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| Titel |
Physical properties of rocks from a 15 m deep borehole in Reina Sofia Mountain, Livingston Island, Maritime Antarctica |
| VerfasserIn |
Paulo Maciel Amaral, Antonio Correia, Gonçalo Vieira, Miguel Ramos, Alexandre Trindade |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052432
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| Zusammenfassung |
| In permafrost environments, such as the Shetland Islands of Maritime Antarctica, the thermal
conductivity and the thermal diffusivity of the uppermost ground are two very important
properties to understand time and space evolution of temperature as well as freezing and
thawing.
In order to estimate the heat flow density (which depends on the local thermal
conductivity of the rocks and the local geothermal gradient), the time evolution of
permafrost in the Reina Sofia Mountain in Livingston Island, Maritime Antarctica, cores
from a 15 m deep borehole were collected for measurement of physical properties
such as thermal conductivity, thermal diffusivity, and porosity. The values from
thermal conductivity and thermal diffusivity were obtain on TCS Lippmann & Rauen
GbR by transiet methods, the values from porosity were obtain by water saturation
techniques.
The values of thermal conductivity dry cores vary between 3.02W/m.K and 3.32
W/m.K; the values of the thermal diffusivity vary between 1.42 x 10-6 m2s-1and
1.64x 10-6 m2s-1; the average heat production for the entire borehole is 1.698
μWm-3. Because thermal properties of rocks are highly dependent on porosity, this
parameter was also measured, in the cores giving values that vary between 1.1% and
1.8%.
These new data will allow estimating for the first time the heat flow density for the area
near the Reina Sofia Mountain. |
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