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Egu2011 2599 presentation
 

Egu2011 2599 presentation

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Presentation given at the European Geosciences Union General Assembly 2011. The work described here is published in Atmospheric Chemistry and Physics Discussions: ...

Presentation given at the European Geosciences Union General Assembly 2011. The work described here is published in Atmospheric Chemistry and Physics Discussions: http://www.atmos-chem-phys-discuss.net/11/10087/2011/acpd-11-10087-2011.html

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  • - Linked to methane cycle - Large uncertainties exist in the global H 2 budget - Expected `Hydrogen economy ’ Expected leakage assumptions from Tromp: All current technologies based on oil or gasoline combustion replaced by H2 fuel cells 10 to 20% leakage
  • Explain delta notation. BB signature is likely more depleted. Hydrogen has large isotope effects (large relative mass difference) -> Isotopic analysis is a useful tool to constrain sources and sinks

Egu2011 2599 presentation Egu2011 2599 presentation Presentation Transcript

  • Temporal and spatial variability in δ (D,H 2 ) : measurement time series from six EUROHYDROS stations Batenburg, A.M. , G. Pieterse, M. Krol, S. Walter, I. Levin, M. Schmidt, A. Jordan, S. Hammer, C. Yver, and T. Röckmann
  • Presentation overview
    • Introduction
      • * Hydrogen
      • * Hydrogen isotopes
      • * The EUROHYDOS network
    • Results & Discussion
    • * Station time series and cycles
    • * Latitudinal gradient
    • * Uptake processes
    • Conclusions
  • The atmospheric H 2 budget
  • Effects of a Hydrogen Economy
  • Isotope δ -notation The δ (D,H 2 ) value represents the deuterium-to-hydrogen ratio in the H 2 relative to a standard (Vienna Standard Mean Ocean Water (VSMOW))
  • Isotopic source signatures Isotopes can be used to gain information about different sources and sinks.
  • The EUROHYDROS network
  • Presentation overview
    • Introduction
      • * Hydrogen
      • * Hydrogen isotopes
      • * The EUROHYDOS network
    • Results & Discussion
    • * Station time series and cycles
    • * Latitudinal gradient
    • * Uptake processes
    • Conclusions
  • Alert
    • Out-of-phase seasonal cycles:
    • D-depleted H 2 accumulates in Winter
    • H 2 removal in Summer, preference for HH over HD
    • Phase shift ≈ 5 months
  • Overview of the time series
  • Latitudinal gradient
    • Larger mixing ratios and δ (D,H 2 ) on the SH
    • Larger seasonal variability on the NH
    • Minimum at NH midlatitudes >>> anthropogenic effect
  • Sink processes Rayleigh fractionation formula: where m (H 2 , max ) is the maximum mixing ratio, c a constant and α the fractionation factor: with k the removal rate of the species
  • NH sink processes: an estimate
    • At the two northernmost stations, soil uptake is (by far) the largest H 2 sink
    • In Cape Verde its relative size is much smaller
  • Presentation overview
    • Introduction
      • * Hydrogen
      • * Hydrogen isotopes
      • * The EUROHYDOS network
    • Results & Discussion
    • * Station time series and cycles
    • * Latitudinal gradient
    • * Uptake processes
    • Conclusions
  • Conclusions
    • Long records of δ (D,H 2 ) have been collected for six globally distributed stations. These provide information on:
    • Seasonal cycles of δ (D,H 2 )
    • The latitudinal distribution of δ (D,H 2 )
    • The sources and sinks of H 2 that affect the stations
  • Questions?
    • More on these observations:
    • A. M. Batenburg, S. Walter, G. Pieterse, I. Levin, M. Schmidt, A. Jordan, S. Hammer, C. Yver, and T. Röckmann, Temporal and spatial variability of the stable isotopic composition of atmospheric molecular hydrogen: observations at six EUROHYDROS stations, Atmos. Chem. Phys. Discuss., 11, 10087-10120, 2011, doi:10.5194/acpd-11-10087-2011
    • δ (D,H 2 ) around the tropopause:
    • Poster XY146, Today (session 3.12)