Poster (Scientific congresses and symposiums)
Satellite validation of column-averaged methane on global scale: ground-based data from 15 FTIR stations versus last generation ENVISAT/SCIAMACHY retrievals
Sussmann, Ralf; Foster, Frank; Borsdorff, Tobias et al.
2008IGAC 10th International Conference
 

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Abstract :
[en] Previous work has shown that the precision of ground-based mid-infrared (MIR) FTIR spectrometry is sufficient to detect day-to-day variability of columnar methane, while first retrievals from ENVISAT/SCIAMACHY (channel 8) satellite measurements were impacted by a significant time-dependent bias due to detector icing. This prevented insight into true methane temporal variability at that time. The goal of our updated study is to investigate the precision of the last generation (channel 6) SCIAMACHY retrievals IMAP-DOAS v49 and WFM-DOAS v1.0 in comparison to retrievals from ground-based MIR measurements of the European FTIR network. We first briefly discuss the origin and magnitude of the natural variability of columnar methane. Subsequently, our study investigates all factors which can be optimized to improve precision of ground-based MIR-FTIR retrievals of columnar methane. This includes an optimized Tikhonov-type regularization tuned in a way to minimize the diurnal variability of retrieved columnar methane. We also discuss ways to select and average individual-pixel satellite data in order to reflect true day-to-day variability and make them comparable to ground-based data.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Sussmann, Ralf
Foster, Frank
Borsdorff, Tobias
De Mazière, Martine
Dils, Bart
Vigouroux, Corinne
Blumenstock, Thomas
Buchwitz, Michael
Burrows, John
Demoulin, Philippe ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Duchatelet, Pierre ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Frankenberg, Christian
Hannigan, James
Hase, Frank
Jones, Nicholas
Klyft, Jon
Kramer, Isabell
Mahieu, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Mellqvist, Johan
Notholt, Justus
Petersen, Katinka
Schneising, Oliver
Strandberg, Anders
Strong, Kimberly
Taylor, Jeff
Wood, Stephen
More authors (16 more) Less
Language :
English
Title :
Satellite validation of column-averaged methane on global scale: ground-based data from 15 FTIR stations versus last generation ENVISAT/SCIAMACHY retrievals
Publication date :
September 2008
Event name :
IGAC 10th International Conference
Event place :
Annecy, France
Event date :
du 7 au 12 septembre 2008
Audience :
International
Available on ORBi :
since 23 January 2009

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