A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion

Yver, C, Pison, I, Fortems-Cheiney, A, Schmidt, M, Bousquet, P, Ramonet, M, Jordan, A, Sovde, A, Engel, A, Fisher, R, Lowry, D, Nisbet, E, Levin, I, Hammer, S, Necki, J, Bartyzel, J, Reimann, S, Vollmer, MK, Steinbacher, M, Aalto, T, Maione, M, Arduini, I, O'Doherty, S, Grant, A, Sturges, W, Lunder, CR, Privalov, V and Paramonova, N (2010) A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion. Atmospheric Chemistry and Physics Discussions, 10 (11). pp. 28963-29005. ISSN 1680-7375

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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 H 2 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 H 2 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.

Item Type: Article
Additional Information: © Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: Rosie Cullington
Date Deposited: 17 Feb 2011 11:54
Last Modified: 17 Sep 2020 23:33
URI: https://ueaeprints.uea.ac.uk/id/eprint/20464
DOI: 10.5194/acpd-10-28963-2010

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