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• W1976049758 endingPage "16490" @default.
• W1976049758 startingPage "16477" @default.
• W1976049758 abstract "Long‐term trends in the concentrations of SF 6 , CHClF 2 (CFC‐22), and COF 2 in the lower stratosphere have been derived from analysis of ca. 1980 and more recent infrared solar occultation spectra recorded near 32°N latitude at ∼0.02‐Cm −1 resolution. Consistent sets of line parameters and spectral calibration methods have been used in the retrievals to minimize systematic error effects. Quoted error limits are 1 sigma estimated precisions. The SF 6 and CHClF 2 results are based on spectra recorded by balloon‐borne interferometers in March 1981 and June 1988 and a comparison of these results with the Atmospheric Trace Molecule Spectroscopy (ATMOS) Experiment/Spacelab 3 measurements obtained in May 1985 near 30°N latitude. In the 13–18 km altitude range the mean measured SF 6 mixing ratio in parts per trillion by volume (pptv) increased from 1.17±0.21 in March 1981 to 2.02±0.20 pptv in June 1988, and the CHClF 2 mixing ratio below 15 km altitude increased from 51±8 pptv in March 1981 to 102±10 pptv in June 1988. The CHClF 2 retrievals used new empirical CHClF 2 line parameters derived from 0.03‐Cm −1 resolution laboratory spectra recorded at six temperatures between 203 and 293 K; the derived mixing ratios are ∼30% higher than obtained with earlier sets of line parameters, thereby removing a large discrepancy noted previously between IR and in situ measurements of CHClF 2 . Assuming an exponential growth model for fitting the trends, SF 6 and CHClF 2 mean increase rates of 7.4% ±1.9% and 9.4% ±1.3% year −1 , are obtained, respectively, which correspond to cumulative increases by factors of ∼1.7 and ∼2.0 in the concentrations of these gases over the 7.2‐year measurement period. Analysis of spectra recorded in October 1979 and April 1989 yields COF 2 volume mixing ratios that are respectively 0.44±0.17 and 1.21±0.24 times the ATMOS/Spacelab 3 values, from which an average COF 2 increase rate of 10.3±1.8% year −1 over this time period has been estimated. The present results are compared with previously reported observations and trends and with one‐dimensional model calculations. The model calculated trends are in reasonably good agreement with the observations." @default.
• W1976049758 created "2016-06-24" @default.
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• W1976049758 date "1990-09-20" @default.
• W1976049758 modified "2023-09-26" @default.
• W1976049758 title "Long-term trends in the concentrations of SF₆, CHClF₂, and COF₂in the lower stratosphere from analysis of high-resolution infrared solar occultation spectra" @default.
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• W1976049758 doi "https://doi.org/10.1029/jd095id10p16477" @default.
• W1976049758 hasPublicationYear "1990" @default.

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