Abstract
Nitrous oxide (N2 O) is the third most abundant anthropogenous greenhouse gas (after carbon dioxide and methane), with a long atmospheric lifetime and a continuously increasing concentration due to human activities, making it an important gas to monitor. In this work, we present a new method to retrieve N2 O concentration profiles (with up to two degrees of freedom) from each cloud-free satellite observation by the Infrared Atmospheric Sounding Interferometer (IASI), using spectral micro-windows in the N2 O ν3 band, the Radiative Transfer for TOVS (RTTOV) tools and the Tikhonov regularization scheme. A time series of ten years (2011–2020) of IASI N2 O profiles and integrated partial columns has been produced and validated with collocated ground-based Network for the Detection of Atmospheric Composition Change (NDACC) and Total Carbon Column Observing Network (TCCON) data. The importance of consistency in the ancillary data used for the retrieval for generating consistent time series has been demonstrated. The Nitrous Oxide Profiling from Infrared Radiances (NOPIR) N2 O partial columns are of very good quality, with a positive bias of 1.8 to 4% with respect to the ground-based data, which is less than the sum of uncertainties of the compared values. At high latitudes, the comparisons are a bit worse, due to either a known bias in the ground-based data, or to a higher uncertainty in both ground-based and satellite retrievals.
Original language | English (US) |
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Article number | 1810 |
Journal | Remote Sensing |
Volume | 14 |
Issue number | 8 |
DOIs | |
State | Published - Apr 1 2022 |
Bibliographical note
Funding Information:Funding: This research and the APC were funded by the Belgian Science Policy (belspo)/European Space Agency (ESA) PROgramme for the Development of scientific EXperiments (PRODEX) Hy-perspectral atmospheric IR Sounding mission (HIRS) project, grant number 400013459. K.C.W. and D.B.M. acknowledge support from the US National Oceanic and Atmospheric Administration (grant no. NA13OAR4310086). The Ascension Island TCCON station has been supported by the European Space Agency (ESA) under grant 4000120088/17/I-EF and by the German Bundesministerium f´’ur Wirtschaft und Energie (BMWi) under grants 50EE1711C and 50EE1711E. We thank the ESA Ariane Tracking Station at North East Bay, Ascension Island, for hosting and local support. The NDACC site at Rikubetsu is operated as parts of the joint research programme of the Institute for Space-Earth Environmental Research (ISEE), Nagoya University, and supported in part by the GOSAT series project. TCCON sites at Tsukuba, Rikubetsu and Burgos are supported in part by the GOSAT series project. Burgos is supported in part by the Energy Development Corp. Philippines. Measurements at Lauder and Arrival Heights are core funded by NIWA through New Zealand’s Ministry of Business, Innovation and Employment Strategic Science Investment Fund. D.S. thanks Antarctica New Zealand for providing support for the measurements at Arrival Heights. The Paris TCCON site has received funding from Sorbonne Université, the French research center CNRS, the French space agency CNES, and Région Île-de-France. The University of Liège (ULiège) team has been primarily supported by the Fonds de la Recherche Scientifique (F.R.S.—FNRS, Brussels, Belgium), the Federation Wallonie-Bruxelles (FWB, Belgium) and by the GAW-CH program of MeteoSwiss (Zürich, Switzerland). C.S. thanks the International Foundation High Altitude Research Stations Jungfraujoch and Gornergrat (HFSJG, Bern) for supporting the facilities needed to perform the FTIR observations at Jungfraujoch. The TCCON and NDACC sites at Réunion Island is operated by the Royal Belgian Institute for Space Aeronomy and local activities supported by LACy/UMR8105 and by OSU-R/UMS3365—Université de La Réunion. The TCCON Réunion Island site is financially supported since 2014 by the EU project ICOS-Inwire and the ministerial decree for ICOS (FR/35/IC1 to FR/35/IC6). The National Center for Atmospheric Research is sponsored by the National Science Foundation. The NCAR FTS observation programs at Thule, GR, Boulder, CO and Mauna Loa, HI are supported under contract by the National Aeronautics and Space Administration (NASA). The Thule work is also supported by the NSF Office of Polar Programs (OPP). We wish to thank the Danish Meteorological Institute for support at the Thule site and NOAA for support at the MLO site. The TCCON Nicosia site has received additional support from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 856612 (EMME-CARE) and the Cyprus Government, and by the University of Bremen. The Eureka TCCON and NDACC measurements were made at the Polar Environment Atmospheric Research Laboratory by the Canadian Network for the Detection of Atmospheric Change, primarily supported by the Natural Sciences and Engineering Research Council of Canada, Environment and Climate Change Canada, and the Canadian Space Agency. The Izaña NDACC and TCCON station has been supported by the German Bundesministerium für Wirtschaft und Energie (BMWi) via DLRunder grants 50EE1711A and by the Helmholtz Association via the research programme ATMO, and by AEMet. NMD is supported by an Australian Research Council (ARC) Future Fellowship, FT180100327. The Darwin and Wollongong TCCON/NDACC sites have been supported by a series
