HCFC-133a (CF3CH2Cl): OH rate coefficient, UV and infrared absorption spectra, and atmospheric implications

Max Mcgillen (1, 2) , François Bernard (1, 2) , Eric Fleming (3) , James B Burkholder (1)

1 ESRL - NOAA Earth System Research Laboratory
2 CIRES - Cooperative Institute for Research in Environmental Sciences
3 GSFC - NASA Goddard Space Flight Center

HCFC-133a (CF 3 CH 2 Cl), 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 379 K and is given by k(T) = (9.32 ± 0.8) × 10 À13 exp(À(1296 ± 28)/T), where k(296 K) was measured to be (1.10 ± 0.02) × 10 À14 (cm 3 molecule À1 s À1) (2σ precision uncertainty). The HCFC-133a UV absorption spectrum was measured between 184.95 and 240 nm at 213-323 K, 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 2σ 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 100 year time horizon.

Domaines: Chimie; Sciences de l'environnement

Max Mcgillen, François Bernard, Eric Fleming, James B Burkholder. HCFC-133a (CF3CH2Cl): OH rate coefficient, UV and infrared absorption spectra, and atmospheric implications. Geophysical Research Letters, 2015, 42 (14), pp.6098-6105. ⟨10.1002/2015GL064939⟩. ⟨hal-02890675⟩