Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-8-3431-2008
http://www.atmos-chem-phys-discuss.net/8/3431/2008/
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http://www.atmos-chem-phys-discuss.net/8/3431/2008/acpd-8-3431-2008.pdf
3431
3495
2008-02-18
Validation of ACE-FTS v2.2 measurements of HCl, HF, CCl<sub>3</sub>F and CCl<sub>2</sub>F<sub>2</sub> using space-, balloon- and ground-based instrument observations
E. Mahieu
emmanuel.mahieu@ulg.ac.be
P. Duchatelet
P. Demoulin
K. A. Walker
E. Dupuy
L. Froidevaux
C. Randall
V. Catoire
K. Strong
C. D. Boone
P. F. Bernath
J.-F. Blavier
T. Blumenstock
M. Coffey
M. De Mazière
D. Griffith
J. Hannigan
F. Hase
N. Jones
K. W. Jucks
A. Kagawa
Y. Kasai
Y. Mebarki
S. Mikuteit
R. Nassar
J. Notholt
C. P. Rinsland
C. Robert
O. Schrems
C. Senten
D. Smale
J. Taylor
C. Tétard
G. C. Toon
T. Warneke
S. W. Wood
R. Zander
C. Servais
Groupe Infra-Rouge de Physique Atmosphérique et Solaire (GIRPAS), Institute of Astrophysics and Geophysics, University of Liège, Liège, Belgium
Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada
Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
Jet Propulsion Laboratory, California Institute of Technology , Pasadena, CA, USA
University of Colorado, CO, USA
Laboratoire de Physique et Chimie de l'Environnement, CNRS – Université d'Orléans (UMR 6115), 45071 Orléans Cedex 2, France
Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
Institute for Meterorology and Climate Research (IMK), Forschungszentrum Karlsruhe and University of Karlsruhe, Karlsruhe, Germany
National Center for Atmospheric Research, CO, USA
Belgian Institute for Space Aeronomy, Brussels, Belgium
University of Wollongong, Australia
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
National Institute of Communications and Information Technology, 4-2-1 Nukui-kita, Koganei, Tokyo 184-8795, Japan
Harvard University, Cambridge, MA, USA
Institute of Environmental Physics, University of Bremen, Germany
Langley Research Center, VA, USA
Alfred Wegener Insitute for Polar and Marine Research, Bremerhaven, Germany
National Institute of Water and Atmospheric Research Ltd, Lauder, Central Otago, New-Zealand
Laboratoire d'Optique Atmosphérique, Université des sciences et technologies de Lille (UMR 8518) 59655 Villeneuve d'Ascq, France
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 (CCl<sub>3</sub>F) and CFC-12 (CCl<sub>2</sub>F<sub>2</sub>), 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 CFC-12, respectively. For both
reservoirs, comparison results indicate an agreement generally better than
5–10%, 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%.
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