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Ground-based FTIR measurements at Ile de La Réunion: Observations, error analysis and comparisons with satellite data.
Senten, Cindy; De Mazière, Martine; Hermans, Christian et al.
2007In Geophysical Research Abstracts, 9
 

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Keywords :
remote sensing; FTIR spectrometer; greenhouse gases; satellite validation; atmospheric chemistry
Abstract :
[en] Ground-based Fourier-transform infrared (FTIR) 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. Many of these species are essential for the investigation of important atmospheric phenomena, such as the overall greenhouse effect or the stratospheric ozone decrease and recovery. In the frame of the Network for the Detection of Atmospheric Composition Change (NDACC), such observations have been made since many years at several measurement stations for the worldwide long-term monitoring of the atmospheric composition. In this work, we present the results from two short-term FTIR measurement campaigns in 2002 and 2004 at the Ile de La Réunion (21°S, 55°E), a complementary NDACC site in the subtropics, in the Indian Ocean. All spectra were recorded in solar absorption mode. The results discussed here concern the direct greenhouse gases methane (CH4), nitrous oxide (N2O) and ozone (O3), and the indirect greenhouse gases carbon monoxide (CO) and ethane (C2H6), as well as hydrogen cyanide (HCN) and stratospheric hydrogen chloride (HCl), hydrogen fluoride (HF) and nitric acid (HNO3). For the latter species (HCN, HCl, HF and HNO3), we show time series of total column amounts from the surface up to 60 km. For CO, CH4, N2O and O3, it is possible to derive additionally independent information on a few partial columns; these time series are discussed as well. A complete error budget of the retrieval products is given. Temporary mutually correlated enhancements of CO, C2H6and HCN have been observed. They have been traced back to biomass burning events in southern Africa and Madagascar using the FLEXPART model. Comparisons of our retrievals with correlative data from satellite experiments, such as ACE and MOPITT, and with available ozone soundings, show generally good agreements between the different data sets.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Senten, Cindy
De Mazière, Martine
Hermans, Christian
Dils, Bart
Merlaud, A.
Kruglanski, M.
Neefs, E.
Scolas, F.
Vandaele, A. C.
Vigouroux, Corinne
Janssens, K.
Barret, Brice
Carleer, Michel
Coheur, P.-F.
Fally, Sophie
Baray, J. L.
Leveau, J.
Metzger, J. M.
Mahieu, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
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Language :
English
Title :
Ground-based FTIR measurements at Ile de La Réunion: Observations, error analysis and comparisons with satellite data.
Publication date :
2007
Event name :
EGU General Assembly 2007
Event organizer :
European Geosciences Union
Event place :
Vienne, Austria
Event date :
du 15 au 20 avril 2007
Audience :
International
Journal title :
Geophysical Research Abstracts
ISSN :
1029-7006
eISSN :
1607-7962
Publisher :
European Geophysical Society, Katlenburg-Lindau, Germany
Volume :
9
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