Terrestrial Heat Flow
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چکیده
منابع مشابه
Terrestrial Heat Flow: Measurement in Lake Bottoms.
The feasibility of measuring terrestrial heat flow in lakes has been investigated in Lake Superior. The temperature gradient and thermal conductivity of the sediment were measured at each of four stations in water depths exceeding 250 meters. Consideration of the effects of climatic variations suggests that they may not seriously affect the values for heat flow obtained by this method. The valu...
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Numerical models of three-dimensional, thermal convection in highly viscous spherical shells with different combinations of internal and basal heating consistently have upwelling concentrations in the form of cylindrical plumes and downwelling in planar sheets. As the proportion of internal heating increases, the number of upwelling plumes increases, and downwelling sheets become more vigorous ...
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During the last few decades, convective flows in systems with free boundaries attract much attention from both fundamental and industrial aspects, especially in microgravity-related science. In the terrestrial environment, buoyancy and thermocapillary forces are coupled to cause convection. In addition the motion of ambient gas is very different in terrestrial and microgravity conditions. Altho...
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Recent 142Nd isotope data indicate that the silicate Earth has an Sm/Nd ratio greater than the supposed chondritic building blocks of the planet. This elevated Sm/Nd has been ascribed either to a “hidden” reservoir in the Earth1,2 or to loss of an early-formed terrestrial crust by impact ablation3. Since removal of crust by ablation would also remove the heat producing elements, K, U and Th, th...
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Because helium and heat production results from a common source, a continental He crustal flux of 4.65*10 14 mol m 2 s 1 has been estimated based on heat flow considerations. In addition, because the observed mantle He /heat flux ratio at the proximity of mid-ocean ridges (6.6*10 14 mol J ) is significantly lower than the radiogenic production ratio (1.5*10 12 mol J ), the presence of a terrest...
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