Batenburg caribic seeheim2011

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Presentation given at CARIBIC workshop at Lufthansa Training & Conference Center Seeheim (Germany), October 2011.

This material is now online as a discussion paper in ACPD, that can be found on http://www.atmos-chem-phys-discuss.net/12/589/2012/acpd-12-589-2012.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
  • Adapt tp Pieterse values 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
  • Maybe remove/correct title. Add coords?
  • Batenburg caribic seeheim2011

    1. 1. “ CARIBIC based D/H measurements for understanding the molecular hydrogen (H 2 ) cycle” by Anneke M. Batenburg et al. is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Please include a proper attribution when using this work. The material that was presented in this presentation was later published in a discussion paper in ACPD, that can be found on: http://www.atmos-chem-phys-discuss.net/12/589/2012/acpd-12-589-2012.html
    2. 2. CARIBIC based D/H measurements for understanding the molecular hydrogen (H 2 ) cycle A.M. Batenburg , T.J. Schuck, A.K. Baker, A. Zahn, C.A.M. Brenninkmeijer, T. R öckmann
    3. 3. Presentation overview <ul><li>Introduction </li></ul><ul><ul><li>* Hydrogen (H 2 ) </li></ul></ul><ul><ul><li>* Hydrogen isotopes </li></ul></ul><ul><ul><li>* Ground station data </li></ul></ul><ul><li>Results & Discussion </li></ul><ul><ul><li>* A first look </li></ul></ul><ul><li>* Pollution signatures </li></ul><ul><li>* Lower stratosphere </li></ul><ul><li>* Summer monsoon </li></ul><ul><li>Summary </li></ul>
    4. 4. The atmospheric H 2 budget
    5. 5. Effects of a Hydrogen Economy
    6. 6. 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))
    7. 7. Isotopic source signatures Isotopes can be used to gain information about different sources and sinks.
    8. 8. The EUROHYDROS network Batenburg et al., 2011 http://www.atmos-chem-phys.net/11/6985/2011/acp-11-6985-2011.html
    9. 9. EUROHYDROS data
    10. 10. Presentation overview <ul><li>Introduction </li></ul><ul><ul><li>* Hydrogen (H 2 ) </li></ul></ul><ul><ul><li>* Hydrogen isotopes </li></ul></ul><ul><ul><li>* Ground station data </li></ul></ul><ul><li>Results & Discussion </li></ul><ul><ul><li>* A first look </li></ul></ul><ul><li>* Pollution signatures </li></ul><ul><li>* Lower stratosphere </li></ul><ul><li>* Summer monsoon </li></ul><ul><li>Summary </li></ul>
    11. 11. Results: a first look
    12. 12. A first look: Caracas flights
    13. 13. “ Polluted” samples <ul><li>Strong depletions </li></ul><ul><li>Tendency to occur close to airports: Contrails? </li></ul><ul><li>Source signature lower than expected for fossil fuels </li></ul><ul><li>No clear relation with other species </li></ul>
    14. 14. Presentation overview <ul><li>Introduction </li></ul><ul><ul><li>* Hydrogen (H 2 ) </li></ul></ul><ul><ul><li>* Hydrogen isotopes </li></ul></ul><ul><ul><li>* Ground station data </li></ul></ul><ul><li>Results & Discussion </li></ul><ul><ul><li>* A first look </li></ul></ul><ul><li>* Pollution signatures </li></ul><ul><li>* Lower stratosphere </li></ul><ul><li>* Summer monsoon </li></ul><ul><li>Summary </li></ul>
    15. 15. Stratospheric H 2 cycle CH 4 H 2 H 2 O Source: Hydrocarbon oxidation Enriched in D Sink: Oxidation by OH Preferentially removes H Result of stratospheric processing: H 2 mixing ratio changes little, while δD increases dramatically.
    16. 16. Stratospheric input Pieterse et al., 2011 http://www.atmos-chem-phys.net/11/7001/2011/acp-11-7001-2011.html
    17. 17. Stratospheric samples Vertical gradient in δD(H 2 ), but not in mixing ratio
    18. 18. Stratospheric samples δD(H 2 ) `mirrors’ methane
    19. 19. Stratospheric correlations
    20. 20. Comparison to previous work
    21. 21. Presentation overview <ul><li>Introduction </li></ul><ul><ul><li>* Hydrogen (H 2 ) </li></ul></ul><ul><ul><li>* Hydrogen isotopes </li></ul></ul><ul><ul><li>* Ground station data </li></ul></ul><ul><li>Results & Discussion </li></ul><ul><ul><li>* A first look </li></ul></ul><ul><li>* Pollution signatures </li></ul><ul><li>* Lower stratosphere </li></ul><ul><li>* Summer monsoon </li></ul><ul><li>Summary </li></ul>
    22. 22. Summer monsoon GHG data Enhanced mixing ratios of Greenhouse gases occur in from May until September, with a maximum in August. ( T.J. Schuck et al. 2010)
    23. 23. δD lowering in monsoon
    24. 24. Correlation with methane
    25. 25. Some estimates The mass conservation formula: <ul><li>can be used to calculate how much H 2 is needed to lower the background δD from ≈137‰ to ≈122‰ at a background m(H 2 ) of 560 ppb. </li></ul><ul><li>With δD p =-260‰ (biomass burning): ≈ 21 ppb </li></ul><ul><li>With δD p =-628‰ (microbial): ≈ 11 ppb </li></ul><ul><li>Our m(H 2 ) uncertainty is about 560*2.5%=14 ppb. </li></ul><ul><li>➔ Microbial production likely contributed to the D-depletion during summer monsoon </li></ul>
    26. 26. Presentation overview <ul><li>Introduction </li></ul><ul><ul><li>* Hydrogen (H 2 ) </li></ul></ul><ul><ul><li>* Hydrogen isotopes </li></ul></ul><ul><ul><li>* Ground station data </li></ul></ul><ul><li>Results & Discussion </li></ul><ul><ul><li>* A first look </li></ul></ul><ul><li>* Pollution signatures </li></ul><ul><li>* Lower stratosphere </li></ul><ul><li>* Summer monsoon </li></ul><ul><li>Summary </li></ul>
    27. 27. Summary <ul><li>A large δD dataset was collected in the UTLS region </li></ul><ul><li>Some samples appear polluted by an unknown, very D-depleted source </li></ul><ul><li>In the LS, a strong correlation is found between CH 4 and δ D , that can be used to improve δ D in models </li></ul><ul><li>A lowering of δ D values appears over India during summer monsoon , correlated to the CH 4 ; possibly microbial sources </li></ul>

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