Subglacial topography and geothermal heat flux: Potential interactions with drainage of the Greenland ice sheet

@article{vanderVeen2007SubglacialTA,
  title={Subglacial topography and geothermal heat flux: Potential interactions with drainage of the Greenland ice sheet},
  author={Cornelis J. van der Veen and Timothy E. Leftwich and Ralph R. B. von Frese and Be{\'a}ta M. Csath{\'o} and J. Li},
  journal={Geophysical Research Letters},
  year={2007},
  volume={34}
}
Many of the outlet glaciers in Greenland overlie deep and narrow trenches cut into the bedrock. It is well known that pronounced topography intensifies the geothermal heat flux in deep valleys and attenuates this flux on mountains. Here we investigate the magnitude of this effect for two subglacial trenches in Greenland. Heat flux variations are estimated for idealized geometries using solutions for plane slopes derived by Lachenbruch (1968). It is found that for channels such as the one under… 

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References

SHOWING 1-10 OF 22 REFERENCES

High Geothermal Heat Flow, Basal Melt, and the Origin of Rapid Ice Flow in Central Greenland

TLDR
Age-depth relations from internal layering reveal a large region of rapid basal melting in Greenland, where the southern limit of melt coincides with magnetic anomalies and topography that suggest a volcanic origin.

A numerical model of landform development by glacial erosion

The jagged peaks, knife-edged ridges, and steep-sided valleys of alpine landscapes are well known products of glaciation, yet little is known about how the dynamics of ice flow and glacial erosion

The heat flow through oceanic and continental crust and the heat loss of the Earth

Simple thermal models based on the creation and cooling of the lithosphere can account for the observed subsidence of the ocean floor and the measured decreased in heat flow with age. In

The hot southern continent: heat flow and heat production in Australian Proterozoic terranes

Available surface heat-flow measurements from Australian Proterozoic terranes (83 ′ 18 mWm - 2 ) are significantly higher than the global Proterozoic average of -50 mWm - 2 . Seismic evidence for the

Unusual surface morphology from digital elevation models of the Greenland Ice Sheet

In this study of the North Greenland ice sheet, we have used digital elevation models to investigate the topographic signatures of a large ice flow feature discovered in 1993 and a unique surface

Basal temperature conditions of the Greenland ice sheet during the glacial cycles

A high-resolution, three-dimensional thermomechanical ice-sheet model, which includes isostasy, the possibility of ice-sheet expansion on the continental shelf and refined climatic parameterizations,

Ice-stream-related patterns of ice flow in the interior of northeast Greenland

Ice flow in the interior of the NE quadrant of the Greenland ice sheet is focused on the large ice stream draining the north side of the summit dome. The rapid ice flow in the stream is apparent in

Mechanisms of fast flow in Jakobshavns Isbræ, West Greenland: Part I. Measurements of temperature and water level in deep boreholes

Abstract Several holes were drilled to depths of 1500–1630 m along a profile across Jakobshavns Isbræ, 50 km upstream from the calving front. Drilling was by hot water and required approximately 20

Mechanisms of fast flow in Jakobshavns Isbræ, West Greenland: Part II. Modeling of englacial temperatures

Abstract A model for the calculation of two-dimensional temperature fields is described and applied along the central flowline of Jakobshavns Isbræ, West Greenland, and along a flowline through the

Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations

Abstract From temperature measurements down through the 3001 m deep borehole at the North Greenland Icecore Project (NorthGRIP) drill site, it is now clear that the ice at the base, 3080 m below the