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- W181693395 abstract "Stable water isotope ratios ( 18 O and D) in snow pit (Juneau Icefield) and fresh snow (Eclipse Icefield) samples are included in a compilation of all available snow isotope data from coastal Alaska, and used to evaluate observed isotope shifts in regional paleoclimate records. I compiled existing isotope data in coastal Alaska (primarily the Saint Elias Range) in order to better understand the elevation dependence of stable atmospheric water isotope ratios in the region. The values that make up the compilation are reflective of multiple fractionation regimes associated with synoptic scale cyclonic events, described using the Cyclone-Water Isotope Model (Holdsworth and Krouse 2002). Using this Cyclone-Water Isotope Model as a link between high frequency spatial and temporal variability, fresh snow data characterizing five different events within a 17 day time span from the Eclipse Icefield were analyzed for δ 18 O values. Average isotope values among these five events vary by as much as 8‰. Meteorological conditions over the domain are investigated with NCEP Climate Forecast System Reanalysis (CFSR), and show that events with more depleted δ 18 O are associated with systems that have higher pressure and a zonal (northern) moisture source, whereas events with less depleted δ 18 O are related to events with lower pressure and a more significant component of southern moisture. These observations of event-based meteorological controls on δ 18 O variability shed light on paleoclimate interpretations of shifts in the isotopic record seen in the Mount Logan ice core and Jellybean Lake sediment core at around A.D. 800 and A.D. 1840. The findings in the paper support Fields et al. (2010) in the interpretation that the shift to lower δ 18 O values seen in the isotopic record is caused by a transition to a more zonal (northern) moisture source paradigm." @default.
- W181693395 created "2016-06-24" @default.
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- W181693395 date "2013-01-01" @default.
- W181693395 modified "2023-09-24" @default.
- W181693395 title "Investigating the Controls on Surface Snow δ18O Values in the Coastal Northeast Pacific: Implications for Paleoclimate Interpretations" @default.
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