3 million of these are sufficiently cloud-free (37.6 %) to process further and ultimately obtain 4.6 million (23.5 %) high-quality XCH 4 observations. We separate these totals by observation mode (land and ocean sun glint) and by month, to provide data users with the expected data coverage, including highlighting periods with reduced observations due to instrumental issues. We perform extensive validation of the data against the Total Carbon Column Observing Network (TCCON), comparing to ground-based observations at 22 locations worldwide. We find excellent agreement with TCCON, with an overall correlation coefficient of 0.92 for the 88 345 co-located measurements. The single-measurement precision is found to be 13.72 ppb, and an overall global bias of 9.06 ppb is determined and removed from the proxy XCH4 data. Additionally, we validate the separate components of the proxy (namely the modelled XCO2 and the XCH4/XCO2 ratio) and find these to be in excellent agreement with TCCON. In order to show the utility of the data for future studies, we compare against simulated XCH4 from the TM5 model. We find a high degree of consistency between the model and observations throughout both space and time. When focusing on specific regions, we find average differences ranging from just 3.9 to 15.4 ppb. We find the phase and magnitude of the seasonal cycle to be in excellent agreement, with an average correlation coefficient of 0.93 and a mean seasonal cycle amplitude difference across all regions of -0.84 ppb.

Item URL in elib:https://elib.dlr.de/138597/
Document Type:Article
Title:A Decade of GOSAT Proxy Satellite CH4 Observations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Parker, Robert J.University of Leicester, UKhttps://orcid.org/0000-0002-0801-0831
Webb, AlexUniversity of Leicester, UKhttps://orcid.org/0000-0002-7164-7835
Boesch, HartmutUniversity of Leicester, UKUNSPECIFIED
Somkuti, PeterColorado State University, Colorado, UShttps://orcid.org/0000-0002-5858-8471
Guillo, Rocio BarrioUniversity of Leicester, UKUNSPECIFIED
Di Noia, AntonioUniversity of Leicester, UKhttps://orcid.org/0000-0002-5052-0763
Kalaitzi, NikoletaUniversity of Leicester, UKUNSPECIFIED
Anand, JasdeepUniversity of Leicester, UKUNSPECIFIED
Bergamaschi, PeterEuropean Commission Joint Research Centre, Ispra (Va), Italyhttps://orcid.org/0000-0003-4555-1829
Chevallier, FredericLSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif Sur Yvette, Francehttps://orcid.org/0000-0002-4327-3813
Palmer, Paul I.University of Edinburgh, Edinburgh, Scotlandhttps://orcid.org/0000-0002-1487-0969
Feng, LiangUniversity of Edinburgh, Edinburgh, ScotlandUNSPECIFIED
Deutscher, Nicholas M.Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Northfields Ave., Wollongong, NSW 2522, Australiahttps://orcid.org/0000-0002-2906-2577
Feist, Dietrich G.DLR, IPA und Univ. Münchenhttps://orcid.org/0000-0002-5890-6687
Griffith, David W. T.Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Northfields Ave., Wollongong, NSW 2522, Australiahttps://orcid.org/0000-0002-7986-1924
Hase, FrankKIT-IMK, KarlsruheUNSPECIFIED
Kivi, RigelFinnish Meteorological Institute, Sodankylä, Finlandhttps://orcid.org/0000-0001-8828-2759
Morino, IsamuNational Institute for Environmental Studies (NIES), Tsukuba, Japanhttps://orcid.org/0000-0003-2720-1569
Notholt, JustusInstitute of Environmental Physics, University of Bremen, Bremen, Germanyhttps://orcid.org/0000-0002-3324-885X
Oh, Young-SukNational Institute of Meteorological Sciences 33, Seohobuk-ro, Seogwipo-si, Jeju-do 63568, Republic of Koreahttps://orcid.org/0000-0001-8010-1597
Ohyama, HirofumiNational Institute for Environmental Studies (NIES), Tsukuba, Japanhttps://orcid.org/0000-0003-2109-9874
Petri, ChristofInstitute of Environmental Physics, University of Bremen, Bremen, Germanyhttps://orcid.org/0000-0002-7010-5532
Pollard, David F.National Institute of Water and Atmospheric Research, Lauder, New Zealandhttps://orcid.org/0000-0001-9923-2984
Roehl, Coleen M.Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USAhttps://orcid.org/0000-0001-5383-8462
Sha, Mahesh K.Royal Belgian Institute for Space Aeronomy (BIRA-IASB), 1180 Brussels, Belgiumhttps://orcid.org/0000-0003-1440-1529
Shiomi, KeiJapan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki, JapanUNSPECIFIED
Strong, KimberlyDepartment of Physics, University of Toronto, Toronto, Canadahttps://orcid.org/0000-0001-9947-1053
Sussmann, RalfInstitute of Meteorology and Climate Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Garmisch-Partenkirchen, GermanyUNSPECIFIED
Té, YaoLERMA-IPSL, Sorbonne Université, CNRS, Observatoire de Paris, PSL Université, 75005, Paris, Francehttps://orcid.org/0000-0001-6405-8074
Velazco, Voltaire A.Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Northfields Ave., Wollongong, NSW 2522, Australiahttps://orcid.org/0000-0002-1376-438X
Warneke, ThorstenInstitute of Environmental Physics, University of Bremen, Bremen, GermanyUNSPECIFIED
Wennberg, Paul O.Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USAhttps://orcid.org/0000-0002-6126-3854
Wunch, DebraDepartment of Physics, University of Toronto, Toronto, Canadahttps://orcid.org/0000-0002-4924-0377
Journal or Publication Title:Earth System Science Data
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/essd-12-3383-2020
Page Range:pp. 3383-3412
Publisher:Copernicus Publications
Keywords:GOSAT, satellite observations, XCO2, XCH4, TCCON, global dataset
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - LIDAR research and development
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Lidar
Deposited By: Feist, Dr. Dietrich
Deposited On:01 Dec 2020 14:59
Last Modified:23 Jul 2022 13:45

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