The surface UV-B irradiation in the Arctic: observations at the Polish polar station, Hornsund /(77°N,15°E), 1996-1997

Details The surface UV-B irradiation in the Arctic: observations at the Polish polar station, Hornsund /(77°N,15°E), 1996-1997 The surface UV-B irradiation in the Arctic: observations at the Polish polar station, Hornsund /(77°N,15°E), 1996-1997

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63..321k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 4, p. 321-329.

Physics

2

Scientific paper

Measurements of the UV-B radiation reaching ground level at the Polish polar station, Hornsund (Svalbard, 77°N, /15°30'E, 11 m a.s.l.), have been carried out since February 1996 by means of a temperature stabilized Robertson-Berger-type meter. The seasonal pattern of UV dose and UV index, and factors affecting the UV-B level there are studied for the period March-October of 1996 and 1997. The quality of the UV measurements is assured by comparisons of the instrument readings with those calculated from a radiative transfer model under clear-sky conditions. A statistical method is proposed to examine the year-to-year drift of the instrument readings. The maximum value of UV daily dose and UV index are found in late spring of 10.2 MED (1MED=210Jeffm-2) and 2.5, respectively. The maximum UV irradiance at the midnight is ≅4mWeffm-2. The seasonal pattern of UV daily dose appears to be asymmetric relative to the summer solstice. All-weather UV measurements taken in early spring provided much higher /(≅50%) UV irradiances than the corresponding measurements in late summer because of larger ground albedo and atmospheric transparency (due to smaller cloud//aerosol optical depth) in early spring. Depletion of total ozone is not the only source of the UV trend over Arctic. It is found that long-term (1965-1997) changes in the cloud cover over southern Svalbard had significant impact on the UV level there.

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