Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) XCO2 Measurements With GGG2020 TCCON
Abstract The Orbiting Carbon Observatory 2 (OCO‐2) is NASA's first Earth observation satellite mission dedicated to studying the sources and sinks of carbon dioxide (CO2) on a global scale. The observations of reflected sunlight are inverted in a retrieval algorithm to produce estimates of the...
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American Geophysical Union (AGU)
2025-07-01
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| Online Access: | https://doi.org/10.1029/2024EA003935 |
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| author | Saswati Das Matthäus Kiel Joshua Laughner Gregory Osterman Christopher W. O’Dell Thomas E. Taylor Brendan Fisher Frédéric Chevallier Nicholas M. Deutscher Manvendra K. Dubey Dietrich G. Feist Omaira Garcia David W. T. Griffith Frank Hase Laura T. Iraci Rigel Kivi Isamu Morino Justus Notholt Hirofumi Ohyama David Pollard Sébastien Roche Coleen M. Roehl Constantina Rousogenous Mahesh Kumar Sha Kei Shiomi Kimberly Strong Ralf Sussmann Yao Té Geoffrey Toon Mihalis Vrekoussis Pucai Wang Thorsten Warneke Paul Wennberg Abhishek Chatterjee Vivienne H. Payne Debra Wunch |
| author_facet | Saswati Das Matthäus Kiel Joshua Laughner Gregory Osterman Christopher W. O’Dell Thomas E. Taylor Brendan Fisher Frédéric Chevallier Nicholas M. Deutscher Manvendra K. Dubey Dietrich G. Feist Omaira Garcia David W. T. Griffith Frank Hase Laura T. Iraci Rigel Kivi Isamu Morino Justus Notholt Hirofumi Ohyama David Pollard Sébastien Roche Coleen M. Roehl Constantina Rousogenous Mahesh Kumar Sha Kei Shiomi Kimberly Strong Ralf Sussmann Yao Té Geoffrey Toon Mihalis Vrekoussis Pucai Wang Thorsten Warneke Paul Wennberg Abhishek Chatterjee Vivienne H. Payne Debra Wunch |
| author_sort | Saswati Das |
| collection | DOAJ |
| description | Abstract The Orbiting Carbon Observatory 2 (OCO‐2) is NASA's first Earth observation satellite mission dedicated to studying the sources and sinks of carbon dioxide (CO2) on a global scale. The observations of reflected sunlight are inverted in a retrieval algorithm to produce estimates of the dry air mole‐fractions of CO2 (XCO2). The OCO‐2 Level 2 data release, version 11.1 (v11.1) retrievals from the Atmospheric Carbon Observations from Space (ACOS) algorithm, includes significant improvements in the XCO2 data product compared to older OCO‐2 data versions. This work compares the v11.1 XCO2 from OCO‐2 against XCO2 estimates collected from a global ground‐based network known as the Total Carbon Column Observing Network (TCCON), OCO‐2's primary validation source. The OCO‐2 project provides a version of the Level 2 data product, called “lite” files that include calibrated and bias‐corrected XCO2 values, accessible together with all OCO‐2 data products through the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). This work shows that OCO‐2 XCO2 observations made between September 2014 and December 2023, after quality filtering and the application of an averaging kernel correction, agree well with coincident TCCON data for all OCO‐2 observational modes of land (nadir, glint, target) and ocean (glint). The aggregated, bias‐corrected, and quality‐filtered absolute average bias values are less than or equal to 0.20 parts per million (ppm) globally for all OCO‐2 observation modes, where the biases do not indicate a statistically significant time dependence. The land nadir/glint mode has the lowest bias value of −0.03 ± 0.85 ppm. |
| format | Article |
| id | doaj-art-e55d8124504c4754aa3cee7f9a525bf8 |
| institution | Kabale University |
| issn | 2333-5084 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | American Geophysical Union (AGU) |
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| series | Earth and Space Science |
| spelling | doaj-art-e55d8124504c4754aa3cee7f9a525bf82025-08-20T03:35:16ZengAmerican Geophysical Union (AGU)Earth and Space Science2333-50842025-07-01127n/an/a10.1029/2024EA003935Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) XCO2 Measurements With GGG2020 TCCONSaswati Das0Matthäus Kiel1Joshua Laughner2Gregory Osterman3Christopher W. O’Dell4Thomas E. Taylor5Brendan Fisher6Frédéric Chevallier7Nicholas M. Deutscher8Manvendra K. Dubey9Dietrich G. Feist10Omaira Garcia11David W. T. Griffith12Frank Hase13Laura T. Iraci14Rigel Kivi15Isamu Morino16Justus Notholt17Hirofumi Ohyama18David Pollard19Sébastien Roche20Coleen M. Roehl21Constantina Rousogenous22Mahesh Kumar Sha23Kei Shiomi24Kimberly Strong25Ralf Sussmann26Yao Té27Geoffrey Toon28Mihalis Vrekoussis29Pucai Wang30Thorsten Warneke31Paul Wennberg32Abhishek Chatterjee33Vivienne H. Payne34Debra Wunch35Jet Propulsion Laboratory California Institute of Technology Pasadena CA USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USAColorado State University Fort Collins CO USAColorado State University Fort Collins CO USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USALaboratoire des Sciences du Climat et de l’Environnement/IPSL Université Paris‐Saclay Gif‐sur‐Yvette FranceInstitute of Environmental Physics (IUP) University of Bremen Bremen GermanyLos Alamos National Laboratory Los Alamos NM