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WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov. 12-13, 2009 WG-B2: Effectiveness of methane transport.

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Presentation on theme: "WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov. 12-13, 2009 WG-B2: Effectiveness of methane transport."— Presentation transcript:

1 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , 2009 WG-B2: Effectiveness of methane transport through the water column (ocean and lakes) and assessment of methane flux into the atmosphere

2 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , Input into the water column Spatio-temporal variations Changes due to enhanced anthropogenic forcing Gas transport through the water column Dissolution and gas invasion Impact of oil and organic films Plume dynamics Saturation potential (Lakes, Lake Nyos scenario) Gas transport in the water column Circulation Stratification Aerobic oxidation in water column Turnover rates as a function of T and C Methane Adaptation time scale Oxidation at the water ice interface Ice cover related questions Gas migration through and along ice Temporal release Air Sea Exchange Interplay of ice cover, stratification, and wind field in a spatio-temporal framework

3 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , 2009 Modified from Schneider von Deimling, PhD thesis, University Kiel, 2009 Geochemistry Hydroacoustic CH 4 in the water column: where do we start with? 3

4 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , From Shakhova and Semiletov, Arctic workshop Texel, 2009

5 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , Gas transport through the water column Dissolution and gas invasion Impact of oil and organic films Plume dynamics Saturation potential (Lakes, Lake Nyos scenario) Various gas migration models with still large differences in parameterization (McGinnes, Leifer, Zhang and Yapa…) Streamlining Gap in experimental parameterization? Plume model characteristics usually not straightforward We are dealing with shallow waters, so is it an issue for a time-averaged flux, or just for annual pulsing? Behavior of gas trapped under ice

6 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , Gas transport in the water column Circulation Stratification From Shakhova and Semiletov, Arctic workshop Texel, 2009

7 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , Gas transport in the water column Circulation Stratification From Shakhova and Semiletov, Arctic workshop Texel, 2009

8 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , Aerobic oxidation in water column Turnover rates as a function of T and C Methane Adaptation time scale Oxidation at the water ice interface Turnovertimes for methane oxidation in the water column, various sources Decrease in turnover rates with decreasing concentrations Faster specific oxidation rates at same concentrations in warmer settings 

9 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , Ice cover related questions Gas migration through and along ice Temporal release (giving crucial time scale) Oxidation at the water ice interface

10 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , Sea-ice change Changes ASE-protected time slot Changes freshwater dynamics (stratification)

11 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , Air Sea Exchange Interplay of ice cover, stratification, and wind field in a spatio-temporal framework Regional circulation model with wind field and ice model available? Can remote sensing do a better job?

12 WG B2: Water Column Transport and _Air-Sea Fluxes Cost Action PERGAMON Kick Off, Bruxelles, Nov , The area is just to big for the usual approaches


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