Project CAMS41 Phase 2
Optimization of CH4 wetland emissions in CTESSEL model using FLUXNET-CH4 dataset

All site simulations are done with the same CTESSEL configuration:

• Low vegetation fraction (CVL): 1, high vegetation fraction (CVH): 0
• Low vegetation type (TVL): PFT13 (Bogs and marshes)
• Vegetation cover (RVCOV): 1
• Reference respiration (RVR0VT): 0.27E-06 kgCO2/m2/s
• Wetland extent fraction: 1 (constant)

The 44 sites are selected out of the total number of 72, showing the optimization improvement on the single-site level.

With the selected sites the multiple-site optimization is performed, grouping the sites by:

• PFT (PFT13)
• TYPE (Bog, Drained, Fen, Lake, Marsh, Rice, Salt marsh, Swamp, Upland, Wet tundra)
• IGBP (BSV, CRO, EBF, ENF, GRA, MF, WAT, WET)
• Dominant vegetation (aerenchymatous, eri_shrub, moss_sphagnum, tree)

In multiple-site optimization one pair of parameters per group is optimized: s (scaling factor) and Q10 (temperature dependency factor)

The best performance is obtained by optimizing with the TYPE grouping, the results are summarized below:

Type	Sites	s	Q10
Bog	6	0.00593	2.06
Drained	1	0.00174	1.41
Fen	7	0.00776	2.06
Lake	1	0.0316	3.79
Marsh	10	0.00922	2.68
Rice	4	0.00834	2.91
Salt marsh	2	0.000314	4
Swamp	3	0.00847	2.32
Upland	3	0.000595	2.64
Wet tundra	7	0.00502	2.1

USAGE	MAP	Single-site optimization	Multi-site optimization (grouped by PFT)	Multi-site optimization (grouped by TYPE)	Multi-site optimization (grouped by IGBP)	Multi-site optimization (grouped by DOMVEG)
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