Comment on amt-2021-36
Abstract
Abstract. The Sentinel-5 Precursor (S5P) mission with the TROPOspheric Monitoring Instrument (TROPOMI) on board has been measuring solar radiation backscattered by the Earth's atmosphere and surface since its launch on 13 October 2017. In this paper, we present for the first time the S5P operational methane (CH4) and carbon monoxide (CO) products' validation results covering a period of about 3 years using global Total Carbon Column Observing Network (TCCON) and Infrared Working Group of the Network for the Detection of Atmospheric Composition Change (NDACC-IRWG) network data, accounting for a priori alignment and smoothing uncertainties in the validation, and testing the sensitivity of validation results towards the application of advanced co-location criteria. We found that the S5P standard and bias-corrected CH4 data over land surface for the recommended quality filtering fulfil the mission requirements. The systematic difference of the bias-corrected total column-averaged dry air mole fraction of methane (XCH4) data with respect to TCCON data is -0.26±0.56 % in comparison to -0.68±0.74 % for the standard XCH4 data, with a correlation of 0.6 for most stations. The bias shows a seasonal dependence. We found that the S5P CO data over all surfaces for the recommended quality filtering generally fulfil the missions requirements, with a few exceptions, which are mostly due to co-location mismatches and limited availability of data. The systematic difference between the S5P total column-averaged dry air mole fraction of carbon monoxide (XCO) and the TCCON data is on average 9.22±3.45 % (standard TCCON XCO) and 2.45±3.38 % (unscaled TCCON XCO). We found that the systematic difference between the S5P CO column and NDACC CO column (excluding two outlier stations) is on average 6.5±3.54 %. We found a correlation of above 0.9 for most TCCON and NDACC stations. The study shows the high quality of S5P CH4 and CO data by validating the products against reference global TCCON and NDACC stations covering a wide range of latitudinal bands, atmospheric conditions and surface conditions.
Authors 55
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Royal Belgian Institute for Space Aeronomy
Affiliation as printed
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
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Royal Belgian Institute for Space Aeronomy
Affiliation as printed
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology, IMK-ASF, Karlsruhe, Germany
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Space Research Organisation Netherlands
Affiliation as printed
SRON Netherlands Institute for Space Research, Utrecht, the Netherlands
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Affiliation as printed
Institute of Environmental Physics, University of Bremen, Bremen, Germany
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European Space Research Institute
Affiliation as printed
European Space Agency, ESA/ESRIN, Frascati, Italy
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Affiliation as printed
Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, Australia
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Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) · Max Planck Institute for Biogeochemistry · Ludwig-Maximilians-Universität München
Affiliation as printed
Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
Ludwig-Maximilians-Universität München, Lehrstuhl für Physik der Atmosphäre, Munich, Germany
Max Planck Institute for Biogeochemistry, Jena, Germany
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Universidad Nacional Autónoma de México
Affiliation as printed
Centro de Ciencias de la Atmósfera, Universidad Nacional Autonoma de Mexico, UNAM, Mexico City, Mexico
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NSF National Center for Atmospheric Research
Affiliation as printed
National Center for Atmospheric Research, Boulder, CO, USA
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology, IMK-ASF, Karlsruhe, Germany
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Finnish Meteorological Institute
Affiliation as printed
Finnish Meteorological Institute, FMI, Sodankylä, Finland
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Royal Belgian Institute for Space Aeronomy
Affiliation as printed
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
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Affiliation as printed
NASA Ames Research Center, Moffett Field, CA, USA
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Centre National de la Recherche Scientifique · Université Paris Sciences et Lettres · Observatoire de Paris · Sorbonne Université · Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères
Affiliation as printed
LERMA-IPSL, Sorbonne Université, CNRS, Observatoire de Paris, PSL Université, Paris, France
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Affiliation as printed
Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, Australia
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Finnish Meteorological Institute
Affiliation as printed
Finnish Meteorological Institute, FMI, Sodankylä, Finland
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Royal Belgian Institute for Space Aeronomy
Affiliation as printed
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
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Space Research Organisation Netherlands
Affiliation as printed
SRON Netherlands Institute for Space Research, Utrecht, the Netherlands
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Space Research Organisation Netherlands
Affiliation as printed
SRON Netherlands Institute for Space Research, Utrecht, the Netherlands
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Affiliation as printed
Institut d'Astrophysique et de Géophysique, Université de Liège, Liège, Belgium
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Affiliation as printed
Department of Atmospheric Physics, Faculty of Physics, St. Petersburg State University, Saint Petersburg, Russia
