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| Titel |
Evaluation of the ground surface Enthalpy balance from bedrock temperatures (Livingston Island, Maritime Antarctic) |
| VerfasserIn |
M. Ramos, G. Vieira |
| 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 ; 3, no. 1 ; Nr. 3, no. 1 (2009-05-26), S.133-145 |
| Datensatznummer |
250000791
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| Publikation (Nr.) |
 copernicus.org/tc-3-133-2009.pdf |
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| Zusammenfassung |
| The annual evolution of the ground temperatures from Incinerador borehole in
Livingston Island (South Shetlands, Antarctic) is studied. The borehole is
2.4 m deep and is located in a massive quartzite outcrop with negligible
water content, in the proximity of the Spanish Antarctic Station Juan Carlos
I. In order to model the movement of the 0°C isotherm (velocity and
maximum depth) hourly temperature profiles from: (i) the cooling periods of
the frost season of 2000 to 2005, and (ii) the warming periods of the thaw
season of 2002–2003, 2003–2004 and 2004–2005, were studied. In this modelling
approach, heat gains and losses across the ground surface are assumed to be
the causes for the 0°C isotherm movement. A methodological approach to
calculate the ground Enthalpy change based on the thermodynamic analysis of
the ground during the cooling and warming periods is proposed. The Enthalpy
change into the rock is equivalent to the heat exchange through the ground
surface during each season, thus enabling to describe the interaction
ground-atmosphere and providing valuable data for studies on permafrost and
periglacial processes. The bedrock density and thermal conductivity are
considered to be constant and initial isothermal conditions at 0°C are
assumed (based in collected data and local meteorological conditions in this
area) to run the model in the beginning of each season. The final stages
correspond to the temperatures at the end of the cooling and warming periods
(annual minima and maxima). The application of this method avoids error
propagation induced by the heat exchange calculations from multiple sensors
using the Fourier method. |
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