ITEMS

HONRS16group2-GlobalWarmingPotential

Notes:
a The CO2 response function used in this report is based on the revised version of the Bern Carbon cycle model (Bern2.5CC; Joos et al. 2001) using a background CO2 concentration value of 378 ppm. The decay of a pulse of CO2 with time t is given by

Where a0 = 0.217, a1 = 0.259, a2 = 0.338, a3 = 0.186, τ1 = 172.9 years, τ2 = 18.51 years, and τ3 = 1.186 years.

b The radiative efficiency of CO2 is calculated using the IPCC (1990) simplified expression as revised in the TAR, with an updated background concentration value of 378 ppm and a perturbation of +1 ppm

c The perturbation lifetime for methane is 12 years as in the TAR. The GWP for methane includes indirect effects from enhancements of ozone and stratospheric water vapor.

https://www.ipcc.ch/publications_and_data/ar4/wg1/en/ch2s2-10-2.html

2007