Paper published in a journal (Scientific congresses and symposiums)
Long-term trend of carbon tetrachloride (CCl4) from ground-based high resolution infrared solar spectra recorded at the Jungfraujoch
Rinsland, Curtis P.; Mahieu, Emmanuel; Demoulin, Philippe et al.
2010In Geophysical Research Abstracts, 12 (EGU2010-1819-3)
 

Files


Full Text
EGU2010-1819-3.pdf
Publisher postprint (49.66 kB)
Abstract
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
greenhouse gas; FTIR spectrometer; Jungfraujoch
Abstract :
[en] The long-term trend of carbon tetrachloride (CCl4) has been retrieved from infrared high resolution solar absorption spectra encompassing the 1999 to 2010 time period. The measurements were recorded with a Fourier transform spectrometer at the northern mid-latitude, high altitude Jungfraujoch station in Switzerland (46.5°N latitude, 8.0°E longitude, 3580 m altitude). Total columns were derived from the region of the strong CCl4 _3 band at 794 cm􀀀1 accounting for all interfering molecules (e.g. H2O, O3) with significant improvement in the residuals obtained by also taking into account the line mixing in a nearby CO2 Q branch, a procedure not implemented in previous remote sensing CCl4 retrievals though its importance has been noted in several papers. The time series shows a statistically-significant long-term decrease in the CCl4 total atmospheric burden of -1.18_0.10 %/yr, at the 95% confidence level, using 2005 as reference. Furthermore, fit to the total column data set also reveals a seasonal cycle with a peak-to-peak amplitude of 10.2%, with minimum and maximum values found in mid-February and early August, respectively. This seasonal modulation can however be attributed to tropopause height changes throughout the season. The results quantify the continued impact of the regulations implemented by the Montreal Protocol and its strengthening amendments and adjustments for a molecule with high global warming potential. Although a statistically significant decrease in the total column is inferred, the CCl4 molecule remains an important contributor to the stratospheric chlorine budget and burden.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Rinsland, Curtis P.;  NASA Langley Research Center
Mahieu, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Demoulin, Philippe ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Zander, Rodolphe ;  Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
Hartmann, Jean-Michel;  Universités Paris VII et Paris XII > Laboratoire Inter-universitaire des Systèmes Atmosphériques > (LISA),UMR CNRS/INSU
Language :
English
Title :
Long-term trend of carbon tetrachloride (CCl4) from ground-based high resolution infrared solar spectra recorded at the Jungfraujoch
Publication date :
2010
Audience :
International
Journal title :
Geophysical Research Abstracts
ISSN :
1029-7006
eISSN :
1607-7962
Publisher :
European Geophysical Society, Katlenburg-Lindau, Germany
Volume :
12
Issue :
EGU2010-1819-3
Available on ORBi :
since 24 February 2010

Statistics


Number of views
104 (6 by ULiège)
Number of downloads
74 (1 by ULiège)

Bibliography


Similar publications



Contact ORBi