Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
8
16
2008
10.5194/acp-8-4759-2008
http://www.atmos-chem-phys.net/8/4759/2008/
http://www.atmos-chem-phys.net/8/4759/2008/acp-8-4759-2008.html
http://www.atmos-chem-phys.net/8/4759/2008/acp-8-4759-2008.pdf
4759
4786
2008-08-19
Validation of ACE-FTS N<sub>2</sub>O measurements
K. Strong
M. A. Wolff
T. E. Kerzenmacher
K. A. Walker
P. F. Bernath
T. Blumenstock
C. Boone
V. Catoire
M. Coffey
M. De Mazière
P. Demoulin
P. Duchatelet
E. Dupuy
J. Hannigan
M. Höpfner
N. Glatthor
D. W. T. Griffith
J. J. Jin
N. Jones
K. Jucks
H. Kuellmann
J. Kuttippurath
A. Lambert
E. Mahieu
J. C. McConnell
J. Mellqvist
S. Mikuteit
D. P. Murtagh
J. Notholt
C. Piccolo
P. Raspollini
M. Ridolfi
C. Robert
M. Schneider
O. Schrems
K. Semeniuk
C. Senten
G. P. Stiller
A. Strandberg
J. Taylor
C. Tétard
M. Toohey
J. Urban
T. Warneke
S. Wood
Department of Physics, University of Toronto, Toronto, Ontario, Canada
Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
Department of Chemistry, University of York, York, UK
Forschungszentrum Karlsruhe and University of Karlsruhe, Institute for Meteorology and Climate Research (IMK), Karlsruhe, Germany
Laboratoire de Physique et Chimie de L'Environment CNRS – Université d'Orléans, Orléans, France
National Center for Atmospheric Research, Boulder, CO, USA
Belgian Institute for Space Aeronomy, Brussels, Belgium
Institute of Astrophysics and Geophysics, University of Liège, Liège, Belgium
School of Chemistry, University of Wollongong, Wollongong, Australia
Department of Earth and Space Science and Engineering, York University, Toronto, Ontario, Canada
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
Institute for Environmental Physics, University of Bremen, Bremen, Germany
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
Department of Radio and Space Science, Chalmers University of Technology, Gothenburg, Sweden
Department of Physics, University of Oxford, Oxford, UK
Institute of Applied Physics "Nello Carrara", National Research Center, Firenze, Italy
Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Bologna, Italy
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
Laboratoire d'Optique Atmosphérique, Université des sciences et technologies de Lille, Villeneuve d'Ascq, France
National Institute of Water and Atmospheric Research Ltd., Lauder, New Zealand
now at: LMD/CNRS Ecole Polytechnique, Palaiseau Cedex, France
The Atmospheric Chemistry Experiment (ACE), also known as SCISAT, was launched
on 12 August 2003, carrying two instruments that measure vertical profiles of
atmospheric constituents using the solar occultation technique. One of these
instruments, the ACE Fourier Transform Spectrometer (ACE-FTS), is measuring volume
mixing ratio (VMR) profiles of nitrous oxide (N<sub>2</sub>O) from the upper troposphere
to the lower mesosphere at a vertical resolution of about 3–4 km. In this study,
the quality of the ACE-FTS version 2.2 N<sub>2</sub>O data is assessed through comparisons
with coincident measurements made by other satellite, balloon-borne, aircraft,
and ground-based instruments. These consist of vertical profile comparisons with
the SMR, MLS, and MIPAS satellite instruments, multiple aircraft flights of ASUR,
and single balloon flights of SPIRALE and FIRS-2, and partial column comparisons
with a network of ground-based Fourier Transform InfraRed spectrometers (FTIRs).
Between 6 and 30 km, the mean absolute differences for the satellite comparisons lie between −42 ppbv and
+17 ppbv, with most within ±20 ppbv. This corresponds to relative deviations
from the mean that are within ±15%, except for comparisons with MIPAS near
30 km, for which they are as large as 22.5%. Between 18 and 30 km, the mean
absolute differences for the satellite comparisons are generally within ±10 ppbv.
From 30 to 60 km, the mean absolute differences are
within ±4 ppbv, and are mostly between −2 and +1 ppbv. Given the small
N<sub>2</sub>O VMR in this region, the relative deviations from the mean are therefore
large at these altitudes, with most suggesting a negative bias in the ACE-FTS
data between 30 and 50 km. In the comparisons with the FTIRs, the mean relative
differences between the ACE-FTS and FTIR partial columns (which cover a mean altitude range of 14 to 27 km)
are within ±5.6% for eleven of the twelve contributing stations. This mean relative difference is
negative at ten stations, suggesting a small negative bias in the ACE-FTS partial
columns over the altitude regions compared. Excellent correlation (<i>R</i>=0.964) is
observed between the ACE-FTS and FTIR partial columns, with a slope of 1.01 and
an intercept of −0.20 on the line fitted to the data.
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