THE RELATIONSHIP BETWEEN SURFACE-TOPOGRAPHY, GRAVITY-ANOMALIES, AND TEMPERATURE STRUCTURE OF CONVECTION
| Autor: | Stephen F. Daly, Barry Parsons |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Convection
Atmospheric Science Convective heat transfer Soil Science Aquatic Science Oceanography Gravity anomaly Physics::Geophysics Physics::Fluid Dynamics Gravitational field Mantle convection Geochemistry and Petrology Geoid Earth and Planetary Sciences (miscellaneous) Boundary value problem Physics::Atmospheric and Oceanic Physics Earth-Surface Processes Water Science and Technology Ecology Paleontology Forestry Geophysics Boundary layer Space and Planetary Science Geology |
| Popis: | Consideration is given to the relationship between the temperature structure of mantle convection and the resulting surface topography and gravity anomalies, which are used in its investigation. Integral expressions relating the three variables as a function of wavelength are obtained with the use of Green's function solutions to the equations of motion for the case of constant-viscosity convection in a plane layer subject to a uniform gravitational field. The influence of the boundary conditions, particularly at large wavelengths, is pointed out, and surface topographies and gravity produced by convection are illustrated for a number of simple temperature distributions. It is shown that the upper thermal boundary layer plays an important role in determining the surface observables, while temperatures near the bottom of the layer affect mainly that boundary. This result is consistent with an explanation of geoid anomalies over mid-ocean swells in terms of convection beneath the lithosphere. |
| Databáze: | OpenAIRE |
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