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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Extinction of UV radiation in Arctic snow at Alert, Canada (82 degrees N)
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Extinction of UV radiation in Arctic snow at Alert, Canada (82 degrees N)

机译:加拿大阿尔特(82度)的北极雪中紫外线辐射的消光

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Extinction of ultraviolet (UV) and visible radiation (300-548 nm) in snowpack is reported for surface snow used in snow-atmosphere exchange experiments during the Polar Sunrise Experiment ALERT 2000 (Canadian Forces Station Alert, Canada). The UV penetration distance is reported as the e-folding depth (the depth over which the monochromatic light irradiance decreases by a factor of e) for 2 nm wavelength intervals. Values in the range 5-6 cm are obtained for a uniform snowpack in the wavelength region between the ozone absorption edge in the UV and green light in the visible. Experimental evidence shows at most a weak dependence of the asymptotic e-folding depth on the solar zenith angle. Comparison of these data to previous studies indicates that the e-folding depths vary greatly between sites, most probably due to variations in impurities at each of the sites. These data imply that approximately 85% of a photochemical reaction occurs in the top 10 cm of snowpack at this site. [References: 23]
机译:据报道,极地日出实验ALERT 2000(加拿大部队驻地警报,加拿大)在雪-大气交换实验中使用的表面积雪消灭了积雪中紫外线(UV)和可见辐射(300-548 nm)。紫外线穿透距离被报告为2纳米波长间隔的电子折叠深度(单色光辐照度降低的深度,其降低幅度为e)。对于在紫外线中的臭氧吸收边缘和可见光中的绿光之间的波长范围内的均匀雪堆,将获得5-6 cm范围内的值。实验证据表明,渐近电子折叠深度至多与太阳天顶角之间的依赖性很小。这些数据与以前的研究比较表明,电子折叠深度在两个位置之间有很大的不同,这很可能是由于每个位置的杂质变化所致。这些数据表明,大约有85%的光化学反应发生在该地点积雪的顶部10厘米处。 [参考:23]

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