A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion
This paper presents an analysis of the recent tropospheric molecular hydrogen (H2) budget with a particular focus on soil uptake and European surface emissions. A variational inversion scheme is combined with observations from the RAMCES and EUROHYDROS atmospheric networks, which include continuous...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
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11 April 2011
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| In: |
Atmospheric chemistry and physics
Year: 2011, Jahrgang: 11, Heft: 7, Pages: 3375-3392 |
| ISSN: | 1680-7324 |
| DOI: | 10.5194/acp-11-3375-2011 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.5194/acp-11-3375-2011 Verlag, lizenzpflichtig, Volltext: https://acp.copernicus.org/articles/11/3375/2011/ 
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| Verfasserangaben: | C.E. Yver, I.C. Pison, A. Fortems-Cheiney, M. Schmidt, F. Chevallier, M. Ramonet, A. Jordan, O.A. Søvde, A. Engel, R.E. Fisher, D. Lowry, E.G. Nisbet, I. Levin, S. Hammer, J. Necki, J. Bartyzel, S. Reimann, M.K. Vollmer, M. Steinbacher, T. Aalto, M. Maione, J. Arduini, S. O'Doherty, A. Grant, W.T. Sturges, G.L. Forster, C.R. Lunder, V. Privalov, N. Paramonova, A. Werner, and P. Bousquet |
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| 245 | 1 | 2 | |a A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion |c C.E. Yver, I.C. Pison, A. Fortems-Cheiney, M. Schmidt, F. Chevallier, M. Ramonet, A. Jordan, O.A. Søvde, A. Engel, R.E. Fisher, D. Lowry, E.G. Nisbet, I. Levin, S. Hammer, J. Necki, J. Bartyzel, S. Reimann, M.K. Vollmer, M. Steinbacher, T. Aalto, M. Maione, J. Arduini, S. O'Doherty, A. Grant, W.T. Sturges, G.L. Forster, C.R. Lunder, V. Privalov, N. Paramonova, A. Werner, and P. Bousquet |
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| 520 | |a This paper presents an analysis of the recent tropospheric molecular hydrogen (H2) budget with a particular focus on soil uptake and European 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, then deposition velocity and surface emissions and finally, deposition velocity, biomass burning, anthropogenic and N2 fixation-related emissions were simultaneously inverted in several scenarios. These scenarios have focused on the sensibility of the soil uptake value to different spatio-temporal distributions. The range of variations of these diverse inversion sets generate an estimate of the uncertainty 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 bottom-up and top-down estimations. Our estimate of global H2 soil uptake is −59±9 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 within the range of their respective uncertainties. Additional constraints, such as isotopic measurements would be needed to infer a more robust partition of H2 sources and sinks. | ||
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