1. Establish the framework for repeated anthropogenic CO 2 (C ant ) inventory quantification within the Atlantic Ocean basin, including its polar extensions and the European marginal seas Create interfaces between CarboOcean activities and related international activities in order to permit global ocean inventory estimates. WP 3: Long Term Assessment

2. Where did we start? after Sabine et al. (2004), Science 305, 367-371. Column inventory of anthropogenic CO 2 in the ocean (mol m -2 ) Net uptake of anthropogenic CO 2 (1800-1994): 118 ± 19 Pg C yr -1 = 48% of the emissions WP 3

3. GLODAP – a product of a decade-long global effort JGOFS/WOCE CO 2 survey (  GLODAP) WP 3

4. CARINA – from a slow start to a CARBOOCEAN legacy WP 3 CARINA – already a CARBOOCEAN legacy

5. Anthropogenic CO 2 methodology WP 3 CARBOOCEAN has populated the zoo of C T ant methods Did we agree on THE optimal method? – Not really, but... Vázquez-Rodríguez et al. (2009), Biogeosciences 6, 439-451.

6. Anthropogenic CO 2 methodology WP 3 Two thing to learn: the methods are rather robust the differences point to general weaknesses of general assumptions Vázquez-Rodríguez et al. (2009), Biogeosciences 6, 439-451.

7. CARINA – from a slow start to a CARBOOCEAN legacy WP 3

8. Interior carbon synthesis WP 3 Resolutions: Address decadal carbon change basin by basin Calculate change in storage of both DIC and C T ant Apply different C T ant methods (e.g.  C*, eMLR, TTD) to evaluate robustness of the distributions Use a model-based analysis to provide „best practices“ recommendation for MLR-based approach Synthesize basin studies into global picture of the decadal change of interior ocean carbon storage

9. Atlantic Pacific Indian Southern Arctic 2012201120102009 Tanhua Ishii Sabine Hoppema Bates Global Synthesis Paper published 8/128/11 Basin-wide Studies completed 2 nd synthesis Workshops 6/106/11 3 rd synthesis Workshop Together with SOCAT Regional Synthesis Paper published 3/12 Global Study completed Data/ Methods By ocean basin  C ant,  DIC 2 nd QC  C ant,  DIC interpolation 2 nd QC  C ant,  DIC interpolation Interpol 1 Interpol 2 eMLR dens interpolation Rodgers? Key „best practices“ Interior carbon synthesis timeline – towards IPCC AR5 WP 3

10. The way beyond CARBOOCEAN: The OceanObs’09 vision

11. The way beyond CARBOOCEAN: Repeat Hydrography Program

12. WOCE CLIVAR ? post-CLIVAR ~10 years~15 years? The way beyond CARBOOCEAN: Repeat Hydrography Program

13. t DIC How to capture natural spatiotemporal variability

14. The way beyond CARBOOCEAN: ARGO Oxygen Program

15. Objectives: Understand oceanic oxygen dynamics in view of their carbon- relevance; Establish temporal change of oceanic oxygen inventory; Improve atmospheric O 2 /N 2 constraint on the oceanic uptake of anthropogenic CO 2 ; Help to interpret and interpolate sparse data from repeat hydrography occupations and ocean time-series; Refine oxygen boundary condition as a critical information for CTant methods Aid interpretation of variations in ocean circulation/mixing as well as net community and export production.