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Increase in the vertical column abundance of HCFC-22 (CHClF2) above Lauder, New Zealand, between 1985 and 1994

Journal Article


Abstract


  • Total column abundances of CHClF2 (HCFC-22) have been retrieved from high-resolution infrared solar absorption spectra recorded at the Network for the Detection of Stratospheric Change (NDSC) station in Lauder, New Zealand (370 m altitude, 45.04°S latitude, 169.68°E longitude). The analysis, based on nonlinear least squares fittings to the unresolved 2v6 band Q branch of CH35ClF2 at 829.05 cm-1, has been applied to a time series of 670 spectra recorded on 394 days between May 1985 and November 1994. The measurements indicate exponential and linear (referenced to the beginning of 1994) increase rates of (7.5±0.3)% yr-1 and (5.9±0.2)% yr-1, 1σ, corresponding to a doubling of the total column abundance over the 9.5-year measurement period. Of the two models the exponential increase model yields a slightly better fit to the data than the linear model. A HCFC-22 south/north hemispheric ratio of 0.83 ± 0.04, 1σ, is derived by comparing the Lauder column measurements with column measurements from the International Scientific Station of the Jungfraujoch (46.5°N, 8.0°E), after correction for the altitude difference between the two sites. Using a second, independent method in which the N2O column serves as a surrogate air mass, we have used the Lauder measurements and similar measurements from Table Mountain (34.4°N) to calculate a south/north ratio of 0.91 ± 0.10.

Publication Date


  • 1997

Citation


  • Sherlock, V. J., Jones, N. B., Matthews, W. A., Murcray, F. J., Blatherwick, R. D., Murcray, D. G., . . . Griffith, D. W. T. (1997). Increase in the vertical column abundance of HCFC-22 (CHClF2) above Lauder, New Zealand, between 1985 and 1994. Journal of Geophysical Research Atmospheres, 102(7), 8861-8865. doi:10.1029/96jd01012

Scopus Eid


  • 2-s2.0-0031431188

Start Page


  • 8861

End Page


  • 8865

Volume


  • 102

Issue


  • 7

Abstract


  • Total column abundances of CHClF2 (HCFC-22) have been retrieved from high-resolution infrared solar absorption spectra recorded at the Network for the Detection of Stratospheric Change (NDSC) station in Lauder, New Zealand (370 m altitude, 45.04°S latitude, 169.68°E longitude). The analysis, based on nonlinear least squares fittings to the unresolved 2v6 band Q branch of CH35ClF2 at 829.05 cm-1, has been applied to a time series of 670 spectra recorded on 394 days between May 1985 and November 1994. The measurements indicate exponential and linear (referenced to the beginning of 1994) increase rates of (7.5±0.3)% yr-1 and (5.9±0.2)% yr-1, 1σ, corresponding to a doubling of the total column abundance over the 9.5-year measurement period. Of the two models the exponential increase model yields a slightly better fit to the data than the linear model. A HCFC-22 south/north hemispheric ratio of 0.83 ± 0.04, 1σ, is derived by comparing the Lauder column measurements with column measurements from the International Scientific Station of the Jungfraujoch (46.5°N, 8.0°E), after correction for the altitude difference between the two sites. Using a second, independent method in which the N2O column serves as a surrogate air mass, we have used the Lauder measurements and similar measurements from Table Mountain (34.4°N) to calculate a south/north ratio of 0.91 ± 0.10.

Publication Date


  • 1997

Citation


  • Sherlock, V. J., Jones, N. B., Matthews, W. A., Murcray, F. J., Blatherwick, R. D., Murcray, D. G., . . . Griffith, D. W. T. (1997). Increase in the vertical column abundance of HCFC-22 (CHClF2) above Lauder, New Zealand, between 1985 and 1994. Journal of Geophysical Research Atmospheres, 102(7), 8861-8865. doi:10.1029/96jd01012

Scopus Eid


  • 2-s2.0-0031431188

Start Page


  • 8861

End Page


  • 8865

Volume


  • 102

Issue


  • 7