Article (Scientific journals)
Analysis of stratospheric NO2 trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations
Hendrick, F; Mahieu, Emmanuel; Bodeker, G E et al.
2012In Atmospheric Chemistry and Physics, 12, p. 8851-8864
Peer Reviewed verified by ORBi
 

Files


Full Text
acp-12-8851-2012.pdf
Publisher postprint (894.67 kB)
Final ACP paper
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Jungfraujoch station; trend analysis; stratospheric composition; remote sensing
Abstract :
[en] The trend in stratospheric NO2 column at the NDACC (Network for the Detection of Atmospheric Composition Change) station of Jungfraujoch (46.5°N, 8.0°E) is assessed using ground-based FTIR and zenith-scattered visible sunlight SAOZ measurements over the period 1990 to 2009 as well as a composite satellite nadir data set constructed from ERS-2/GOME, ENVISAT/SCIAMACHY, and METOP-A/GOME-2 observations over the 1996–2009 period. To calculate the trends, a linear least squares regression model including explanatory variables for a linear trend, the mean annual cycle, the quasi-biennial oscillation (QBO), solar activity, and stratospheric aerosol loading is used. For the 1990–2009 period, statistically indistinguishable trends of -3.7±1.1%/decade and -3.6±0.9%/decade are derived for the SAOZ and FTIR NO2 column time series, respectively. SAOZ, FTIR, and satellite nadir data sets show a similar decrease over the 1996–2009 period, with trends of -2.4±1.1%/decade, -4.3±1.4%/decade, and -3.6±2.2%/decade, respectively. The fact that these declines are opposite in sign to the globally observed +2.5%/decade trend in N2O, suggests that factors other than N2O are driving the evolution of stratospheric NO2 at northern mid-latitudes. Possible causes of the decrease in stratospheric NO2 columns have been investigated. The most likely cause is a change in the NO2/NO partitioning in favor of NO, due to a possible stratospheric cooling and a decrease in stratospheric chlorine content, the latter being further confirmed by the negative trend in the ClONO2 column derived from FTIR observations at Jungfraujoch. Decreasing ClO concentrations slows the NO+ ClO -> NO2 + Cl reaction and a stratospheric cooling slows the NO+O3 -> NO2 +O2 reaction, leaving more NOx in the form of NO. The slightly positive trends in ozone estimated from ground- and satellitebased data sets are also consistent with the decrease of NO2 through the NO2 +O3 -> NO3 +O2 reaction. Finally, we cannot rule out the possibility that a strengthening of the Dobson-Brewer circulation, which reduces the time available for N2O photolysis in the stratosphere, could also contribute to the observed decline in stratospheric NO2 above Jungfraujoch.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Hendrick, F
Mahieu, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Bodeker, G E
Boersma, K F
Chipperfield, M P
De Mazière, M
De Smedt, I
Demoulin, Philippe ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Fayt, C
Hermans, C
Kreher, K
Lejeune, Bernard ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Pinardi, G
Servais, Christian ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Stübi, R
van der A, R
Vernier, J-P
Van Roozendael, M
More authors (8 more) Less
Language :
English
Title :
Analysis of stratospheric NO2 trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations
Publication date :
28 September 2012
Journal title :
Atmospheric Chemistry and Physics
ISSN :
1680-7316
eISSN :
1680-7324
Publisher :
Copernicus Publications, Katlenburg-Lindau, Germany
Volume :
12
Pages :
8851-8864
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 284421 - NORS - Demonstration Network Of ground-based Remote Sensing Observations in support of the GMES Atmospheric Service
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
FWB - Fédération Wallonie-Bruxelles [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
CE - Commission Européenne [BE]
Available on ORBi :
since 15 May 2012

Statistics


Number of views
175 (23 by ULiège)
Number of downloads
80 (6 by ULiège)

Scopus citations®
 
22
Scopus citations®
without self-citations
17
OpenCitations
 
22

Bibliography


Similar publications



Contact ORBi