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• W4230285655 abstract "Abstract. It is now known that Single-monochromator Brewer Spectrophotometer ozone and sulphur dioxide measurements suffer from non-linearity at large ozone slant column amounts due to the presence of instrumental stray light caused by scattering within the optics of the instrument. Because of the large gradient in the ozone absorption spectrum in the near-ultraviolet, the atmospheric spectra measured by the instrument possess a very large gradient in intensity in the 300 to 325 nm wavelength region. This results in a significant sensitivity to stray light when there is more than 1000 Dobson Units (DU) of ozone in the light path. As the light path (airmass) through ozone increases, the stray light effect on the measurements also increases. The measurements can be on the order of 10 % low for an ozone column of 600 DU and an airmass factor of 3 (1800 DU slant column amount) causing an underestimation of the ozone column. Primary calibrations for the Brewer instrument are carried out at Mauna Loa Observatory in Hawaii. They are done using the Langley plot method to extrapolate a set of measurements made under a constant ozone amount to an extraterrestrial calibration constant. Since the effects of a small non-linearity at lower ozone paths may still be important, a better calibration procedure should account for the non-linearity of the instrument response. Studies involving the scanning of a laser source have been used to characterize the stray light response of the Brewer, but until recently these data have not been used to elucidate the relationship between the stray light response and the ozone measurement non-linearity. This paper presents a simple and practical method of correcting for the effects of stray light that includes a mathematical model of the instrument response and a non-linear retrieval approach that calculates the best values for the model parameters. The model can then be used in reverse to provide more accurate ozone values up to a defined maximum ozone slant path. The parameterization used was validated using an instrument physical model simulation." @default.
• W4230285655 created "2022-05-11" @default.
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• W4230285655 date "2018-07-17" @default.
• W4230285655 modified "2023-09-29" @default.
• W4230285655 title "A Calibration Procedure Which Accounts for Non-linearity in Single-monochromator Brewer Ozone Spectrophotometer Measurements" @default.
• W4230285655 doi "https://doi.org/10.5194/amt-2018-157" @default.
• W4230285655 hasPublicationYear "2018" @default.
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