Volume 18, Issue 12 p. 2269-2272

The relationship between erythemal UV and ozone, derived from spectral irradiance measurements

R. L. McKenzie

R. L. McKenzie

DSIR Physical Sciences, Lauder, Central Otago, New Zealand

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W. A. Matthews

W. A. Matthews

DSIR Physical Sciences, Lauder, Central Otago, New Zealand

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P. V. Johnston

P. V. Johnston

DSIR Physical Sciences, Lauder, Central Otago, New Zealand

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First published: December 1991
Citations: 142

Abstract

Spectral measurements of solar ultraviolet (UV) radiation received at the ground at Lauder, New Zealand (45°S) during 1990 are used in conjunction with ozone total column measurements to investigate the relative importance to erythemally active UV radiation of variations in solar zenith angle, ozone, and cloud cover. At this site solar zenith angle variations are the dominant factor, but clouds frequently attenuate the clear sky irradiances by more than 50%. Ozone reductions of 1% typically cause an increase in erythemally active UV irradiance of 1.25±0.20%.