ORBi: Mahieu Emmanuel - Retrieval of methanol (CH3OH) above the high-altitude Jungfraujoch station (46.5ºN): preliminary total column time series, long-term trend and seasonal modulation

Reference : Retrieval of methanol (CH3OH) above the high-altitude Jungfraujoch station (46.5ºN): pre...


	Document type :	Scientific congresses and symposiums : Poster
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/124069

Title :	Retrieval of methanol (CH3OH) above the high-altitude Jungfraujoch station (46.5ºN): preliminary total column time series, long-term trend and seasonal modulation
Language :	English
Author, co-author :	Mahieu, Emmanuel [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
	Bader, Whitney [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
	Bovy, Benoît [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
	Lejeune, Bernard [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
	Vigouroux, Corinne [ > > ]
	Demoulin, Philippe [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
	Servais, Christian [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
	Roland, Ginette [ > > ]
	Zander, Rodolphe [Université de Liège - ULg > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences) >]
Publication date :	Jun-2012
Page number :	A0 - portrait
Peer reviewed :	No
On invitation :	No
Audience :	International
Event name :	InfraRed Working Group Meeting of the Network for the Detection of Atmospheric Composition Change (NDACC)
Event date :	11-15 juin 2012
Event organizer :	C. Servais & E. Mahieu, GIRPAS, University of Liège
Event place (city) :	Wengen
Event country :	Suisse
Keywords :	[en] remote sensing ; atmospheric composition and trends ; infrared spectroscopy ; Jungfraujoch station
Abstract :	[en] Methanol (CH3OH) is a key organic compound in the Earth’s troposphere, with reported concentrations of the order of a few ppbv. It is indeed the second most abundant organic atmospheric compound after methane. Its lifetime is estimated to a few days. Natural sources of CH3OH include plant growth, oceans, decomposition of plant matter, oxidation of methane,… They are complemented by anthropogenic (from vehicles, industry) and biomass burning emissions. Oxidation by the hydroxyl radical is the main sink, leading to the formation of carbon monoxide (CO) and formaldehyde (H2CO). The first reported retrievals of methanol used a microwindow extending from 992 to 999 cm-1 or from 1029 to 1037 cm-1. In both cases, lines of the strong ν8 band of CH3OH were adjusted, accounting for interferences by several isotopologues of ozone and by water vapor. In this contribution, we present first retrievals of CH3OH from observations recorded at the high-altitude station of the Jungfraujoch (46.5°N, 8°E, 3580 m asl), with a Bruker 120HR spectrometer, in the framework of the Network for the Detection of Atmospheric Composition Change (NDACC, visit http://www.ndacc.org). A strategy maximizing the information content and combining the 992-999 and 1029-1037 cm-1 domains has been set up and used. A preliminary long-term CH3OH total column time series derived from the Jungfraujoch observational database allows us to investigate the seasonal variation and long-term trend of this species at northern mid-latitudes.
Funders :	Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Communauté française de Belgique - CfB ; MeteoSwiss
Permalink :	http://hdl.handle.net/2268/124069

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	File	Commentary	Version	Size	Access
Open access	IRWG2012_CH3OH_v2.pdf	Poster A0	Author postprint	26.4 MB	View/Open

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