Henriksen K, Stamnes K, Volden G, Falk E S
Auroral Observatory, University of Tromsø, Norway.
Photodermatol. 1989 Jun;6(3):110-7.
Solar irradiance in the spectral region 280 to 800 nm was measured with a double monochromator at 2 locations in Norway, Tromsø (69.7 degrees N) and Longyearbyen (78.2 degrees N). During the observational (midnight sun) period in Longyearbyen, the maximum UVB irradiance recorded was less than 0.3 W/m2, and no radiation was detected for wavelengths below 300 nm. Such low levels are believed to be a consequence of the low solar elevation angle and the high ozone content of the Arctic ozone layer, which absorbs the incident UV light. With levels between 280 and 350 DU over the period of study, Tromsø and Longyearbyen recorded only one-ninth of the calculated UVB radiation at the equator. There is therefore a considerably higher risk of radiation damage to the skin in equatorial regions (controlling for skin type), a finding that agrees with the statistical evidence for a 7-8 times higher rate of skin cancer in the white population of equatorial countries.
在挪威的两个地点，特罗姆瑟（北纬69.7度）和朗伊尔城（北纬78.2度），使用双单色仪测量了280至800纳米光谱区域的太阳辐照度。在朗伊尔城的观测（极昼）期间，记录到的最大中波紫外线辐照度小于0.3瓦/平方米，且未检测到波长低于300纳米的辐射。据信，如此低的水平是太阳仰角较低以及北极臭氧层臭氧含量较高的结果，后者会吸收入射的紫外线。在研究期间，特罗姆瑟和朗伊尔城的臭氧水平在280至350多布森单位之间，记录到的中波紫外线辐射仅为赤道地区计算值的九分之一。因此，在赤道地区（考虑皮肤类型），皮肤受到辐射损伤的风险要高得多，这一发现与赤道国家白人群体皮肤癌发病率高出7至8倍的统计证据相符。
