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Technical Note: New ground-based FTIR measurements at Ile de La Réunion: observations, error analysis, and comparisons with independent data
C. Senten
M. De Mazière
B. Dils
C. Hermans
M. Kruglanski
E. Neefs
F. Scolas
A. C. Vandaele
G. Vanhaelewyn
C. Vigouroux
M. Carleer
P. F. Coheur
S. Fally
B. Barret
J. L. Baray
R. Delmas
J. Leveau
J. M. Metzger
E. Mahieu
C. Boone
K. A. Walker
P. F. Bernath
K. Strong
Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
Service de Chimie Quantique et Photophysique (SCQP), Université Libre de Bruxelles (ULB), Brussels, Belgium
formerly at BIRA-IASB and SCQP/ULB, now at the Institut d'Aérologie, Toulouse, France
Laboratoire de l'Atmosphère et des Cyclones (LACy), Université de La Réunion, France
Institute of Astrophysics and Geophysics, University of Liège, Liège, Belgium
Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
Department of Physics, University of Toronto, Toronto, Ontario, Canada
Department of Chemistry, University of York, Heslington, York, UK
Ground-based high spectral resolution Fourier-transform infrared (FTIR)
solar absorption spectroscopy is a powerful remote sensing technique to
obtain information on the total column abundances and on the vertical
distribution of various constituents in the atmosphere. This work presents
results from two short-term FTIR measurement campaigns in 2002 and 2004,
held at the (sub)tropical site Ile de La Réunion (21°S, 55°E).
These campaigns represent the first FTIR observations carried out at this
site. The results include total column amounts from the surface up to 100 km
of ozone (O<sub>3</sub>), methane (CH<sub>4</sub>), nitrous oxide (N<sub>2</sub>O), carbon
monoxide (CO), ethane (C<sub>2</sub>H<sub>6</sub>), hydrogen chloride (HCl), hydrogen
fluoride (HF) and nitric acid (HNO<sub>3</sub>), as well as some vertical profile
information for the first four mentioned trace gases. The data are
characterised in terms of the vertical information content and associated
error budget. In the 2004 time series, the seasonal increase of the CO concentration was
observed by the end of October, along with a sudden rise that has been
attributed to biomass burning events in southern Africa and Madagascar. This
attribution was based on trajectory modeling. In the same period, other
biomass burning gases such as C<sub>2</sub>H<sub>6</sub> also show an enhancement in
their total column amounts which is highly correlated with the increase of
the CO total columns. The observed total column values for CO are consistent
with correlative data from MOPITT (Measurements Of Pollution In The
Troposphere). Comparisons between our ground-based FTIR observations and space-borne
observations from ACE-FTS (Atmospheric Chemistry Experiment – Fourier
Transform Spectrometer) and HALOE (Halogen Occultation Experiment) confirm
the feasibility of the FTIR measurements at Ile de La Réunion.
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