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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 18
Atmos. Chem. Phys., 15, 10509-10527, 2015
https://doi.org/10.5194/acp-15-10509-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 15, 10509-10527, 2015
https://doi.org/10.5194/acp-15-10509-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 24 Sep 2015

Research article | 24 Sep 2015

Acetylene (C2H2) and hydrogen cyanide (HCN) from IASI satellite observations: global distributions, validation, and comparison with model

V. Duflot1,2, C. Wespes1, L. Clarisse1, D. Hurtmans1, Y. Ngadi1, N. Jones3, C. Paton-Walsh3, J. Hadji-Lazaro4, C. Vigouroux5, M. De Mazière5, J.-M. Metzger6, E. Mahieu7, C. Servais7, F. Hase8, M. Schneider8, C. Clerbaux1,4, and P.-F. Coheur1 V. Duflot et al.
  • 1Spectroscopie de l'Atmosphère, Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles (U.L.B.), 50 Av. F. D. Roosevelt, 1050, Brussels, Belgium
  • 2Laboratoire de l'Atmosphère et des Cyclones (LACy), Université de la Réunion, UMR CNRS-Météo-France 8105, Saint-Denis de la Réunion, France
  • 3School of Chemistry, University of Wollongong, Wollongong, New South Wales, Australia
  • 4UPMC Université Paris 06, Université Versailles-St. Quentin, CNRS/INSU, LATMOS-IPSL, Paris, France
  • 5Belgian Institute for Space Aeronomy (BIRA-IASB), 3, Av. Circulaire, 1180, Brussels, Belgium
  • 6UMS3365 de l'OSU-Réunion, CNRS – Université de la Réunion, Saint Denis de la Réunion, France
  • 7Institut d'Astrophysique et de Géophysique, Université de Liège, 17, Allée du 6 Août, B-4000, Liège, Belgium
  • 8Institute for Meteorology and Climate Research (IMK-ASF), Karlsruhe Institute of Technology, Karlsruhe, Germany

Abstract. We present global distributions of C2H2 and hydrogen cyanide (HCN) total columns derived from the Infrared Atmospheric Sounding Interferometer (IASI) for the years 2008–2010. These distributions are obtained with a fast method allowing to retrieve C2H2 abundance globally with a 5 % precision and HCN abundance in the tropical (subtropical) belt with a 10 % (25 %) precision. IASI data are compared for validation purposes with ground-based Fourier transform infrared (FTIR) spectrometer measurements at four selected stations. We show that there is an overall agreement between the ground-based and space measurements with correlation coefficients for daily mean measurements ranging from 0.28 to 0.81, depending on the site. Global C2H2 and subtropical HCN abundances retrieved from IASI spectra show the expected seasonality linked to variations in the anthropogenic emissions and seasonal biomass burning activity, as well as exceptional events, and are in good agreement with previous spaceborne studies. Total columns simulated by the Model for Ozone and Related Chemical Tracers, version 4 (MOZART-4) are compared to the ground-based FTIR measurements at the four selected stations. The model is able to capture the seasonality in the two species in most of the cases, with correlation coefficients for daily mean measurements ranging from 0.50 to 0.86, depending on the site. IASI measurements are also compared to the distributions from MOZART-4. Seasonal cycles observed from satellite data are reasonably well reproduced by the model with correlation coefficients ranging from −0.31 to 0.93 for C2H2 daily means, and from 0.09 to 0.86 for HCN daily means, depending on the considered region. However, the anthropogenic (biomass burning) emissions used in the model seem to be overestimated (underestimated), and a negative global mean bias of 1 % (16 %) of the model relative to the satellite observations was found for C2H2 (HCN).

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We present global distributions of acetylene (C2H2) and hydrogen cyanide (HCN) total columns derived from the Infrared Atmospheric Sounding Interferometer (IASI). C2H2 and HCN are ubiquitous atmospheric trace gases with medium tropospheric lifetime, which are frequently used as indicators of combustion sources and as tracers for atmospheric transport and chemistry. We show that there is an overall agreement between ground-based and space measurements, as well as model simulations.
We present global distributions of acetylene (C2H2) and hydrogen cyanide (HCN) total columns...
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