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A Study of Stable Isotopic Variations of Antarctic Snow by Albedo Differences

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A Study of Stable Isotopic Variations of Antarctic Snow by Albedo Differences
Other Titles
알베도 변화에 의한 남극 눈 안정동위원소의 변동에 관한 연구
Lee, Jeonghoon
Na, Un-Sung
Ham, Ji-Young
Han, Yeongcheol
isotopic composition of snow; melting rate; snow's albedo; tephra
Issue Date
Lee, Jeonghoon, et al. 2015. "A Study of Stable Isotopic Variations of Antarctic Snow by Albedo Differences". Ocean and Polar Research, 37: 141-147.
Snow albedo can be decreased if there are any impurities on the snow surface other than the snow itself. Due to the decrease of snow albedo, melting rates of surface snow can increase, which is very crucial in climate change and hydrogeology in many parts of the world. Anthropogenic black carbons caused by the incomplete combustion of fossil fuel affect snow and tephra particles generated by geologic volcanic activities reduce snow albedo. In this study, we investigated isotopic compositions for snow covered by tephra particles and compared with this with clean snow. Isotopic compositions of snow with tephra statistically show more enriched than those of clean snow (p < 0.02). This can be explained by the fact that snow becomes enriched in 18O or D relative to meltwater as melting rates are increased. In addition, the slopes of the linear regression between oxygen and hydrogen for snow with tephra and clean snow are 6.7 and 8, respectively, and the latter is similar to that of the global meteoric water line of 8. Therefore, we can conclude that snow impurities control the isotopic compositions of snow, which is very crucial in the study of climate change and hydrogeology. To quantitatively explain these observations, melting experiments and numerical approaches are required.
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