Abstract
Column densities of CHF2Cl (HCFC‐22) have been measured over Table Mountain Facility (TMF), Wrightwood, California (34.4°N) using the Atmospheric Trace Molecule Spectroscopy (ATMOS) Fourier‐transform infrared (FTIR) spectrometer. Between October 1985 and July 1990, the exponential column increase rate was (6.7±0.5)% yr−1. Additionally, column measurements of CHF2Cl over McMurdo Sound, Antarctica (78°S) in September and October 1986 by the MarkIV FTIR spectrometer were used to derive a south‐north interhemispheric ratio of (0.86±0.08). Model calculations investigated the feasibility of using CHF2Cl column measurements with a predicted global OH field to determine a globally averaged chemical lifetime for CHF2Cl, or equivalently, an estimate of the OH field using a predicted lifetime. The current uncertainty in historical CHF2Cl emissions is too large for CHF2Cl to be used to infer adequately either the lifetime or the OH field.
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