1. Utilizing Ocean Carbon Data to quantify CO2 Air-Sea Fluxes

2. Objective: Quantify CO 2 Air-Sea Fluxes Air-Sea Fluxes POC Export Circulation

3. How to separate and quantify gas exchange flux from effects of circulation and bio-geochemistry?Challenge… Question… What are the errors in estimated CO 2 air-sea fluxes?

4. Ongoing work.Ongoing work. Several groups working on this problem.Several groups working on this problem. No final answers.No final answers. Answer depends on product of interestAnswer depends on product of interest (local vs. basin or global integral) Preliminary estimates basin-integrated fluxes.Preliminary estimates basin-integrated fluxes.

5. Mikaloff Fletcher, 2007 this study Schlitzer, in prep Pre-industrial air-sea CO2 fluxes

6. Difference of estimated fluxes: 10 – 50 % Sensitivity studies M. Gerber (U Bern): similar differences

7. CO 2 (and O 2 ) air-sea fluxes can be deduced from water column budgets.CO 2 (and O 2 ) air-sea fluxes can be deduced from water column budgets. Quality of flux results depends on quality of physical and bio- geochemical fluxes (multi-tracer approach, combination of different data types, etc.)Quality of CO 2 flux results depends on quality of physical and bio- geochemical fluxes (multi-tracer approach, combination of different data types, etc.) Sparseness of water column data limits temporal and spatial resolution.Sparseness of water column data limits temporal and spatial resolution. Quest for more data.Quest for more data. Surface and water columnSurface and water column Repeat occupations and time series dataRepeat occupations and time series data