Experimental observation of transient δ18O interaction between snow and advective airflow under various temperature gradient conditions
Stable water isotopes (δ18O) obtained from snow and ice samples of polar regions are used to reconstruct past climate variability, but heat and mass transport processes can affect the isotopic composition. Here we present an experimental study on the effect on the snow isotopic composition by airflo...
| Main Authors: | , , , , |
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| Format: | Report |
| Language: | English |
| Published: |
Copernicus
2017
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| Subjects: | |
| Online Access: | https://hdl.handle.net/20.500.11850/164960 https://doi.org/10.3929/ethz-b-000164960 |
| Summary: | Stable water isotopes (δ18O) obtained from snow and ice samples of polar regions are used to reconstruct past climate variability, but heat and mass transport processes can affect the isotopic composition. Here we present an experimental study on the effect on the snow isotopic composition by airflow through a snow pack in controlled laboratory conditions. The influence of isothermal and controlled temperature gradient conditions on the δ18O content in the snow and interstitial water vapor is elucidated. The observed disequilibrium between snow and vapor isotopes led to exchange of isotopes between snow and vapor under non-equilibrium processes, significantly changing the δ18O content of the snow. The type of metamorphism of the snow had a significant influence on this process. These findings are pertinent to the interpretation of the records of stable isotopes of water from ice cores. These laboratory measurements suggest that a highly resolved history is relevant for the interpretation of the snow isotopic composition in the field. ISSN:1994-0432 ISSN:1994-0440 |
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