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Water isotopic signature of surface snow metamorphism in Antarctica

Water isotope ratios of ice cores are a key source of information on past temperatures. Through fractionation within the hydrological cycle, temperature is imprinted in the water isotopic composition of snowfalls. However, this signal of climatic interest is modified after deposition when snow remai...

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Hauptverfasser: Casado, Mathieu (VerfasserIn) , Landais, Amaelle (VerfasserIn) , Picard, Ghislain (VerfasserIn) , Arnaud, Laurent (VerfasserIn) , Dreossi, Giuliano (VerfasserIn) , Stenni, Barbara (VerfasserIn) , Prié, Frederic (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 19 August 2021
In: Geophysical research letters
Year: 2021, Jahrgang: 48, Heft: 17, Pages: 1-11
ISSN:1944-8007
DOI:10.1029/2021GL093382
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1029/2021GL093382
Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1029/2021GL093382
Volltext
Verfasserangaben:Mathieu Casado, Amaelle Landais, Ghislain Picard, Laurent Arnaud, Giuliano Dreossi, Barbara Stenni, and Frederic Prié
Beschreibung
Zusammenfassung:Water isotope ratios of ice cores are a key source of information on past temperatures. Through fractionation within the hydrological cycle, temperature is imprinted in the water isotopic composition of snowfalls. However, this signal of climatic interest is modified after deposition when snow remains at the surface exposed to the atmosphere. Comparing time series of surface snow isotopic composition at Dome C with satellite observations of surface snow metamorphism, we found that long summer periods without precipitation favor surface snow metamorphism altering the surface snow isotopic composition. Using excess parameters (combining D,17O, and 18O fractions) allow the identification of this alteration caused by sublimation and condensation of surface hoar. The combined measurement of all three isotopic compositions could help identifying ice core sections influenced by snow metamorphism in sites with very low snow accumulation.
Beschreibung:Gesehen am 26.10.2021
Beschreibung:Online Resource
ISSN:1944-8007
DOI:10.1029/2021GL093382

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