3. Global Warming Potentials
According to the Intergovernmental Panel on Climate Change (IPCC), the global warming potential (GWP) of a greenhouse gas is defined as the ratio of the time- integrated radiative forcing from the instantaneous release of 1 kilogram (kg) of a trace substance relative to that of 1 kg of a reference gas. The reference gas used is CO2. The values given below are those reported in the IPCC Second Assessment Report (IPCC 1996). These values are used to be consistent with other statewide and national Greenhouse Gas (GHG) inventories. Operators must use these values when converting emissions of greenhouse gases to carbon dioxide equivalent values (CO2e) for purposes of estimating de minimis or other emissions as specified in this article.
Table 2. Global Warming Potentials (100-Year Time
CO2 CH4* N2O HFC-23 HFC-32 HFC-125 HFC-134a HFC-143a HFC-152a HFC-227ea HFC-236fa HFC-4310mee CF4 C2F6 C4F10 C6F14 SF6
1 21 310 11,700 650 2,800 1,300 3,800 140 2,900 6,300 1,300 6,500 9,200 7,000 7,400 23,900
The CH4 GWP includes the direct effects and those indirect effects
due to the production of tropospheric ozone and stratospheric water vapor. The indirect effect due to the production of CO2 is not included.
Source: IPCC Climate Change 1995: The Science of Climate Change.
Intergovernmental Panel on Climate Change, J.T. Houghton,
G. Meira Filho, B.A. Callander, N. Harris, A. Kattenberg, and K.
Maskell, eds. Cambridge University Press. Cambridge, U.K.