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Media type:
E-Article
Title:
Isotopic composition of H2from wood burning: Dependency on combustion efficiency, moisture content, andδD of local precipitation
Contributor:
Röckmann, Thomas;
Gómez Álvarez, Catalina X.;
Walter, Sylvia;
van der Veen, Carina;
Wollny, Adam G.;
Gunthe, Sachin S.;
Helas, Günther;
Pöschl, Ulrich;
Keppler, Frank;
Greule, Markus;
Brand, Willi A.
imprint:
American Geophysical Union (AGU), 2010
Published in:Journal of Geophysical Research: Atmospheres
Language:
English
DOI:
10.1029/2009jd013188
ISSN:
0148-0227
Origination:
Footnote:
Description:
<jats:p>Differences in isotopic composition between the various sources of H<jats:sub>2</jats:sub>are large, but only a few measurements have been carried out to constrain them. Two conflicting values have been published for H<jats:sub>2</jats:sub>from biomass burning. Both rely on the assumption that the isotopic composition of H<jats:sub>2</jats:sub>should scale with the isotopic composition of the precipitation at the location where the biomass grew. Here we test this hypothesis using 18 wood samples collected from various locations around the globe. The sample locations cover a range of<jats:italic>δ</jats:italic>D content of H<jats:sub>2</jats:sub>in precipitation, from below −120‰ in Siberia and Canada to −15‰ in Zimbabwe. The results confirm the predicted dependence of the H<jats:sub>2</jats:sub>isotopic composition on the precipitation in the sampling region. The water content itself is found to at most slightly affect the results. Furthermore,<jats:italic>δ</jats:italic>D of H<jats:sub>2</jats:sub>depends strongly on combustion efficiency. Thus, the isotopic composition of H<jats:sub>2</jats:sub>from biomass burning shows a strong variability around the globe and between different stages of a fire. It is suggested that, rather than a global bulk number, global models that attempt to reproduce the spatial and temporal distribution of<jats:italic>δ</jats:italic>D in H<jats:sub>2</jats:sub>should incorporate explicitly the variability of<jats:italic>δ</jats:italic>D(H<jats:sub>2</jats:sub>) from biomass burning on<jats:italic>δ</jats:italic>D in precipitation.</jats:p>