Article (Scientific journals)
VERTICAL COLUMN ABUNDANCES OF HCN DEDUCED FROM GROUND-BASED INFRARED SOLAR SPECTRA - LONG-TERM TREND AND VARIABILITY
Mahieu, Emmanuel; RINSLAND, C. P.; Zander, Rodolphe et al.
1995In Journal of Atmospheric Chemistry, 20 (3), p. 299-310
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Keywords :
INFRARED SOLAR OBSERVATIONS; hydrogen cyanide; FTIR
Abstract :
[en] A set of high-resolution IR solar spectra recorded at the International Scientific Station of the Jungfraujoch, Switzerland, from 84/06 to 93/06, and at the National Solar Observatory McMath-Pierce solar telescope facility on Kitt Peak, Arizona, U.S.A. from 78/05 to 92/07 have been analyzed to determine the vertical column abundances of hydrogen cyanide, HCN, above the two stations. The analysis was based on least-squares curve fitting of calculated spectra to the observations encompassing the P4 and the P8 lines of HCN respectively located at 3299.5273 and 3287.2483 cm(-1). The results obtained for the two stations indicate that no significant long-term trend affects either of the two databases; however, this analysis reveals variable increases during springtime of up to a factor of 2 in the HCN total column above the Jungfraujoch and even up to 3 above Kitt Peak. The calculated mean vertical column abundances, excluding the spring observations, are equal to (2.55 +/- 0.30) x 10(15) molec./cm(2) (S.D.) and (2.75 +/- 0.30) x 10(15) molec./cm(2) respectively above the Jungfraujoch and the Kitt Peak observatories. Based on a realistic volume mixing ratio profile, these columns translate into mean volume mixing ratios equal to 190 x 10(-12) ppv at the respective altitudes of the stations.
Disciplines :
Earth sciences & physical geography
Environmental sciences & ecology
Author, co-author :
Mahieu, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
RINSLAND, C. P.
Zander, Rodolphe ;  Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
Demoulin, Philippe ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
DELBOUILLE, L.
Roland, Ginette
Language :
English
Title :
VERTICAL COLUMN ABUNDANCES OF HCN DEDUCED FROM GROUND-BASED INFRARED SOLAR SPECTRA - LONG-TERM TREND AND VARIABILITY
Publication date :
March 1995
Journal title :
Journal of Atmospheric Chemistry
ISSN :
0167-7764
eISSN :
1573-0662
Publisher :
Springer Science & Business Media B.V.
Volume :
20
Issue :
3
Pages :
299-310
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 June 2009

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