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  • Monthly averaged total ozone values measured at Halley station, Antarctica. All measurements are in Dobson Units. These monthly averages are a flat average of any daily average values that exist for each given month; the daily averages are a flat average of the measurements obtained during a particular 24-hour period (UTC). The number of observations may vary from day to day. The Dobson ozone observing season at Halley begins at the end of August and ends in mid April; however, very early and late season observations are made with the Sun at low elevation, and are less accurate than those made during the main observing period of September 6 to April 6. The values for 1956/57 (MacDowall, J., 1962) and 1957-1973 (Farman, J. C. and Hamilton, R. A., 1975) have been approximately corrected from the original using the WMO recommended guidance (Komhyr, W. D., Mateer C. L. and Hudson, R. D., 1993) for the Bass-Paur ozone absorption coefficients. Ozone values from 1973 onwards have been calculated using the Bass-Paur coefficients. The approximation of a US standard atmosphere, which will differ from the Antarctic atmosphere, has been used and the assumed temperature used for the absorption coefficients may be inaccurate.

  • Total peroxy radical (HO2 and RO2) measurements were made during 2005. This work was carried out at Halley Station, as part of the Chemistry of the Antarctic Boundary Layer and the Interface with Snow (CHABLIS) project (2001-2006).

  • Ozone (O3) and nitric oxide (NO) measurements were made using TEI instruments attached to the roof of the FAGE container. The dataset provides O3 and NO mixing ratios (ppbv) at one minute averaging periods. This work was carried out at Halley Station in 2005 as part of the Chemistry of the Antarctic Boundary Layer and the Interface with Snow (CHABLIS) project (2001-2006).

  • Dataset showing concentrations of nitric acid HNO3 as analysed by ion chromatography. Nitric acid was sampled using the BAS denuder system at the Clean Air Sector Laboratory (CASLab), Halley Station, Antarctica, between March 2004 and March 2006. This dataset is part of the Collection of Meteorological and Atmospheric Chemistry Field Measurements taken during the Chemistry of the Antarctic Boundary Layer and the Interface with Snow (CHABLIS) project.