Table 1 Lifetime estimates of CFC-11, CFC-12, and CCl4 with regard to photochemical removal in the atmosphere (yr) and a comparison with previously published estimates

From: Semi-empirical estimates of stratospheric circulation and the lifetimes of chlorofluorocarbons and carbon tetrachloride

Compound

Mass balance at 400 K

SPARC

CFC-11

50 (43, 57)

52 (43, 67)

CFC-12

86 (75, 99)

102 (88, 122)

CCl4

41 (34, 51)

44 (36, 58)

  1. Values computed in the present study are reported as the mean for 2005 to 2022 with the 95% CI accounting for both statistical and measurement uncertainties (see Methods). Values reported in SPARC account for weighted uncertainties across independent methods, with the uncertainties reported as 2-sigma CIs (see ref.10 for further details).
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