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Long-term trends of inorganic chlorine from ground-based infrared solar spectra: Past increases and evidence for stabilization

Rinsland, CP; Mathieu, E; Zander, R; Jones, NB; Chipperfield, MP; Goldman, A; Anderson, J; Russell, JM; Demoulin, P and Notholt, J, et al. (2003) In Journal of Geophysical Research 108(D8). p.4252-4252
Abstract
Long-term time series of hydrogen chloride (HCl) and chlorine nitrate (ClONO2) total column abundances has been retrieved from high spectral resolution ground-based solar absorption spectra recorded with infrared Fourier transform spectrometers at nine NDSC (Network for the Detection of Stratospheric Change) sites in both Northern and Southern Hemispheres. The data sets span up to 24 years and most extend until the end of 2001. The time series of Cl-y (defined here as the sum of the HCl and ClONO2 columns) from the three locations with the longest time-span records show rapid increases until the early 1990s superimposed on marked day-to-day, seasonal and inter-annual variability. Subsequently, the buildup in Cl-y slows and reaches a broad... (More)
Long-term time series of hydrogen chloride (HCl) and chlorine nitrate (ClONO2) total column abundances has been retrieved from high spectral resolution ground-based solar absorption spectra recorded with infrared Fourier transform spectrometers at nine NDSC (Network for the Detection of Stratospheric Change) sites in both Northern and Southern Hemispheres. The data sets span up to 24 years and most extend until the end of 2001. The time series of Cl-y (defined here as the sum of the HCl and ClONO2 columns) from the three locations with the longest time-span records show rapid increases until the early 1990s superimposed on marked day-to-day, seasonal and inter-annual variability. Subsequently, the buildup in Cl-y slows and reaches a broad plateau after 1996, also characterized by variability. A similar time evolution is also found in the total chlorine concentration at 55 km altitude derived from Halogen Occultation Experiment (HALOE) global observations since 1991. The stabilization of inorganic chlorine observed in both the total columns and at 55 km altitude indicates that the near-global 1993 organic chlorine (CCly) peak at the Earth's surface has now propagated over a broad altitude range in the upper atmosphere, though the time lag is difficult to quantify precisely from the current data sets, due to variability. We compare the three longest measured time series with two-dimensional model calculations extending from 1977 to 2010, based on a halocarbon scenario that assumes past measured trends and a realistic extrapolation into the future. The model predicts broad Cl-y maxima consistent with the long-term observations, followed by a slow Cl-y decline reaching 12-14% relative to the peak by 2010. The data reported here confirm the effectiveness of the Montreal Protocol and its Amendments and Adjustments in progressively phasing out the major man-related perturbations of the stratospheric ozone layer, in particular, the anthropogenic chlorine-bearing source gases. (Less)
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type
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publication status
published
subject
in
Journal of Geophysical Research
volume
108
issue
D8
pages
4252 - 4252
publisher
American Geophysical Union
external identifiers
  • wos:000182843700002
  • scopus:1642497629
ISSN
2156-2202
DOI
10.1029/2002JD003001
language
English
LU publication?
no
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73fb65cb-6196-4f41-8b6a-9ecd52d06495 (old id 3562950)
date added to LUP
2013-03-11 08:12:29
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2018-09-09 03:45:14
@article{73fb65cb-6196-4f41-8b6a-9ecd52d06495,
  abstract     = {Long-term time series of hydrogen chloride (HCl) and chlorine nitrate (ClONO2) total column abundances has been retrieved from high spectral resolution ground-based solar absorption spectra recorded with infrared Fourier transform spectrometers at nine NDSC (Network for the Detection of Stratospheric Change) sites in both Northern and Southern Hemispheres. The data sets span up to 24 years and most extend until the end of 2001. The time series of Cl-y (defined here as the sum of the HCl and ClONO2 columns) from the three locations with the longest time-span records show rapid increases until the early 1990s superimposed on marked day-to-day, seasonal and inter-annual variability. Subsequently, the buildup in Cl-y slows and reaches a broad plateau after 1996, also characterized by variability. A similar time evolution is also found in the total chlorine concentration at 55 km altitude derived from Halogen Occultation Experiment (HALOE) global observations since 1991. The stabilization of inorganic chlorine observed in both the total columns and at 55 km altitude indicates that the near-global 1993 organic chlorine (CCly) peak at the Earth's surface has now propagated over a broad altitude range in the upper atmosphere, though the time lag is difficult to quantify precisely from the current data sets, due to variability. We compare the three longest measured time series with two-dimensional model calculations extending from 1977 to 2010, based on a halocarbon scenario that assumes past measured trends and a realistic extrapolation into the future. The model predicts broad Cl-y maxima consistent with the long-term observations, followed by a slow Cl-y decline reaching 12-14% relative to the peak by 2010. The data reported here confirm the effectiveness of the Montreal Protocol and its Amendments and Adjustments in progressively phasing out the major man-related perturbations of the stratospheric ozone layer, in particular, the anthropogenic chlorine-bearing source gases.},
  author       = {Rinsland, CP and Mathieu, E and Zander, R and Jones, NB and Chipperfield, MP and Goldman, A and Anderson, J and Russell, JM and Demoulin, P and Notholt, J and Toon, GC and Blavier, JF and Sen, B and Sussmann, R and Wood, SW and Meier, Arndt and Griffith, DWT and Chiou, LS and Murcray, FJ and Stephen, TM and Hase, F and Mikuteit, S and Schulz, A and Blumenstock, T},
  issn         = {2156-2202},
  language     = {eng},
  number       = {D8},
  pages        = {4252--4252},
  publisher    = {American Geophysical Union},
  series       = {Journal of Geophysical Research},
  title        = {Long-term trends of inorganic chlorine from ground-based infrared solar spectra: Past increases and evidence for stabilization},
  url          = {http://dx.doi.org/10.1029/2002JD003001},
  volume       = {108},
  year         = {2003},
}