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  Heavy hydrogen in the stratosphere

Röckmann, T., Rhee, T. S., & Engel, A. (2003). Heavy hydrogen in the stratosphere. Atmospheric Chemistry and Physics, 3, 2015-2023.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-8E3C-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-8E3D-D
Genre: Journal Article
Alternative Title : Atmos. Chem. Phys.

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 Creators:
Röckmann, T.1, Author              
Rhee, T. S.2, Author              
Engel, A., Author
Affiliations:
1External Organizations, escidoc:persistent22              
2Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, escidoc:1826285              

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 Abstract: We report measurements of the deuterium content of molecular hydrogen (H2) obtained from a suite of air samples that were collected during a stratospheric balloon flight between 12 and 33 km at 40º N in October 2002. Strong deuterium enrichments of up to 400‰ versus Vienna Standard Mean Ocean Water (VSMOW) are observed, while the H2 mixing ratio remains virtually constant. Thus, as hydrogen is processed through the H2 reservoir in the stratosphere, deuterium is accumulated in H2 . Using box model calculations we investigated the effects of H2 sources and sinks on the stratospheric enrichments. Results show that considerable isotope enrichments in the production of H2 from CH4 must take place, i.e., deuterium is transferred preferentially to H2 during the CH4 oxidation sequence. This supports recent conclusions from tropospheric H2 isotope measurements which show that H2 produced photochemically from CH4 and non-methane hydrocarbons must be enriched in deuterium to balance the tropospheric hydrogen isotope budget. In the absence of further data on isotope fractionations in the individual reaction steps of the CH4 oxidation sequence, this effect cannot be investigated further at present. Our measurements imply that molecular hydrogen has to be taken into account when the hydrogen isotope budget in the stratosphere is investigated.

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Language(s): eng - English
 Dates: 2003-11-19
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 120047
ISI: 000186675400001
 Degree: -

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Title: Atmospheric Chemistry and Physics
  Alternative Title : Atmos. Chem. Phys.
Source Genre: Journal
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Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 3 Sequence Number: - Start / End Page: 2015 - 2023 Identifier: ISSN: 1680-7324