Emission ratio and isotopic signatures of molecular hydrogen emissions from tropical biomass burning

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Author(s) Haumann, F. Alexander, Batenburg, Anneke M., Pieterse, Gerben, Gerbig, Christoph, Krol, Maarten C., Röckmann, Thomas
Publication Type Journal Items, Publication Status: Published
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Title Emission ratio and isotopic signatures of molecular hydrogen emissions from tropical biomass burning
Author(s) Haumann, F. Alexander
Batenburg, Anneke M.
Pieterse, Gerben
Gerbig, Christoph
Krol, Maarten C.
Röckmann, Thomas
Journal or Series Title Atmospheric chemistry and physics : ACP
Volume Number 13
Issue Number 18
Start Page 9401
End Page 9413
ISSN 1680-7316
Publisher European Geophysical Society
Publication Place Katlenburg-Lindau
Publication Date 2013
Abstract In this study, we identify a biomass-burning signal in molecular hydrogen (H2) over the Amazonian tropical rainforest. To quantify this signal, we measure the mixing ratios of H2 and several other species as well as the H2 isotopic composition in air samples that were collected in the BARCA (Balanço Atmosférico Regional de Carbono na Amazônia) aircraft campaign during the dry season. We derive a relative H2 emission ratio with respect to carbon monoxide (CO) of 0.31 ± 0.04 ppb ppb−1 and an isotopic source signature of −280 ± 41‰ in the air masses influenced by tropical biomass burning. In order to retrieve a clear source signal that is not influenced by the soil uptake of H2, we exclude samples from the atmospheric boundary layer. This procedure is supported by data from a global chemistry transport model. The ΔH2 / ΔCO emission ratio is significantly lower than some earlier estimates for the tropical rainforest. In addition, our results confirm the lower values of the previously conflicting estimates of the H2 isotopic source signature from biomass burning. These values for the emission ratio and isotopic source signatures of H2 from tropical biomass burning can be used in future bottom-up and top-down approaches aiming to constrain the strength of the biomass-burning source for H2. Hitherto, these two quantities relied only on combustion experiments or on statistical relations, since no direct signal had been obtained from in-situ observations.
DOI 10.5194/acp-13-9401-2013
Additional Notes Received 27 February 2013, Published in Atmos. Chem. Phys. Discuss. 25 April 2013, Revised 26 July 2013, Accepted 14 August 2013, Published 24 September 2013
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 004294181
Source Database ID FORM-1384434733
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  author = "Haumann, F. Alexander and Batenburg, Anneke M. and Pieterse, Gerben and Gerbig, Christoph and Krol, Maarten C. and R{\"{o}}ckmann, Thomas",
  title = "{E}mission ratio and isotopic signatures of molecular hydrogen emissions from tropical biomass burning",
  journal = "Atmospheric chemistry and physics : ACP",
  year = 2013,
  volume = "13",
  number = "18",
  pages = "9401--9413",

E-Citations record created: Thu, 14 Nov 2013, 13:12:38 CET