Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 417246
Title Global modelling of H2 mixing ratios and isotopic compositions with the TM5 model
Author(s) Pieterse, G.; Krol, M.C.; Batenburg, A.M.; Steele, L.P.; Krummel, P.B.; Langenfelds, R.L.; Röckmann, T.
Source Atmospheric Chemistry and Physics 11 (2011)14. - ISSN 1680-7316 - p. 7001 - 7026.
DOI https://doi.org/10.5194/acp-11-7001-2011
Department(s) Meteorology and Air Quality
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) dry deposition parameterization - european photoreactor facility - tropospheric photolysis rates - general-circulation model - molecular-hydrogen - atmospheric chemistry - lowermost stratosphere - photochemical data - transport - impact
Abstract The isotopic composition of molecular hydrogen (H2) contains independent information for constraining the global H2 budget. To explore this, we have implemented hydrogen sources and sinks, including their isotopic composition, into the global chemistry transport model TM5. For the first time, a global model now includes a simplified but explicit isotope reaction scheme for the photochemical production of H2. We present a comparison of modelled results for the H2 mixing ratio and isotope composition with available measurements on the seasonal to inter annual time scales for the years 2001–2007. The base model results agree well with observations for H2 mixing ratios. For dD[H2], modelled values are slightly lower than measurements. A detailed sensitivity study is performed to identify the most important parameters for modelling the isotopic composition of H2. The results show that on the global scale, the discrepancy between model and measurements can be closed by adjusting the default values of the isotope effects in deposition, photochemistry and the stratosphere-troposphere exchange within the known range of uncertainty. However, the available isotope data do not provide sufficient information to uniquely constrain the global isotope budget. Therefore, additional studies focussing on the isotopic composition near the tropopause and on the isotope effects in the photochemistry and deposition are recommended.
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