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)
USE
DROP
USE
USE
FINAL USE
USE
DROP
DROP
DROP
DROP
FINAL USE
FINAL USE
DROP
USE
FINAL USE
FINAL USE
USE
DROP
DROP
FINAL USE
FINAL USE
USE
FINAL USE
DROP
FINAL USE
DROP
FINAL USE
FINAL USE
DROP
DROP
FINAL USE
DROP
FINAL USE
DROP
USE
USE
FINAL USE
DROP
USE
FINAL USE
DROP
DROP
DROP
USE
DROP
DROP
USE
USE
DROP
USE
USE
DROP
FINAL USE
FINAL USE
FINAL USE
FINAL USE
DROP
DROP
USE
USE
FINAL USE
DROP
USE
USE
USE
FINAL USE
DROP
USE
USE
DROP
DROP
FINAL USE