Abstract
Calculations of the surface temperature change caused by Freon 22 (CHCIF 2), methyl chloroform (CH 3CCl 3) and methylene chloride (CH 2Cl 2) in the atmosphere were found to be + 0.04, 0.02 and 0.01 K per part per billion by volume (ppbv). This is compared with the calculated temperature increase caused by Freon 11 (CFCl 3) and Freon 12 (CF 2Cl 2) of 0.19 K. ppbv −1. As the current concentration CHClF 2, CH 3CCl 3 and CH 2Cl 2 in the atmosphere are respectively 0.2, 0.1 and 0.1 ppbv, their effect on the surface temperature is insignificant at this time. It was also found that there was no change (< 0.01 K) in the “greenhouse” effect from a doubling of carbon dioxide due to the presence of CFCl 3, CF 2Cl 2, CHClF 2, CH 3CCl 3 and CH 2Cl 2 in concentrations up to 1 ppbv. No examination of any effects of these gases on tropospheric or stratospheric chemistry was made.
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