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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• Terrestrial biosphere model<br />
BETHY (Knorr 97) delivers CO 2<br />
fluxes to atmosphere<br />
<strong>CCDAS</strong> calibration step<br />
• Uncertainty in process parameters<br />
from laboratory measurements<br />
• Global atmospheric network<br />
provides additional constraint<br />
covariance of uncertainty<br />
in priors for parameters<br />
covariance of uncertainty in<br />
measurements + model<br />
priors for parameters<br />
observed concentrations<br />
J( p ) = 1 2<br />
<br />
[ p − p <br />
0 ] T -1 <br />
C p 0<br />
[ p − p <br />
0 ]+ 1 2<br />
<br />
[ y ( p ) − y <br />
0 ] T -1 <br />
C y 0<br />
[ y ( p ) − y <br />
0 ]
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