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• Establish the framework for repeated anthropogenic CO2 (Cant) 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
Where did we start?
after Sabine et al. (2004), Science 305, 367-371.
Column inventory of anthropogenic CO2 in the ocean (mol m-2)
Net uptake of anthropogenic CO2 (1800-1994):
118 ± 19 Pg C yr-1 = 48% of the emissions
WP 3
GLODAP – a product of a decade-long global effort
JGOFS/WOCECO2 survey
( GLODAP)
WP 3
CARINA – from a slow start to a CARBOOCEAN legacy WP 3
CARINA – already a CARBOOCEAN legacy
Anthropogenic CO2 methodology WP 3
CARBOOCEAN has populated the zoo of CT
ant methods
Did we agree on THE optimal method? – Not really, but ...
Vázquez-Rodríguez et al. (2009), Biogeosciences 6, 439-451.
Anthropogenic CO2 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.
CARINA – from a slow start to a CARBOOCEAN legacy WP 3
Interior carbon synthesis WP 3
Resolutions:
• Address decadal carbon change basin by basin
• Calculate change in storage of both DIC and CTant
• Apply different CTant 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
Atlantic
Pacific
Indian
Southern
Arctic
2012201120102009
Tanhua
Ishii
Sabine
Hoppema
Bates
Global Synthesis
Paper published
8/128/11
Basin-wideStudies
completed
2nd synthesisWorkshops
6/10 6/11
3rd synthesisWorkshop
Together withSOCAT
RegionalSynthesis
Paper published
3/12
GlobalStudy
completed
Data/Methods
By ocean basin
Cant, DIC
2nd QC Cant, DIC
interpolation
interpolation
2nd QC
Cant, DIC
Cant, DIC interpolation
Interpol 1 Interpol 2
eMLRdens interpolationRodgers?Key „best practices“
Interior carbon synthesis timeline – towards IPCC AR5 WP 3
The way beyond CARBOOCEAN: The OceanObs’09 vision
The way beyond CARBOOCEAN: Repeat Hydrography Program
WOCE CLIVAR
?
post-CLIVAR
~10 years ~15 years ?
The way beyond CARBOOCEAN: Repeat Hydrography Program
t
DIC
How to capture natural spatiotemporal variability
The way beyond CARBOOCEAN: ARGO Oxygen Program
The way beyond CARBOOCEAN: ARGO Oxygen Program
Objectives:
• Understand oceanic oxygen dynamics in view of their carbon-relevance;
• Establish temporal change of oceanic oxygen inventory;
• Improve atmospheric O2/N2 constraint on the oceanic uptake of
anthropogenic CO2;
• 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.