Table 5.

Emission metrics and corresponding CO₂-equivalent emissions for the ERF components of 2018 aviation emissions and cloudiness.

Metrics
ERF term	GWP20	GWP50	GWP100	GTP20	GTP50	GTP100
CO2	1	1	1	1	1	1
Contrail cirrus (Tg CO2 basis)	2.32	1.09	0.63	0.67	0.11	0.09
Contrail cirrus (km basis)	39	18	11	11	1.8	1.5
Net NOx	619	205	114	−222	−69	13
Aerosol-radiation
Soot emissions	4288	2018	1166	1245	195	161
SO2 emissions	−832	−392	−226	−241	−38	−31
Water vapor emissions	0.22	0.10	0.06	0.07	0.01	0.008

CO2-eq emissions (Tg CO2 yr−1) for 2018
ERF term	GWP20	GWP50	GWP100	GTP20	GTP50	GTP100	GWP*100 (E*CO2e)
CO2	1034	1034	1034	1034	1034	1034	1034
Contrail cirrus (Tg CO2 basis)	2399	1129	652	695	109	90	1834
Contrail cirrus (km basis)	2395	1127	651	694	109	90	1834
Net NOx	887	293	163	−318	−99	19	339
Aerosol-radiation
Soot emissions	40	19	11	12	2	2	20
SO2 emissions	−310	−146	−84	−90	−14	−12	−158
Water vapor emissions	83	39	23	27	4	3	42
Total CO2-eq (using km basis)	4128	2366	1797	1358	1035	1135	3111
Total CO2-eq/CO2	4.0	2.3	1.7	1.3	1.0	1.1	3.0