ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-10-28963-2010 A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion Yver C. 1 Pison I. 1 2 Fortems-Cheiney A. 1 Schmidt M. 1 Bousquet P. 1 2 Ramonet M. 1 Jordan A. 3 Søvde A. 4 Engel A. 5 Fisher R. 6 Lowry D. 6 Nisbet E. 6 Levin I. 7 Hammer S. 7 Necki J. 8 Bartyzel J. 8 Reimann S. 9 Vollmer M. K. 9 Steinbacher M. 9 Aalto T. 10 Maione M. 11 Arduini I. 11 O'Doherty S. 12 Grant A. 12 Sturges W. 13 Lunder C. R. 14 Privalov V. 15 Paramonova N. 15 Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR 8212, Gif sur Yvette, France Université de Versailles Saint Quentin en Yvelines (UVSQ), Versailles, France Max Planck Institut für Biogeochemistry, 07701 Jena, Germany Department of Geosciences, University of Oslo, P.O. Box 1022, Blindern, 0315 Oslo, Norway Institut für Meteorologie und Geophysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany Department of Geology, Royal Holloway, University of London, Egham, UK Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, 30-059 Krakow, Al. Mickiewicza 30, Poland Empa, Swiss Federal Institute for Materials Science and Technology, Laboratory for Air Pollution/Environmental Technology, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland Finnish Meteorological Institute, Climate Change Research, P.O. Box 503, 00101 Helsinki, Finland Università degli Studi di Urbino, Istituto di Scienze Chimiche, Piazza Rinascimento 6, 61029 Urbino, Italy School of Chemistry, University of Bristol, UK School of Environmental Sciences, University of East Anglia, Norwich, UK Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller, Norway Voeikov Main Geophysical Observatory, St. Petersburg, Russia 25 11 2010 10 11 28963 29005 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/10/28963/2010/acpd-10-28963-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/10/28963/2010/acpd-10-28963-2010.pdf

This paper presents an analysis of the recent tropospheric molecular hydrogen (H<sub>2</sub>) budget with a particular focus on soil uptake and surface emissions. A variational inversion scheme is combined with observations from the RAMCES and EUROHYDROS atmospheric networks, which include continuous measurements performed between mid-2006 and mid-2009. Net H<sub>2</sub> surface flux, soil uptake distinct from surface emissions and finally, soil uptake, biomass burning, anthropogenic emissions and N<sub>2</sub> fixation-related emissions separately were inverted in several scenarios. The various inversions generate an estimate for each term of the H<sub>2</sub> budget. The net H<sub>2</sub> flux per region (High Northern Hemisphere, Tropics and High Southern Hemisphere) varies between −8 and 8 Tg yr<sup>−1</sup>. The best inversion in terms of fit to the observations combines updated prior surface emissions and a soil deposition velocity map that is based on soil uptake measurements. Our estimate of global H<sub>2</sub> soil uptake is −59 ± 4.0 Tg yr<sup>−1</sup>. Forty per cent of this uptake is located in the High Northern Hemisphere and 55% is located in the Tropics. In terms of surface emissions, seasonality is mainly driven by biomass burning emissions. The inferred European anthropogenic emissions are consistent with independent H<sub>2</sub> emissions estimated using a H<sub>2</sub>/CO mass ratio of 0.034 and CO emissions considering their respective uncertainties. To constrain a more robust partition of H<sub>2</sub> sources and sinks would need additional constraints, such as isotopic measurements.

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