caa a22 4500 477061087 CHVBK 20180405111400.0 cr unu---uuuuu 170330e19960701xx s 000 0 eng 10.1007/BF00210287 doi (NATIONALLICENCE)springer-10.1007/BF00210287 Measurements of stratospheric chlorine monoxide (ClO) from groudbased FTIR observations [Elektronische Daten] [W. Bell, C. Paton-Walsh, T. Gardiner, P. Woods, N. Swann, N. Martin, L. Donohoe, M. Chipperfield] Infrared absorption features due to ClO in the lower stratosphere have been identified from groundbased solar absorption spectra taken from Aberdeen, U.K. (57° N, 2° W) on 20 January 1995. A vertical column abundance of 3.42 (±0.47)×1015 molec cm-2 has been derived from 13 independent absorption features in the P and R branches of the (0-1) vibration-rotation band of 35ClO, spanning the spectral region 817-855 cm-1. The observed absorption features are consistent with very high levels of ClO (approximately 2.6 parts per billion by volume (ppbv)) in the altitude range 16-22 km. A comparison of this profile with a 3D chemical transport model profile indicates the observation was made inside the polar vortex and shows good qualitative agreement but the model underestimates the concentrations of ClO. Simultaneous measurements of other species were made including HCl, HF and ClONO2. These columns yield a value for HCl+ClONO2+ClO of 7.02±0.65×1015 molec cm-2. This is lower than the total inorganic chlorine (ClO y ) column of 10.7±1.6×1015 molec cm-2 estimated from mean measured (HCl+ClONO2)/HF ratios together with in-vortex HF measurements. The discrepancy is probably due to significant amounts of the ClO dimer (Cl2O2) in the lower part of the stratosphere. The measurements of highly elevated levels of ClO are used to estimate O3 loss rates at the 400, 475 and 550 K levels making assumptions about the probable distribution of ClO and Cl2O2. These are compared with loss rates derived from ozone sonde data. Kluwer Academic Publishers, 1996 ClO nationallicence Fourier transform infrared nationallicence Bell W. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K. aut Paton-Walsh C. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K. aut Gardiner T. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K. aut Woods P. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K. aut Swann N. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K. aut Martin N. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K. aut Donohoe L. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K. aut Chipperfield M. Centre for Atmospheric Science, Department of Chemistry, Cambridge University, CB2 1EW, Cambridge, U.K. aut Journal of Atmospheric Chemistry Kluwer Academic Publishers 24/3(1996-07-01), 285-297 0167-7764 24:3<285 1996 24 10874 https://doi.org/10.1007/BF00210287 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00210287 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bell W. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K aut NATIONALLICENCE 700 1- Paton-Walsh C. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K aut NATIONALLICENCE 700 1- Gardiner T. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K aut NATIONALLICENCE 700 1- Woods P. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K aut NATIONALLICENCE 700 1- Swann N. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K aut NATIONALLICENCE 700 1- Martin N. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K aut NATIONALLICENCE 700 1- Donohoe L. Division of Quantum Metrology, National Physical Laboratory, Queens Road, TW11 0LW, Teddington, Middlesex, U.K aut NATIONALLICENCE 700 1- Chipperfield M. Centre for Atmospheric Science, Department of Chemistry, Cambridge University, CB2 1EW, Cambridge, U.K aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers 24/3(1996-07-01), 285-297 0167-7764 24:3<285 1996 24 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer