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| Titel |
Impacts of soil–aquifer heat and water fluxes on simulated global climate |
| VerfasserIn |
N. Y. Krakauer, M. J. Puma, B. I. Cook |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 5 ; Nr. 17, no. 5 (2013-05-23), S.1963-1974 |
| Datensatznummer |
250018882
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| Publikation (Nr.) |
 copernicus.org/hess-17-1963-2013.pdf |
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| Zusammenfassung |
| Climate models have traditionally only represented heat and water fluxes
within relatively shallow soil layers, but there is increasing interest in
the possible role of heat and water exchanges with the deeper subsurface.
Here, we integrate an idealized 50 m deep aquifer into the land surface
module of the GISS ModelE general circulation model to test the influence of
aquifer–soil moisture and heat exchanges on climate variables. We evaluate
the impact on the modeled climate of aquifer–soil heat and water fluxes
separately, as well as in combination. The addition of the aquifer to ModelE
has limited impact on annual-mean climate, with little change in global mean
land temperature, precipitation, or evaporation. The seasonal amplitude of
deep soil temperature is strongly damped by the soil–aquifer heat flux. This
not only improves the model representation of permafrost area but propagates
to the surface, resulting in an increase in the seasonal amplitude of surface
air temperature of > 1 K in the Arctic. The soil–aquifer water and heat
fluxes both slightly decrease interannual variability in soil moisture and in
land-surface temperature, and decrease the soil moisture memory of the land
surface on seasonal to annual timescales. The results of this experiment
suggest that deepening the modeled land surface, compared to modeling only a
shallower soil column with a no-flux bottom boundary condition, has limited
impact on mean climate but does affect seasonality and interannual
persistence. |
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