Atmos. Chem. Phys. Discuss., 10, 28963-29005, 2010
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion
C. Yver1, I. Pison1,2, A. Fortems-Cheiney1, M. Schmidt1, P. Bousquet1,2, M. Ramonet1, A. Jordan3, A. Søvde4, A. Engel5, R. Fisher6, D. Lowry6, E. Nisbet6, I. Levin7, S. Hammer7, J. Necki8, J. Bartyzel8, S. Reimann9, M. K. Vollmer9, M. Steinbacher9, T. Aalto10, M. Maione11, I. Arduini11, S. O'Doherty12, A. Grant12, W. Sturges13, C. R. Lunder14, V. Privalov15, and N. Paramonova15
1Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR 8212, Gif sur Yvette, France
2Université de Versailles Saint Quentin en Yvelines (UVSQ), Versailles, France
3Max Planck Institut für Biogeochemistry, 07701 Jena, Germany
4Department of Geosciences, University of Oslo, P.O. Box 1022, Blindern, 0315 Oslo, Norway
5Institut für Meteorologie und Geophysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
6Department of Geology, Royal Holloway, University of London, Egham, UK
7Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany
8Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, 30-059 Krakow, Al. Mickiewicza 30, Poland
9Empa, Swiss Federal Institute for Materials Science and Technology, Laboratory for Air Pollution/Environmental Technology, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland
10Finnish Meteorological Institute, Climate Change Research, P.O. Box 503, 00101 Helsinki, Finland
11Università degli Studi di Urbino, Istituto di Scienze Chimiche, Piazza Rinascimento 6, 61029 Urbino, Italy
12School of Chemistry, University of Bristol, UK
13School of Environmental Sciences, University of East Anglia, Norwich, UK
14Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller, Norway
15Voeikov Main Geophysical Observatory, St. Petersburg, Russia

Abstract. This paper presents an analysis of the recent tropospheric molecular hydrogen (H2) 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 H2 surface flux, soil uptake distinct from surface emissions and finally, soil uptake, biomass burning, anthropogenic emissions and N2 fixation-related emissions separately were inverted in several scenarios. The various inversions generate an estimate for each term of the H2 budget. The net H2 flux per region (High Northern Hemisphere, Tropics and High Southern Hemisphere) varies between −8 and 8 Tg yr−1. 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 H2 soil uptake is −59 ± 4.0 Tg yr−1. 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 H2 emissions estimated using a H2/CO mass ratio of 0.034 and CO emissions considering their respective uncertainties. To constrain a more robust partition of H2 sources and sinks would need additional constraints, such as isotopic measurements.

Citation: Yver, C., Pison, I., Fortems-Cheiney, A., Schmidt, M., Bousquet, P., Ramonet, M., Jordan, A., Søvde, A., Engel, A., Fisher, R., Lowry, D., Nisbet, E., Levin, I., Hammer, S., Necki, J., Bartyzel, J., Reimann, S., Vollmer, M. K., Steinbacher, M., Aalto, T., Maione, M., Arduini, I., O'Doherty, S., Grant, A., Sturges, W., Lunder, C. R., Privalov, V., and Paramonova, N.: A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion, Atmos. Chem. Phys. Discuss., 10, 28963-29005, doi:10.5194/acpd-10-28963-2010, 2010.
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