Ground-based FTIR spectroscopic absorption measurements of stratospheric trace gases in the Arctic with the sun and the moon as light sources

Notholt, Justus; Schrems, Otto

doi:10.1016/0022-2860(95)08563-b

Cited by 7 publications

(1 citation statement)

References 17 publications

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“…The instrument achieved a maximum OPD of 256 cm corresponding to a spectral resolution of 0.0035 cm À1 [Notholt and Schrems, 1995]. Since that time, measurements have been recorded with a Bruker 120-HR FTS capable of a maximum OPD of 360 cm.…”

Section: Discussionmentioning

confidence: 99%

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

Rinsland

2003

J. Geophys. Res.

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[1] Long-term time series of hydrogen chloride (HCl) and chlorine nitrate (ClONO 2 ) 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 ClONO 2 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 (CCl y ) 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 chlorinebearing source gases. Citation: Rinsland, C. P., et al., Long-term trends of inorganic chlorine from ground-based infrared solar spectra: Past increases and evidence for stabilization,

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Section: Discussionmentioning

confidence: 99%