A numerical study of isotopic evolution of a seasonal snowpack and its meltwater by melting rates

다국어 초록 (Multilingual Abstract)

Understanding an isotopic evolution of a snowpackand its meltwater is crucial for both past and current climate andhydrological studies because the snowmelt is a substantial componentof groundwater and surface runoff in temperate regions. Tobetter understand the isotopic evolution of a snowpack, this studyinvestigated the stable isotopic compositions of a snowpack and itsmelt using a physically-based one-dimensional model with differentmelting rates, which are dependent upon air temperature, amountof short-wave radiation that snow absorbed and aspect differences(north facing vs. south facing). The low melting rate produces amore curved and relatively larger isotopic differences between theearlier and later meltwater. On the other hand, the high meltingrate yields a less curved isotopic trend and a smaller isotopic range.
Low melting rate tends to make the snowpack isotopically heavierin both homogeneous and heterogeneous snowpack. Changes inmelting rate at the surface were accompanied by the changes ofboth percolation velocity of liquid water and contact time betweenliquid water and snow (or ice). Therefore, the differences betweenisotopic values of the snowpack and meltwater decreases as themelting rate increases. Dependence of isotopic evolution of a snowpackand its meltwater on melting rate potentially important forstudying snowmelt hydrology and ice cores for paleoclimate.

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