HCFC‐133a (CF3CH2Cl): OH rate coefficient, UV and infrared absorption spectra, and atmospheric implications. Issue 14 (23rd July 2015)

• Record Type: Journal Article
• Authors: McGillen, Max R.; Bernard, François; Fleming, Eric L.; Burkholder, James B.
• Is Part Of: Geophysical research letters. Volume 42:Issue 14(2015:Jul.)
• Page Start: 6098
• Page End: 6105
• Publication Date: 2015-07-23
• Subjects: ozone‐depleting substance -- photolysis -- hydrochlorofluorocarbon -- UV cross section; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2015GL064939
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: HCFC‐133a (CF3 CH2 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 −13 exp(−(1296 ± 28)/ T ), where k (296 K) was measured to be (1.10 ± 0.02) × 10 −14 (cm 3 molecule −1 s −1 ) (2 σ 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 2 σ 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. Key Points: OH rate coefficient measurements over the range 233 to 379 K UV spectrum measurements resolve existing discrepancies Experimental data and model calculations enable improved ODP and global warming potential estimates