Table 2.

Best estimates and high/low limits of the 90% likelihood ranges for aviation RF components derived in this paper and for the total CO₂ RF and net anthropogenic RF from Forster et al. (2007a).

Aviation RFs										Anthropogenic RFs
RF (mW m−2)	CO2	O3	CH4	Total NOx (O3 + CH4)	H2O	Contrails	SO4	Soot	AIC	Total CO2	Total (excl. AIC)
2005 best estimatea	28.0	26.3	−12.5	12.6	2.8	11.8	−4.8	3.4	33	1660	1600
2005 low	15.2	8.4	−2.1	3.8	0.39	5.4	−0.79	0.56	12.5	1490	600
2005 high	40.8	82.3	−76.2	15.7	20.3	25.6	29.3	20.7	86.7	1830	2400
Distribution type	Normal	Lognorm.	Lognorm.	Discrete pdf	Lognorm.	Lognorm.	Lognorm.	Lognorm.	Lognorm.	Normal	Discrete PDF

Notes: Estimates of aviation uncertainty based on IPCC (1999) except for linear contrails and AIC which employ uncertainty estimates from IPCC AR4 WGI (2007). Note that IPCC (1999) used 67% uncertainty ranges compared to the 90% likelihood ranges used here. Non-aviation RFs and their uncertainty are taken directly from Forster et al. (2007a).

^aValues from Table 1.