Validation of ACE-FTS v2.2 measurements of HCl, HF, CCl3F and CCl2F2 using space-, balloon- and ground-based instrument observations E. Mahieu1, P. Duchatelet1, P. Demoulin1, K. A. Walker2,3, E. Dupuy3, L. Froidevaux4, C. Randall5, V. Catoire6, K. Strong2, C. D. Boone3, P. F. Bernath7, J.-F. Blavier4, T. Blumenstock8, M. Coffey9, M. De Mazière10, D. Griffith11, J. Hannigan9, F. Hase8, N. Jones11, K. W. Jucks12, A. Kagawa13, Y. Kasai13, Y. Mebarki6, S. Mikuteit8, R. Nassar14, J. Notholt15, C. P. Rinsland16, C. Robert6, O. Schrems17, C. Senten10, D. Smale18, J. Taylor2, C. Tétard19, G. C. Toon4, T. Warneke15, S. W. Wood18, R. Zander1, and C. Servais1 1Groupe Infra-Rouge de Physique Atmosphérique et Solaire (GIRPAS), Institute of Astrophysics and Geophysics, University of Liège, Liège, Belgium 2Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada 3Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada 4Jet Propulsion Laboratory, California Institute of Technology , Pasadena, CA, USA 5University of Colorado, CO, USA 6Lab. de Physique et Chimie de l'Environnement, CNRS – Univ. d'Orléans (UMR 6115), 45071 Orléans Cedex 2, France 7Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK 8Institute for Meterorology and Climate Research (IMK), Forschungszentrum Karlsruhe and University of Karlsruhe, Karlsruhe, Germany 9National Center for Atmospheric Research, CO, USA 10Belgian Institute for Space Aeronomy, Brussels, Belgium 11University of Wollongong, Australia 12Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA 13National Institute of Communications and Information Technology, 4-2-1 Nukui-kita, Koganei, Tokyo 184-8795, Japan 14Harvard University, Cambridge, MA, USA 15Institute of Environmental Physics, University of Bremen, Germany 16Langley Research Center, VA, USA 17Alfred Wegener Insitute for Polar and Marine Research, Bremerhaven, Germany 18National Institute of Water and Atmospheric Research Ltd, Lauder,Central Otago, New Zealand 19Laboratoire d'Optique Atmosphérique, Université des sciences et technologies de Lille (UMR 8518), 59655 Villeneuve d'Ascq, France
Abstract. Hydrogen chloride (HCl) and hydrogen fluoride (HF) are respectively the main
chlorine and fluorine reservoirs in the Earth's stratosphere. Their buildup
resulted from the intensive use of man-made halogenated source gases, in
particular CFC-11 (CCl3F) and CFC-12 (CCl2F2), during the
second half of the 20th century. It is important to continue monitoring
the evolution of these source gases and reservoirs, in support of the
Montreal Protocol and also indirectly of the Kyoto Protocol. The Atmospheric
Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) is a
space-based instrument that has been performing regular solar occultation
measurements of over 30 atmospheric gases since early 2004. In this
validation paper, the HCl, HF, CFC-11 and CFC-12 version 2.2 profile data
products retrieved from ACE-FTS measurements are evaluated. Volume mixing
ratio profiles have been compared to observations made from space by MLS and
HALOE, and from stratospheric balloons by SPIRALE, FIRS-2 and Mark-IV.
Partial columns derived from the ACE-FTS data were also compared to column
measurements from ground-based Fourier transform instruments operated at 12
sites. ACE-FTS data recorded from March 2004 to August 2007 have been used
for the comparisons. These data are representative of a variety of
atmospheric and chemical situations, with sounded air masses extending from
the winter vortex to summer sub-tropical conditions. Typically, the ACE-FTS
products are available in the 10–50 km altitude range for HCl and HF, and in
the 7–20 and 7–25 km ranges for CFC-11 and -12, respectively. For both
reservoirs, comparison results indicate an agreement generally better than
5–10% above 20 km altitude, when accounting for the known offset
affecting HALOE measurements of HCl and HF. Larger positive differences are
however found for comparisons with single profiles from FIRS-2 and SPIRALE.
For CFCs, the few coincident measurements available suggest that the
differences probably remain within ±20%.
Citation: Mahieu, E., Duchatelet, P., Demoulin, P., Walker, K. A., Dupuy, E., Froidevaux, L., Randall, C., Catoire, V., Strong, K., Boone, C. D., Bernath, P. F., Blavier, J.-F., Blumenstock, T., Coffey, M., De Mazière, M., Griffith, D., Hannigan, J., Hase, F., Jones, N., Jucks, K. W., Kagawa, A., Kasai, Y., Mebarki, Y., Mikuteit, S., Nassar, R., Notholt, J., Rinsland, C. P., Robert, C., Schrems, O., Senten, C., Smale, D., Taylor, J., Tétard, C., Toon, G. C., Warneke, T., Wood, S. W., Zander, R., and Servais, C.: Validation of ACE-FTS v2.2 measurements of HCl, HF, CCl3F and CCl2F2 using space-, balloon- and ground-based instrument observations, Atmos. Chem. Phys., 8, 6199-6221, doi:10.5194/acp-8-6199-2008, 2008.