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Retrieval of greenhouse gases from GOSAT and GOSAT-2 using the FOCAL algorithm

Noël, Stefan and Reuter, Maximilian and Buchwitz, Michael and Borchardt, Jakob and Hilker, Michael and Schneising, Oliver and Bovensmann, Heinrich and Burrows, John P. and Di Noia, Antonio and Parker, Robert J. and Suto, Hiroshi and Yoshida, Yukio and Buschmann, Matthias and Deutscher, Nicholas M. and Feist, Dietrich G. and Griffith, David W. T. and Hase, Frank and Kivi, Rigel and Liu, Cheng and Morino, Isamu and Notholt, Justus and Oh, Young-Suk and Ohyama, Hirofumi and Petri, Christof and Pollard, David F. and Rettinger, Markus and Roehl, Coleen M. and Rousogenous, Constantina and Sha, Mahesh K. and Shiomi, Kei and Strong, Kimberly and Sussmann, Ralf and Té, Yao and Velazco, Voltaire A. and Vrekoussis, Mihalis and Warneke, Thorsten (2022) Retrieval of greenhouse gases from GOSAT and GOSAT-2 using the FOCAL algorithm. Atmospheric Measurement Techniques (AMT), 15 (11), pp. 3401-3437. Copernicus Publications. doi: 10.5194/amt-15-3401-2022. ISSN 1867-1381.

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Official URL: https://doi.org/10.5194/amt-15-3401-2022


We show new results from an updated version of the Fast atmOspheric traCe gAs retrievaL (FOCAL) retrieval method applied to measurements of the Greenhouse gases Observing SATellite (GOSAT) and its successor GOSAT-2. FOCAL was originally developed for estimating the total column carbon dioxide mixing ratio (XCO2) from spectral measurements made by the Orbiting Carbon Observatory-2 (OCO-2). However, depending on the available spectral windows, FOCAL also successfully retrieves total column amounts for other atmospheric species and their uncertainties within one single retrieval. The main focus of the current paper is on methane (XCH4; full-physics and proxy product), water vapour (XH2O) and the relative ratio of semi-heavy water (HDO) to water vapour (delta-D). Due to the extended spectral range of GOSAT-2, it is also possible to derive information on carbon monoxide (XCO) and nitrous oxide (XN2O) for which we also show first results. We also present an update on XCO2 from both instruments. For XCO2, the new FOCAL retrieval (v3.0) significantly increases the number of valid data compared with the previous FOCAL retrieval version (v1) by 50 % for GOSAT and about a factor of 2 for GOSAT-2 due to relaxed pre-screening and improved post-processing. All v3.0 FOCAL data products show reasonable spatial distribution and temporal variations. Comparisons with the Total Carbon Column Observing Network (TCCON) result in station-to-station biases which are generally in line with the reported TCCON uncertainties. With this updated version of the GOSAT-2 FOCAL data, we provide a first total column average XN2O product. Global XN2O maps show a gradient from the tropics to higher latitudes on the order of 15 ppb, which can be explained by variations in tropopause height. The new GOSAT-2 XN2O product compares well with TCCON. Its station-to-station variability is lower than 2 ppb, which is about the magnitude of the typical N2O variations close to the surface. However, both GOSAT-2 and TCCON measurements show that the seasonal variations in the total column average XN2O are on the order of 8 ppb peak-to-peak, which can be easily resolved by the GOSAT-2 FOCAL data. Noting that only few XN2O measurements from satellites exist so far, the GOSAT-2 FOCAL product will be a valuable contribution in this context.

