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HCFC-133a (CF3CH2Cl): OH rate coefficient, UV and infrared absorption spectra, and atmospheric implications
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2015
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Source: Geophysical Research Letters, 42(14), 6098-6105.
[PDF-845.04 KB]
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Journal Title:Geophysical Research Letters
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Description:HCFC-133a (CF3CH2Cl), an ozone-depleting substance, is primarily removed from the atmosphere by gas-phase reaction with OH radicals and by UV photolysis. The rate coefficient, k, for the OH+HCFC-133a reaction was measured between 233 and 379K and is given by k(T)=(9.320.8)x10(-13)exp(-(1296 +/- 28)/T), where k(296K) was measured to be (1.10 +/- 0.02)x10(-14) (cm(3)molecule(-1)s(-1)) (2 sigma precision uncertainty). The HCFC-133a UV absorption spectrum was measured between 184.95 and 240nm at 213-323K, and a spectrum parameterization is presented. The HCFC-133a atmospheric loss processes, lifetime, ozone depletion potential, and uncertainties were evaluated using a 2-D atmospheric model. The global annually averaged steady state lifetime and ozone depletion potential (ODP) were determined to be 4.45 (4.04-4.90)years and 0.017 (0.001), respectively, where the ranges are based solely on the 2 sigma uncertainty in the kinetic and photochemical parameters. The infrared absorption spectrum of HCFC-133a was measured, and its global warming potential was determined to be 380 on the 100year time horizon.
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Source:Geophysical Research Letters, 42(14), 6098-6105.
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