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| Titel |
Constraints on the δ2H diffusion rate in firn from field measurements at Summit, Greenland |
| VerfasserIn |
L. G. Wel, H. A. Been, R. S. W. Wal, C. J. P. P. Smeets, H. A. J. Meijer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 3 ; Nr. 9, no. 3 (2015-05-22), S.1089-1103 |
| Datensatznummer |
250116803
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| Publikation (Nr.) |
 copernicus.org/tc-9-1089-2015.pdf |
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| Zusammenfassung |
We performed detailed 2H isotope diffusion measurements in the upper
3 m of firn at Summit, Greenland. Using a small snow gun, a thin snow
layer was formed from 2H-enriched water over a 6 × 6 m2 area. We
followed the diffusion process, quantified as the increase of the δ2H
diffusion length, over a 4-year period, by retrieving the layer
once per year by drilling a firn core and slicing it into 1 cm layers and
measuring the δ2H signal of these layers.
We compared our experimental findings to calculations based on the model by
Johnsen et al. (2000) and found substantial differences. The
diffusion length in our experiments increased much less over the years than
in the model. We discuss the possible causes for this discrepancy and
conclude that several aspects of the diffusion process in firn are still
poorly constrained, in particular the tortuosity. |
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