UV-B over Canada measured by Brewer spectrophotometers and estimated from ozone and pyranometer observations

Vitali E. Fioletov; L. J. Bruce McArthur; James B. Kerr; David I. Wardle

doi:10.1117/12.452950

17 January 2002 UV-B over Canada measured by Brewer spectrophotometers and estimated from ozone and pyranometer observations

Vitali E. Fioletov, L. J. Bruce McArthur, James B. Kerr, David I. Wardle

Author Affiliations +

Proceedings Volume 4482, Ultraviolet Ground- and Space-based Measurements, Models, and Effects; (2002) https://doi.org/10.1117/12.452950
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Routine standard spectral UVB measurements with Brewer spectrophotometers in the Canadian network began in 1989. The time interval of UV measurements militates against reliable detection of long-term changes in UV. To estimate the UV irradiance (at individual wavelengths and spectrally integrated) values prior to 1989 a statistical model has been developed to derive UVB from other variables, which have been measured since the 1960s. These variables include global solar radiation, total ozone, dew point temperature, and snow cover. The model results are demonstrated to be in good agreement with the measurements since 1989. For example, the standard deviations of the difference between monthly values of measured and derived erythemaly weighted UV irradiation is 3.3% for summer months. The major source of error in the model estimates is likely linked to rare occurrences of absorbing aerosols in the atmosphere. Long records of reliable measurements of total ozone, global solar radiation and other parameters made it possible to derive UVB values at three Canadian stations from the mid 1960s. Trends in derived erythemaly weighted UV at two stations (Toronto and Edmonton) are similar to those expected from total ozone trends although the estimated error of the UV trends is more than 2 times larger. However the increase in annual UV at Churchill (59 N) in 1979-1997 was found to be more than twice that expected from the ozone decline. This is a result of long-term changes in snow cover and clouds.

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Vitali E. Fioletov, L. J. Bruce McArthur, James B. Kerr, and David I. Wardle "UV-B over Canada measured by Brewer spectrophotometers and estimated from ozone and pyranometer observations", Proc. SPIE 4482, Ultraviolet Ground- and Space-based Measurements, Models, and Effects, (17 January 2002); https://doi.org/10.1117/12.452950

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KEYWORDS

Ultraviolet radiation

Ozone

Statistical analysis

Solar radiation

Clouds

Data modeling

Solar radiation models

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