The Carbon Cycle Data Assimilation System CCDAS - JULES
The Carbon Cycle Data Assimilation System CCDAS - JULES
The Carbon Cycle Data Assimilation System CCDAS - JULES
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„top-down“ vs. „bottom-up“<br />
net CO 2<br />
flux at the<br />
surface<br />
atm. CO 2<br />
data<br />
atmospheric<br />
inversion<br />
(Transport Model)<br />
Process Model<br />
climate and other<br />
driving data<br />
Advantages:<br />
• Fluxes consistent with<br />
atm. data<br />
• Estimation of uncertainties<br />
Disadvantages:<br />
• No process information<br />
• Depends on prior assumptions<br />
Advantages:<br />
• Process understanding<br />
-> prognostic modeling<br />
• High resolution<br />
Disadvantages:<br />
• Global validation difficult<br />
• Parameter validity
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