Table 2. Overview Over the Differences Between the Five TM5 Model Simulations Used for Comparison With the BARCA Observations (PB, PB-SCI, SH, SH-SCI, and CT)a


	PB-SCI	PB	SH-SCI	SH	CT

Prior Fluxes
Wetlands	'JK' inventory [Bergamaschi et al., 2007]	'JK' inventory [Bergamaschi et al., 2007]	LPJ-WhyME [Wania, 2007]	LPJ-WhyME [Wania, 2007]	Matthews and Fung [1987]
Biomass burning	GFEDv2 [van der Werf et al., 2004] (average 1997-2007)	GFEDv2 [van der Werf et al., 2004] (average 1997-2007)	GFEDv2 [van der Werf et al., 2004] (2008)	GFEDv2 [van der Werf et al., 2004] (2008)	GFEDv2 [van der Werf et al., 2004] (2008, 2009)
Anthropogenic emissions	EDGARV4.0 (S. Monni et al., manuscript in preparation, 2010)	EDGARV4.0 (S. Monni et al., manuscript in preparation, 2010)	EDGARV4.0 Extrapolated using BP statistics [Olivier and Berdowski, 2001]	EDGARV4.0 Extrapolated using BP statistics [Olivier and Berdowski, 2001]	EDGAR 3 [Olivier and Berdowski, 2001]

Model Setup
Inversion technique	4DVAR	4DVAR	4DVAR	4DVAR	Ensemble Kalman Filter
Number of NOAA surface stations	32	32	46	46	80
SCIAMACHY retrieval	IMAP V5.5 [Frankenberg et al., 2011]	-	IMAP V5.5 [Frankenberg et al., 2011]	-	-
Meteorology	ECMWF ERA interim	ECMWF ERA interim	ECMWF ERA interim	ECMWF ERA interim	ECMWF operational
Horizontal resolution	6degree x 4degree	6degree x 4degree	6degree x 4degree	6degree x 4degree	6degree x 4degree
Number of vertical layers	25	25	25	25	25
OH fields	Carbon Bond Mechanism 4 (CBM-4)	Carbon Bond Mechanism 4 (CBM-4)	Spivakovsky et al. [2000]	Spivakovsky et al. [2000]	Spivakovsky et al. [2000]
Runtime period	15 months	15 months	01/2007-12/2009	01/2007-12/2009	01/2000-12/2009

aThe source of prior fluxes for the most important CH4 emission sources, the number of NOAA-ESRL surface stations used for the inversion, the version of the SCIAMACHY retrievals (for PB-SCI and SH-SCI), and basic information is shown.