Table D.3.

Methane response in TROPOS and other studies

Variable	Year	2D CTM, TROPOS		Literature
		Transient	Steady-statea	Study	Ref	Model/Years	Variable estimate/change
CH4 burden, Tg	2000	4770.8	4785.1
				IPCC TAR		1998	4850 Tg
				Voulgarakis et al. (2013)		ACCMIP	4750d Tg
				Dalsøren et al. (2016)		Oslo CTM3	4560d Tg
				Dalsøren et al. (2016)		1970–2012	+15%
				This studyc			+13%
	2050	5051.6	5081.4	Voulgarakis et al. (2013) Voulgarakis et al. (2013) This studyc		ACCMIP	5000d Tg +5.3d % +5.9%
						2000–2050
CH4 abundance, ppb	2000	1784.2	1787.5	Observations		NOAA AGAGE WDCGG	1773 ppb 1774 ppb 1783 ppb
	2050	1886.2	1897.6	Meinshausen et al. (2011)		MAGICC	1833 ppb
CH4 lifetime (τCH4+OH)b, yr	2000	10.6	10.5	Prather et al. (2012) Voulgarakis et al. (2013) Holmes et al. (2013) This studyc Voulgarakis et al. (2013) This studyc		CH3CCl3-based	11.2 ± 1.3 yr 9.8 ± 1.6 yr −2.2 ± 1.8% −2.06% −4% −2%
						ACCMIP
						1980/85–2000/05
						1980–2000
	2050	11.0	11.0	Voulgarakis et al. (2013) This studyc		2000–2050	+1.0d % +3.5%
aircraft CH4 lifetime (τCH4+OH), yr	2000	−0.137	−0.145	Hoor et al. (2009) Myhre et al. (2011) Holmes et al. (2011) Søvde et al. (2014) This studyc		AERO2K QUANTIFY Model ensemble REACT4C dENOx = QUANTIFY	−1.55% Tg(N)−1
							−1.46% Tg(N)−1
							−1.77% Tg(N)−1
							−1.36% Tg(N)−1
							−1.48% Tg(N)−1
	2050	−0.293	−0.311	Hodnebrog et al. (2011)		SRES B1	−1.61% Tg(N)−1
						B1 ACARE	−1.48% Tg(N)−1
				Hodnebrog et al. (2012)		SRES A1B	−1.22% Tg(N)−1
				Khodayari et al. (2014a)		AEDT Scenario1	−1.88% Tg(N)−1
						AEDT Baseline	−1.59% Tg(N)−1
				This studyc		RCP45	−1.36% Tg(N)−1

^athis is an average of the last 10 years of simulations

^bthe chemcial (τ_CH4+OH) lifetime is around 7% greater than the total CH₄ lifetime, as modelled by TROPOS

^cnumbers are based on transient simulation

^dnumbers might not be very accurate as they are read directly from the graphs found in the respecitve papers