TABLE 2b.1

CFC's and Miscellaneous other Greenhouse Gases
Atmospheric Concentrations, expressed in ppb (parts per billion)
 CFC's and Miscellaneous Gases Pre-industrial baseline  Natural additions  Anthropogenic additions  Present tropospheric concentrations  Greenhouse Multiplier(1)
 CFC-11 (trichlorofluoromethane) (CCl3F)  0.000000 0.000000  0.262000  0.262000  1320 
 CFC-12 (dichlorodifluoromethane) (CF2Cl2)  0.000000 0.000000  0.533000  0.533000  6650 
 CFC-113 (trichlorotrifluoroethane) (C2F3Cl3)  0.000000 0.000000  0.083000  0.083000  9300 
 carbon tetrachloride (CCl4)  0.000000 0.000000  0.098000  0.098000  -1550 
 methyl chloroform (CH3CCl3)  0.000000 0.000000  0.073000  0.073000  -700 
 HCFC-22 (chlorodifluoromethane) (CHClF2)  0.000000 0.000000  0.118000  0.118000  1350 
 sulphur hexafluoride (SF6)  0.000000 0.000000   0.003500  0.003500  23,900 
 trifluoromethyl sulphur pentafluoride (SF5CF3)  0.000000 0.000000  0.000120  0.000120  20,000 
 perfluoroethane (C2F6)  0.000000 0.000000  0.004000  0.004000  9200 
 surface ozone  25.000000 0.000000  0.500000  0.500000  100 
 Total 25.000000 0.000000  1.674620  26.674620   

 

TABLE 2b.2

CFC's and Miscellaneous other Greenhouse Gases
adjusted for heat retention characteristics, relative to CO2
 CFC'cs and Miscellaneous Gases  Greenhouse Multiplier (1) Pre-industrial baseline Natural additions Anthropogenic additions  Present Tropospheric contribution
 CFC-11 (trichlorofluoromethane) (CCl3F) 1320  0.000000 0.000000  345.84  345.84 
 CFC-12 (dichlorodifluoromethane) (CF2Cl2)  6650  0.000000 0.000000  3,544.45  3,544.45
 CFC-113 (trichlorotrifluoroethane) (C2F3Cl3)  9300  0.000000 0.000000  771.90  771.90 
 carbon tetrachloride (CCl4) -1550  0.000000 0.000000  -151.90  -151.90 
 methyl chloroform (CH3CCl3)  -700   0.000000 0.000000  -51.10  -51.10
 HCFC-22 (chlorodifluoromethane) (CHClF2)  1350  0.000000 0.000000  159.30  159.30 
 sulphur hexafluoride (SF6) 23,900  0.000000 0.000000  83.65 83.65 
 trifluoromethyl sulphur pentafluoride (SF5CF3)  20,000  0.000000 0.000000  2.40   2.40 
 perfluoroethane (C2F6)  9200  0.000000 0.000000  36.80  36.80
 surface ozone  100  2500.0000 0.000000  50.00  2,550.00 
 Total 2861.15 / 273.34  2500.0000 0.000000  4,791.34 7,291.34 

|| Greenhouse Data ||

(1) Multipliers for the various gases from:
Warming Potentials of Halocarbons and Greenhouses Gases
Chemical formulae and global warming potentials from Intergovernmental Panel on Climate Change, Climate Change 1995: The Science of Climate Change (Cambridge, UK: Cambridge University Press, 1996), pp. 119 and 121. Production and sales of CFCs and other chemicals from International Trade Commission, Synthetic Organic Chemicals: United States Production and Sales, 1994 (Washington, DC, 1995). TRI emissions from U.S. Environmental Protection Agency, 1994 Toxics Release Inventory: Public Data Release, EPA-745-R-94-001 (Washington, DC, June 1996), p. 73. Estimated 1994 U.S. emissions from U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks, 1990-1994, EPA-230-R-96-006 (Washington, DC, November 1995), pp. 37-40.

Global Climate Greenhouse gas page (updated June 26, 2001)
National Energy Technology Laboratory; U.S. Department of Energy

A Paleo Perspective on Global Warming
National Oceanographic and Atmospheric Abministration- National Geophysical Center

Note: trifluoromethyl sulphur pentafluoride (SF5CF3) and ozone anthropogenic contributions are "guesstimated" as data is unavailable.

 

|| Global Warming || Monte Hieb's website || Serendipity home page ||