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. 2000 Aug 15;97(18):9875–9880. doi: 10.1073/pnas.170278997

Table 1.

Greenhouse gas radiative forcings

Gas Radiative forcing
CO2 F = f(c) − f(co), where f(c) = 4.996 ln (c + 0.0005c2)
CH4 F = 0.0406(Inline graphic − √Inline graphic) − [g(m, no) − g(mo, no)]
N2O F = 0.136(√Inline graphic − √Inline graphic) − [g(mo, n) − g(mo, no)],  where g(m, n) = 0.5 ln [1 + 2 × 10−5(mn)0.75]
CFC-11 F = 0.264(x xo)
CFC-12 F = 0.323(y − yo)

c, CO2 (ppm); m, CH4 (ppb); n, N2O (ppb); x/y, CFC-11/12 (ppb).