文章基本信息

标题：Oxygen isotopes in glacier-river water, Austre Okstindbreen, Okstindan, Norway
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作者：Wilfred H. Theakstone
期刊名称：Journal of Glaciology
印刷版ISSN：0022-1430
电子版ISSN：1727-5652
出版年度：2003
卷号：49
期号：165
页码：282-298
DOI：10.3189/172756503781830700
出版社：Cambridge University Press
摘要：There is no discernible river discharge from Austre Okstindbreen, Norway, in winter; any water formed by basal melting is likely to be stored in isolated cavities or sediments at the bed. In summer, a baseflow component of discharge, relatively depleted of 18 O, is diluted by water more enriched in 18 O. Glacier ice meltwater with a high δ 18 O value passes rapidly through channelized systems, and emerges in the glacier river within a few hours. Headward extension of the systems in late summer may tap water stored within the glacier since the previous summer’s close-down. Stored water also is released during early melt-season events, when the low-capacity drainage systems cannot accommodate inputs. The high δ 18 O value indicates that the probable source of the released water is glacier ice or low-altitude snowfall. Stratigraphic variations of δ 18 O values, resulting from changing weather conditions, characterize the accumulating winter snowpack. During the melt season, the mean δ 18 O value of the residual pack rises. The water leaving it, depleted of 18 O, passes slowly through the glacier, smoothing out variations of supply. δ 18 O values of rain vary between and within events, and their effect on glacier-river δ 18 O values is unpredictable.