Funding Information:
This research and the APC were funded by the Belgian Science Policy (belspo)/European Space Agency (ESA) PROgramme for the Development of scientific EXperiments (PRODEX) Hy-perspectral atmospheric IR Sounding mission (HIRS) project, grant number 400013459. K.C.W. and D.B.M. acknowledge support from the US National Oceanic and Atmospheric Administration (grant no. NA13OAR4310086). The Ascension Island TCCON station has been supported by the European Space Agency (ESA) under grant 4000120088/17/I-EF and by the German Bundesministerium f??ur Wirtschaft und Energie (BMWi) under grants 50EE1711C and 50EE1711E. We thank the ESA Ariane Tracking Station at North East Bay, Ascension Island, for hosting and local support. The NDACC site at Rikubetsu is operated as parts of the joint research programme of the Institute for Space-Earth Environmental Research (ISEE), Nagoya University, and supported in part by the GOSAT series project. TCCON sites at Tsukuba, Rikubetsu and Burgos are supported in part by the GOSAT series project. Burgos is supported in part by the Energy Development Corp. Philippines. Measurements at Lauder and Arrival Heights are core funded by NIWA through New Zealand?s Ministry of Business, Innovation and Employment Strategic Science Investment Fund. D.S. thanks Antarctica New Zealand for providing support for the measurements at Arrival Heights. The Paris TCCON site has received funding from Sorbonne Universit?, the French research center CNRS, the French space agency CNES, and R?gion ?le-de-France. The University of Li?ge (ULi?ge) team has been primarily supported by the Fonds de la Recherche Scientifique (F.R.S.?FNRS, Brussels, Belgium), the Federation Wallonie-Bruxelles (FWB, Belgium) and by the GAW-CH program of MeteoSwiss (Z?rich, Switzerland). C.S. thanks the International Foundation High Altitude Research Stations Jungfraujoch and Gornergrat (HFSJG, Bern) for supporting the facilities needed to perform the FTIR observations at Jungfraujoch. The TCCON and NDACC sites at R?union Island is operated by the Royal Belgian Institute for Space Aeronomy and local activities supported by LACy/UMR8105 and by OSU-R/UMS3365?Universit? de La R?union. The TCCON R?union Island site is financially supported since 2014 by the EU project ICOS-Inwire and the ministerial decree for ICOS (FR/35/IC1 to FR/35/IC6). The National Center for Atmospheric Research is sponsored by the National Science Foundation. The NCAR FTS observation programs at Thule, GR, Boulder, CO and Mauna Loa, HI are supported under contract by the National Aeronautics and Space Administration (NASA). The Thule work is also supported by the NSF Office of Polar Programs (OPP). We wish to thank the Danish Meteorological Institute for support at the Thule site and NOAA for support at the MLO site. The TCCON Nicosia site has received additional support from the European Union?s Horizon 2020 research and innovation programme under grant agreement No. 856612 (EMME-CARE) and the Cyprus Government, and by the University of Bremen. The Eureka TCCON and NDACC measurements were made at the Polar Environment Atmospheric Research Laboratory by the Canadian Network for the Detection of Atmospheric Change, primarily supported by the Natural Sciences and Engineering Research Council of Canada, Environment and Climate Change Canada, and the Canadian Space Agency. The Iza?a NDACC and TCCON station has been supported by the German Bundesministerium f?r Wirtschaft und Energie (BMWi) via DLRunder grants 50EE1711A and by the Helmholtz Association via the research programme ATMO, and by AEMet. NMD is supported by an Australian Research Council (ARC) Future Fellowship, FT180100327. The Darwin and Wollongong TCCON/NDACC sites have been supported by a series of ARC grants, including DP160100598, DP140100552, DP110103118, DP0879468 and LE0668470, and NASA grants NAG5-12247 and NNG05-GD07G.
Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords
- IASI
- greenhouse gas
- nitrous oxide
- retrieval
- validation