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Dr Jan Kaiser Dr Parvadha Suntharalingam

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Dr Jan Kaiser Dr Parvadha Suntharalingam

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    1. Dr Jan Kaiser Dr Parvadha Suntharalingam The stratospheric sink of N2O – the impact upon climate change

    2. N2O mixing ratios in the past

    3. Atmospheric N2O budget: Surface sources

    4. Atmospheric N2O budget: Destruction in the stratosphere

    5. Catalytic O3 destruction in the stratosphere Initiation: N2O + O* ? 2 NO Catalytic cycle: NO + O3 ? NO2 + O2 O3 + UV light ? O2 + O NO2 + O ? NO + O2 Net: 2 O3 ? 3 O2

    6. Position-dependent N2O isotope measurements

    7. Launch of stratospheric balloons

    8. Isotope fractionation in the stratosphere

    9. Isotope fractionation by N2O + O*

    10. Contribution of photo-oxidation to total stratospheric N2O destruction

    11. N2O isotope budget

    12. Oxygen isotope anomalies in atmospheric compounds

    13. Spreading of oxygen isotope anomalies in through the atmosphere and climate system

    14. Summary so far … N2O is stable in the lower atmosphere. In the stratosphere, it breaks down to NO and contributes to O3 destruction. Position-dependent isotope measurements give unique insights into stratospheric N2O loss reactions N2O (isotope) budgets contributions of different N2O sources mechanisms of enzymatic reactions Oxygen isotope anomalies leave fingerprints of atmospheric processes and indicate, for example, atmospheric nitrate inputs into aqueous and terrestrial ecosystems.

    15. Numerical modelling of biogeochemical cycles

    16. N2O in the surface ocean

    17. Marine N2O production

    18. Marine N2O formation depends on oxygen level

    19. Modelling the marine nitrous oxide cycle

    20. Atmospheric N2O variations from ice cores

    21. N2O fluxes and global change What are the impacts of global change on N2O fluxes?

    22. N2O fluxes and climate feedbacks Are feedbacks between the N2O cycle and climate positive or negative ?

    23. Climate feedbacks: Soil N2O Fluxes

    24. Climate feedbacks: Ocean N2O fluxes

    25. Impact on marine N2O: Nutrient runoff in coastal zones

    26. Impact on marine N2O: Anthropogenic nitrogen deposition Anthropogenic Nitrogen Deposition

    27. Impact on marine N2O: Atmospheric CO2 induced warming

    28. Summary Marine N2O formation is sensitive to local environmental conditions, in particular, oxygen concentration and biological productivity. Anthropogenic nitrogen input to the open and coastal ocean is predicted to increase; the implications for the global marine N2O source are not well quantified. The overall climate-oceanic N2O flux feedback depends on several competing factors. Our present understanding of the net feedback is low.

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