USAMax Planck Institute for Biogeochemistry Jena GermanyIzaña Atmospheric Research Center State Meteorological Agency of Spain (AEMet) Tenerife SpainUniversity of Wollongong Wollongong NSW AustraliaKarlsruhe Institute of Technology (KIT) Institute of Meteorology and Climate Research (IMK‐ASF) Karlsruhe GermanyAtmospheric Science Branch NASA Ames Research Center Moffett Field CA USAFinnish Meteorological Institute Sodankylä FinlandNational Institute for Environmental Studies (NIES) Tsukuba JapanInstitute of Environmental Physics (IUP) University of Bremen Bremen GermanyNational Institute for Environmental Studies (NIES) Tsukuba JapanNational Institute of Water and Atmospheric Research Lauder New ZealandEnvironmental Defense Fund New York NY USACalifornia Institute of Technology Pasadena CA USAClimate and Atmosphere Research Centre (CARE‐C) The Cyprus Institute Nicosia CyprusRoyal Belgian Institute for Space Aeronomy Brussels BelgiumEarth Observation Research Center (EORC) Japan Aerospace Exploration Agency (JAXA) Tsukuba JapanUniversity of Toronto Toronto ON CanadaKarlsruhe Institute of Technology (KIT) Institute of Meteorology and Climate Research (IMK‐IFU) Garmisch‐Partenkirchen GermanyCNRS Sorbonne Universités Observatoire de Paris PSL Research University Paris FranceJet Propulsion Laboratory California Institute of Technology Pasadena CA USAInstitute of Environmental Physics (IUP) University of Bremen Bremen GermanyLAGEO Chinese Academy of Sciences the Institute of Atmospheric Physics Beijing ChinaInstitute of Environmental Physics (IUP) University of Bremen Bremen GermanyCalifornia Institute of Technology Pasadena CA USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USAUniversity of Toronto Toronto ON CanadaAbstract The Orbiting Carbon Observatory 2 (OCO‐2) is NASA's first Earth observation satellite mission dedicated to studying the sources and sinks of carbon dioxide (CO2) on a global scale. The observations of reflected sunlight are inverted in a retrieval algorithm to produce estimates of the dry air mole‐fractions of CO2 (XCO2). The OCO‐2 Level 2 data release, version 11.1 (v11.1) retrievals from the Atmospheric Carbon Observations from Space (ACOS) algorithm, includes significant improvements in the XCO2 data product compared to older OCO‐2 data versions. This work compares the v11.1 XCO2 from OCO‐2 against XCO2 estimates collected from a global ground‐based network known as the Total Carbon Column Observing Network (TCCON), OCO‐2's primary validation source. The OCO‐2 project provides a version of the Level 2 data product, called “lite” files that include calibrated and bias‐corrected XCO2 values, accessible together with all OCO‐2 data products through the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). This work shows that OCO‐2 XCO2 observations made between September 2014 and December 2023, after quality filtering and the application of an averaging kernel correction, agree well with coincident TCCON data for all OCO‐2 observational modes of land (nadir, glint, target) and ocean (glint). The aggregated, bias‐corrected, and quality‐filtered absolute average bias values are less than or equal to 0.20 parts per million (ppm) globally for all OCO‐2 observation modes, where the biases do not indicate a statistically significant time dependence. The land nadir/glint mode has the lowest bias value of −0.03 ± 0.85 ppm.https://doi.org/10.1029/2024EA003935remote sensingOrbiting Carbon Observatory‐2carbon dioxideTCCONvalidationspace‐based measurements |
| spellingShingle | Saswati Das Matthäus Kiel Joshua Laughner Gregory Osterman Christopher W. O’Dell Thomas E. Taylor Brendan Fisher Frédéric Chevallier Nicholas M. Deutscher Manvendra K. Dubey Dietrich G. Feist Omaira Garcia David W. T. Griffith Frank Hase Laura T. Iraci Rigel Kivi Isamu Morino Justus Notholt Hirofumi Ohyama David Pollard Sébastien Roche Coleen M. Roehl Constantina Rousogenous Mahesh Kumar Sha Kei Shiomi Kimberly Strong Ralf Sussmann Yao Té Geoffrey Toon Mihalis Vrekoussis Pucai Wang Thorsten Warneke Paul Wennberg Abhishek Chatterjee Vivienne H. Payne Debra Wunch Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) XCO2 Measurements With GGG2020 TCCON Earth and Space Science remote sensing Orbiting Carbon Observatory‐2 carbon dioxide TCCON validation space‐based measurements |
| title | Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) XCO2 Measurements With GGG2020 TCCON |
| title_full | Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) XCO2 Measurements With GGG2020 TCCON |
| title_fullStr | Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) XCO2 Measurements With GGG2020 TCCON |
| title_full_unstemmed | Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) XCO2 Measurements With GGG2020 TCCON |
| title_short | Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) XCO2 Measurements With GGG2020 TCCON |
| title_sort | comparisons of the v11 1 orbiting carbon observatory 2 oco 2 xco2 measurements with ggg2020 tccon |
| topic | remote sensing Orbiting Carbon Observatory‐2 carbon dioxide TCCON validation space‐based measurements |
| url | https://doi.org/10.1029/2024EA003935 |
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