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| Titel |
Three-phase numerical model for subsurface hydrology in permafrost-affected regions (PFLOTRAN-ICE v1.0) |
| VerfasserIn |
S. Karra, S. L. Painter, P. C. Lichtner |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2014-10-23), S.1935-1950 |
| Datensatznummer |
250116329
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| Publikation (Nr.) |
 copernicus.org/tc-8-1935-2014.pdf |
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| Zusammenfassung |
| Degradation of near-surface permafrost due to changes in the climate is
expected to impact the hydrological, ecological and biogeochemical responses
of the Arctic tundra. From a hydrological perspective, it is important to
understand the movement of the various phases of water (gas, liquid and ice)
during the freezing and thawing of near-surface soils. We present a new
non-isothermal, single-component (water), three-phase formulation that
treats air as an inactive component. This single component model works well
and produces similar results to a more complete and computationally demanding
two-component (air, water) formulation, and is able to reproduce results of
previously published laboratory experiments. A proof-of-concept
implementation in the massively parallel subsurface flow and reactive transport
code PFLOTRAN is summarized, and parallel performance of that implementation
is demonstrated. When water vapor diffusion is considered, a large effect on
soil moisture dynamics is seen, which is due to dependence of thermal
conductivity on ice content. A large three-dimensional simulation
(with around 6 million degrees of freedom) of seasonal freezing and thawing is
also presented. |
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