ORBi: Zander Rodolphe - SECULAR EVOLUTION OF THE VERTICAL COLUMN ABUNDANCES OF CHCLF2 (HCFC-22) IN THE EARTH'S ATMOSPHERE INFERRED FROM GROUND-BASED IR SOLAR OBSERVATIONS AT THE JUNGFRAUJOCH AND AT KITT-PEAK, AND COMPARISON WITH MODEL-CALCULATIONS

Reference : SECULAR EVOLUTION OF THE VERTICAL COLUMN ABUNDANCES OF CHCLF2 (HCFC-22) IN THE EARTH'S A...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Environmental sciences & ecology Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/2682

Title :	SECULAR EVOLUTION OF THE VERTICAL COLUMN ABUNDANCES OF CHCLF2 (HCFC-22) IN THE EARTH'S ATMOSPHERE INFERRED FROM GROUND-BASED IR SOLAR OBSERVATIONS AT THE JUNGFRAUJOCH AND AT KITT-PEAK, AND COMPARISON WITH MODEL-CALCULATIONS
Language :	English
Author, co-author :	Zander, Rodolphe [Université de Liège - ULg > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences) >]
	Mahieu, Emmanuel [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
	Demoulin, Philippe [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
	Rinsland, Curtis P. [NASA Langley Research Center (Virginia, USA) >]
	Weisenstein, Debra K. [Atmospheric and Environmental Research Inc. (Cambridge) >]
	Ko, Malcolm K. W. [Atmospheric and Environmental Research Inc. (Cambridge) >]
	Sze, Nien Dak [Atmospheric and Environmental Research Inc. (Cambridge) >]
	Gunson, Michael R. [California Institute of Technology (Pasadena, U.S.A.) > Jet Propulsion Laboratory >]
Publication date :	1994
Journal title :	Journal of Atmospheric Chemistry
Publisher :	Springer Science & Business Media B.V.
Volume :	18
Issue/season :	2
Pages :	129-148
Audience :	International
ISSN :	0167-7764
Keywords :	[en] ATMOSPHERIC COMPOSITION ; INFRARED SOLAR OBSERVATIONS ; CHCLF2 ; greenhouse gas ; Montreal Protocol ; trend ; HCFC22
Abstract :	[en] Series of high-resolution infrared solar spectra recorded at the International Scientific Station of the Jungfraujoch, Switzerland, between 06/1986 and 11/1992, and at Kitt Peak National Observatory, Tucson, Arizona (U.S.A.), from 12/1980 to 04/1992, have been analyzed to provide a comprehensive ensemble of vertical column abundances of CHClF2 (HCFC-22; Freon-22) above the European and the North American continents. The columns were derived from nonlinear least-squares curve fittings between synthetic spectra and the observations containing the unresolved 2nu6 Q-branch absorption of CHClF2 at 829.05 cm-1. The changes versus time observed in these columns were modeled assuming both an exponential and a linear increase with time. The exponential rates of increase at one-sigma uncertainties were found equal to (7.0 +/- 0.35)%/yr for the Junfraujoch data and (7.0 +/- 0.23)%/yr for the Kitt Peak data. The exponential trend of 7.0%/yr found at both stations widely separated in location can be considered as representative of the global increase of the CHClF2 burden in the Earth's atmosphere during the period 1980 to 1992. When assuming two realistic vertical volume mixing ratio profiles for CHClF2 in the troposphere, one quasi constant and the other decreasing by about 13% from the ground to the tropopause, the concentrations for mid-1990 were found to lie between 97 and 111 pptv (parts per trillion by volume) at the 3.58 km altitude of the Jungfraujoch and between .97 and 103 pptv at Kitt Peak, 2.09 km above sea level. Corresponding values derived from calculations using a high vertical resolution-2D model and recently compiled HCFC-22 releases to the atmosphere, were equal to 107 and 105 pptv, respectively, in excellent agreement with the measurements. The model calculated lifetime of CHClF2 was found equal to 15.6 years. The present results are compared critically with similar data found in the literature. On average, the concentrations found here are lower by 15-20% than those derived from in situ investigations; this difference cannot be explained by the absolute uncertainty of +/- 11% assigned presently to the infrared remote measurements.
Permalink :	http://hdl.handle.net/2268/2682
DOI :	10.1007/BF00696811
Other URL :	http://www.springerlink.com/content/t23115x674m82951/?p=249df5fbc08a4a94a5b72931560c1141π=7

File(s) associated to this reference

Fulltext file(s):

	File	Commentary	Version	Size	Access
Restricted access	Zander_HCFC22_JAtmChem_1994.pdf	No commentary	Publisher postprint	1.4 MB	Request copy

All documents in ORBi are protected by a user license.

Dspace v1.5