Abstract

Dobson spectrophotometer No. 83 was established in 1962 as a standard for total ozone measurements in the United States. In 1980, the instrument was designated by the World Meteorological Organization as the Primary Standard Dobson spectrophotometer for the world. Since the early 1970’s, instrument No. 83 has been used extensively to calibrate instruments of the global Dobson total ozone station network. Calibrations of the instrument (on the Vigroux (1953) ozone absorption coefficient scale for AD wavelengths) were performed by the Langley slope method (Dobson and Normand, 1962) at Sterling, Virginia, in 1962, and at Mauna Loa, Hawaii in 1972, 1976, 1978,1979, 1980, 1981, 1984, and 1986-1989. Additionally, calibration checks on the instrument have been performed routinely since 1962 with a set of standard lamps Results of the calibrations through 1987 have been described elsewhere in detail (Komhyr et al., 1989).

© 1990 Optical Society of America