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| Titel |
A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion |
| VerfasserIn |
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, P. Bousquet |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 7 ; Nr. 11, no. 7 (2011-04-11), S.3375-3392 |
| Datensatznummer |
250009599
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| Publikation (Nr.) |
 copernicus.org/acp-11-3375-2011.pdf |
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| Zusammenfassung |
| 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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