Reference : Observed and simulated time evolution of HCl, ClONO2, and HF total column abundances
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/117940
Observed and simulated time evolution of HCl, ClONO2, and HF total column abundances
English
Kohlhepp, R [> > > >]
Ruhnke, R [> > > >]
Chipperfield, M P [> > > >]
De Mazière, M [> > > >]
Notholt, J [> > > >]
Barthlott, S [> > > >]
Batchelor, R L [> > > >]
Blatherwick, R D [> > > >]
Blumenstock, Th [> > > >]
Coffey, M T [> > > >]
Demoulin, Philippe [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
Fast, H [> > > >]
Feng, W [> > > >]
Goldman, A [> > > >]
Griffith, D W T [> > > >]
Hamann, K [> > > >]
Hannigan, J W [> > > >]
Hase, F [> > > >]
Jones, N B [> > > >]
Kagawa, A [> > > >]
Kaiser, I [> > > >]
Kasai, Y [> > > >]
Kirner, O [> > > >]
Kouker, W [> > > >]
Lindenmaier, R [> > > >]
Mahieu, Emmanuel mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)]
Mittermeier, R L [> > > >]
Monge-Sanz, B [> > > >]
Morino, I [> > > >]
Murata, I [> > > >]
Nakajima, H [> > > >]
Palm, M [> > > >]
Paton-Walsh, C [> > > >]
Raffalski, U [> > > >]
Reddmann, Th [> > > >]
Rettinger, M [> > > >]
Rinsland, C P [> > > >]
Rozanov, E [> > > >]
Schneider, M [ > > ]
Senten, C [> > > >]
Servais, Christian [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
Sinnhuber, B-M [> > > >]
Smale, D [> > > >]
Strong, K [> > > >]
Sussmann, R [> > > >]
Taylor, J R [> > > >]
Vanhaelewyn, G [> > > >]
Warneke, T [> > > >]
Whaley, C [> > > >]
Wiehle, M [> > > >]
Wood, S W [> > > >]
Apr-2012
Atmospheric Chemistry and Physics
Copernicus Publications
12
7
3527--3556
Yes (verified by ORBi)
International
1680-7316
1680-7324
Katlenburg-Lindau
Germany
[en] Montreal Protocol ; FTIR spectroscopy ; stratosphere ; inorganic chlorine ; atmospheric change
[en] Time series of total column abundances of hydrogen
chloride (HCl), chlorine nitrate (ClONO2), and hydrogen
fluoride (HF) were determined from ground-based
Fourier transform infrared (FTIR) spectra recorded at 17
sites belonging to the Network for the Detection of Atmospheric
Composition Change (NDACC) and located between
80.05°N and 77.82°S. By providing such a near-global
overview on ground-based measurements of the two major
stratospheric chlorine reservoir species, HCl and ClONO2,
the present study is able to confirm the decrease of the atmospheric
inorganic chlorine abundance during the last few
years. This decrease is expected following the 1987 Montreal
Protocol and its amendments and adjustments, where
restrictions and a subsequent phase-out of the prominent anthropogenic
chlorine source gases (solvents, chlorofluorocarbons)
were agreed upon to enable a stabilisation and recovery
of the stratospheric ozone layer. The atmospheric fluorine
content is expected to be influenced by the Montreal Protocol,
too, because most of the banned anthropogenic gases
also represent important fluorine sources. But many of the
substitutes to the banned gases also contain fluorine so that
the HF total column abundance is expected to have continued
to increase during the last few years.
The measurements are compared with calculations
from five different models: the two-dimensional Bremen
model, the two chemistry-transport models KASIMA and
SLIMCAT, and the two chemistry-climate models EMAC
and SOCOL. Thereby, the ability of the models to reproduce
the absolute total column amounts, the seasonal cycles,
and the temporal evolution found in the FTIR measurements
is investigated and inter-compared. This is especially interesting
because the models have different architectures. The
overall agreement between the measurements and models for
the total column abundances and the seasonal cycles is good.
Linear trends of HCl, ClONO2, and HF are calculated
from both measurement and model time series data, with a
focus on the time range 2000–2009. This period is chosen
because from most of the measurement sites taking part in
this study, data are available during these years. The precision
of the trends is estimated with the bootstrap resampling
method. The sensitivity of the trend results with respect to
the fitting function, the time of year chosen and time series
length is investigated, as well as a bias due to the irregular
sampling of the measurements.
The measurements and model results investigated here
agree qualitatively on a decrease of the chlorine species by
around 1%yr-1. The models simulate an increase of HF
of around 1%yr-1. This also agrees well with most of the
measurements, but some of the FTIR series in the Northern
Hemisphere show a stabilisation or even a decrease in the
last few years. In general, for all three gases, the measured
trends vary more strongly with latitude and hemisphere than
the modelled trends. Relative to the FTIR measurements, the
models tend to underestimate the decreasing chlorine trends
and to overestimate the fluorine increase in the Northern
Hemisphere.
At most sites, the models simulate a stronger decrease
of ClONO2 than of HCl. In the FTIR measurements, this
difference between the trends of HCl and ClONO2 depends
strongly on latitude, especially in the Northern Hemisphere.
Researchers ; Professionals ; Students ; Others
http://hdl.handle.net/2268/117940
http://www.atmos-chem-phys.net/12/3527/2012/

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