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Chalmers University of Technology
Affiliation as printed
Earth and Space Sciences, Chalmers University of Technology, Gothenburg, Sweden
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University of Reunion Island · Observatoire des Sciences de l'Univers de la Réunion
Affiliation as printed
UAR 3365 – OSU Réunion, Université de La Réunion, Saint-Denis, Réunion, France
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National Institute for Environmental Studies
Affiliation as printed
National Institute for Environmental Studies (NIES), Tsukuba, Japan
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Affiliation as printed
Institute for Space-Earth Environmental Research (ISEE), Nagoya University, Nagoya, Japan
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Affiliation as printed
Institute of Environmental Physics, University of Bremen, Bremen, Germany
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National Institute for Environmental Studies
Affiliation as printed
National Institute for Environmental Studies (NIES), Tsukuba, Japan
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NSF National Center for Atmospheric Research
Affiliation as printed
National Center for Atmospheric Research, Boulder, CO, USA
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Affiliation as printed
Institute of Environmental Physics, University of Bremen, Bremen, Germany
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Affiliation as printed
Institute of Environmental Physics, University of Bremen, Bremen, Germany
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National Institute of Water and Atmospheric Research
Affiliation as printed
National Institute of Water and Atmospheric Research Ltd (NIWA), Lauder, New Zealand
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology, IMK-IFU, Garmisch-Partenkirchen, Germany
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National Institute of Water and Atmospheric Research
Affiliation as printed
National Institute of Water and Atmospheric Research Ltd (NIWA), Lauder, New Zealand
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California Institute of Technology
Affiliation as printed
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology, IMK-ASF, Karlsruhe, Germany
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Affiliation as printed
Climate and Atmosphere Research Center (CARE-C), the Cyprus Institute, Nicosia, Cyprus
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology, IMK-ASF, Karlsruhe, Germany
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Japan Aerospace Exploration Agency
Affiliation as printed
Earth Observation Research Center (EORC), Japan Aerospace Exploration Agency (JAXA), Tsukuba, Japan
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National Institute of Water and Atmospheric Research
Affiliation as printed
National Institute of Water and Atmospheric Research Ltd (NIWA), Lauder, New Zealand
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Universidad Nacional Autónoma de México
Affiliation as printed
Centro de Ciencias de la Atmósfera, Universidad Nacional Autonoma de Mexico, UNAM, Mexico City, Mexico
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Affiliation as printed
Department of Physics, University of Toronto, Toronto, Ontario, Canada
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology, IMK-IFU, Garmisch-Partenkirchen, Germany
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Centre National de la Recherche Scientifique · Université Paris Sciences et Lettres · Observatoire de Paris · Sorbonne Université · Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères
Affiliation as printed
LERMA-IPSL, Sorbonne Université, CNRS, Observatoire de Paris, PSL Université, Paris, France
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National Institute for Environmental Studies
Affiliation as printed
National Institute for Environmental Studies (NIES), Tsukuba, Japan
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Affiliation as printed
Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, Australia
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Royal Belgian Institute for Space Aeronomy
Affiliation as printed
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
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Cyprus Institute · University of Bremen
Affiliation as printed
Climate and Atmosphere Research Center (CARE-C), the Cyprus Institute, Nicosia, Cyprus
Institute of Environmental Physics, University of Bremen, Bremen, Germany
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Chinese Academy of Sciences · Institute of Atmospheric Physics · University of Chinese Academy of Sciences
Affiliation as printed
LAGEO, the Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
University of Chinese Academy of Sciences, Beijing, China
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Affiliation as printed
Institute of Environmental Physics, University of Bremen, Bremen, Germany
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Affiliation as printed
Department of Physics, University of Toronto, Toronto, Ontario, Canada
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Affiliation as printed
Department of Physics, University of Toronto, Toronto, Ontario, Canada
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Affiliation as printed
Department of Physics, University of Toronto, Toronto, Ontario, Canada
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Chinese Academy of Sciences · Royal Belgian Institute for Space Aeronomy · Institute of Atmospheric Physics · Shanghai Ecological Forecasting and Remote Sensing Center
Affiliation as printed
LAGEO, the Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
Shanghai Ecological Forecasting and Remote Sensing Center, Shanghai, China
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Royal Belgian Institute for Space Aeronomy
Affiliation as printed
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
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