Item URL in elib:https://elib.dlr.de/191249/
Document Type:Article
Title:Retrieval of greenhouse gases from GOSAT and GOSAT-2 using the FOCAL algorithm
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Noël, StefanUniversity of Bremen, Bremen, Germanyhttps://orcid.org/0000-0002-5216-9110UNSPECIFIED
Reuter, MaximilianUniversity of Bremen, Bremen, Germanyhttps://orcid.org/0000-0001-9141-3895UNSPECIFIED
Buchwitz, MichaelUniversity of Bremen, Bremen, Germanyhttps://orcid.org/0000-0001-7616-1837UNSPECIFIED
Borchardt, JakobUniversity of Bremen, Bremen, GermanyUNSPECIFIEDUNSPECIFIED
Hilker, MichaelUniversity of Bremen, Bremen, GermanyUNSPECIFIEDUNSPECIFIED
Schneising, OliverUniversity of Bremen, Bremen, Germanyhttps://orcid.org/0000-0003-1725-8246UNSPECIFIED
Bovensmann, HeinrichUniversity of Bremen, Bremen, Germanyhttps://orcid.org/0000-0001-8882-4108UNSPECIFIED
Burrows, John P.University of Bremen, Bremen, Germanyhttps://orcid.org/0000-0003-1547-8130UNSPECIFIED
Di Noia, AntonioUniversity of Leicester, UKhttps://orcid.org/0000-0002-5052-0763UNSPECIFIED
Parker, Robert J.University of Leicester, UKhttps://orcid.org/0000-0002-0801-0831UNSPECIFIED
Yoshida, YukioNIES, Tsukuba, Japanhttps://orcid.org/0000-0002-3515-1488UNSPECIFIED
Buschmann, MatthiasUniversity of Bremen, Bremen, Germanyhttps://orcid.org/0000-0001-5077-9524UNSPECIFIED
Deutscher, Nicholas M.University of Wollongong, Wollongong, NSW, Australiahttps://orcid.org/0000-0002-2906-2577UNSPECIFIED
Feist, Dietrich G.DLR, IPA und Univ. Münchenhttps://orcid.org/0000-0002-5890-6687UNSPECIFIED
Griffith, David W. T.University of Wollongong, Wollongong, NSW, Australiahttps://orcid.org/0000-0002-7986-1924UNSPECIFIED
Kivi, RigelFMI, Sodankylä, Finlandhttps://orcid.org/0000-0001-8828-2759UNSPECIFIED
Liu, ChengUniversity of Science and Technology of China, Hefei, Chinahttps://orcid.org/0000-0002-3759-9219UNSPECIFIED
Morino, IsamuNIES, Tsukuba, Japanhttps://orcid.org/0000-0003-2720-1569UNSPECIFIED
Notholt, JustusUniversity of Bremen, Bremen, GermanyUNSPECIFIEDUNSPECIFIED
Oh, Young-SukNational Institute of Meteorological Sciences 33, Seohobuk-ro, Seogwipo-si, Jeju-do 63568, Republic of Koreahttps://orcid.org/0000-0001-8010-1597UNSPECIFIED
Ohyama, HirofumiNIES, Tsukuba, Japanhttps://orcid.org/0000-0003-2109-9874UNSPECIFIED
Petri, ChristofUniversity of Bremen, Bremen, Germanyhttps://orcid.org/0000-0002-7010-5532UNSPECIFIED
Pollard, David F.National Institute of Water and Atmospheric Research, Lauder, New Zealandhttps://orcid.org/0000-0001-9923-2984UNSPECIFIED
Rettinger, MarkusKIT, Garmisch-Partenkirchen, GermanyUNSPECIFIEDUNSPECIFIED
Roehl, Coleen M.California Institute of Technology, Pasadena, CA, USAhttps://orcid.org/0000-0001-5383-8462UNSPECIFIED
Rousogenous, ConstantinaCARE-C, The Cyprus Institute, Nicosia, Cyprushttps://orcid.org/0000-0001-9505-5239UNSPECIFIED
Sha, Mahesh K.BIRA-IASB, Brussels, Belgiumhttps://orcid.org/0000-0003-1440-1529UNSPECIFIED
Shiomi, KeiJapan Aerospace Exploration Agency, Sengen, Tsukuba, Ibaraki, Japanhttps://orcid.org/0000-0002-1206-8614UNSPECIFIED
Strong, KimberlyUniversity of Toronto, Toronto, Canadahttps://orcid.org/0000-0001-9947-1053UNSPECIFIED
Sussmann, RalfKIT, Garmisch-Partenkirchen, GermanyUNSPECIFIEDUNSPECIFIED
Té, YaoCNRS, Observatoire de Paris, PSL Université, Paris, Francehttps://orcid.org/0000-0001-6405-8074UNSPECIFIED
Velazco, Voltaire A.University of Wollongong, Wollongong, NSW, Australiahttps://orcid.org/0000-0002-1376-438XUNSPECIFIED
Vrekoussis, MihalisEnergy Environment and Water Research Center, Cyprus Institute, Nicosia, Cyprushttps://orcid.org/0000-0001-8292-8352UNSPECIFIED
Warneke, ThorstenUniversity of Bremen, Bremen, GermanyUNSPECIFIEDUNSPECIFIED
Date:9 June 2022
Journal or Publication Title:Atmospheric Measurement Techniques (AMT)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 3401-3437
Publisher:Copernicus Publications
Keywords:Satellite, remote sensing, retrieval, CO2, CH4, GOSAT, GOSAT-2, TCCON, FOCAL
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 - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Feist, Dr. Dietrich
Deposited On:30 Nov 2022 14:36
Last Modified:30 Nov 2022 14:36

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