Stable isotopes in river ice: identifying primary over-winter streamflow signals and their hydrological significance

摘要: The process of isotopic fractionation during freezing in the riverine environment is discussed with reference to a multi-year isotope sampling survey conducted Liard–Mackenzie River Basins, northwestern Canada. Systematic patterns are evident cores congelation ice (black ice) obtained from rivers and numerous tributaries that recognized as primary streamflow signals but offsets close equilibrium ice–water fractionation. results, including comparisons composition fall spring measured directly water samples, suggest shifts ice-on occur due gradual changes fraction flow derived groundwater, surface precipitation sources winter recession. Low signatures predominantly groundwater-fed regime late winter, whereas low ice-off reflect mixed groundwater-, water- precipitation-fed fall. Copyright © 2002 John Wiley & Sons, Ltd.