TM5

Babenhauserheide, A., Basu, S., Houweling, S., Peters, W., and Butz, A.: Comparing the CarbonTracker and TM5-4DVar data assimilation systems for CO2 surface flux inversions, Atmos. Chem. Phys., 15, 9747-9763, doi:10.5194/acp-15-9747-2015, 2015.

This papers compares TM5-4DVar with the ensemble kaman filter approach from Carbontracker.

Figure 7: Global fluxes from the baseline runs of TM5-4DVar and CarbonTracker. The Prior is shown in the binning from CarbonTracker. The uncertainties shown for CarbonTracker are aggregated spatially but not temporally. As such they represent the uncertainty of the estimated fluxes, calculated directly from the ensemble. These uncertainties are excluded from the annually aggregated graphs, because there is no method for temporally aggregating the uncertainties in a way which is comparable to the uncertainties estimated by TM5-4DVar. See paper for details.