NDLI: Effect of the oceanic lithosphere velocity on free convection in the asthenosphere beneath mid-ocean ridges

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Izvestiya, Physics of the Solid Earth : Volume 44, Issue 3, March 2008

Izvestiya, Physics of the Solid Earth : Volume 44, Issue 2, February 2008

Izvestiya, Physics of the Solid Earth : Volume 44, Issue 1, January 2008

Izvestiya, Physics of the Solid Earth : Volume 43

Izvestiya, Physics of the Solid Earth : Volume 42

Effect of the oceanic lithosphere velocity on free convection in the asthenosphere beneath mid-ocean ridges

Content Provider	Springer Nature Link
Author	Kirdyashkin, A. A. Kirdyashkin, A. G.
Copyright Year	2008
Abstract	The paper presents results obtained in experiments on a horizontal layer heated from below in its central part and cooled from above; the layer models the oceanic asthenosphere. Flow velocity and temperature profiles are measured and the flow structure under boundary layer conditions is determined (at Rayleigh numbers Ra > 5 × 10$^{5}$). The flow in the core of a plane horizontal layer heated laterally and cooled from above develops under conditions of a constant temperature gradient averaged over the layer thickness. The flow core is modeled by a horizontal layer with a moving upper boundary and with adiabatic bounding surfaces under conditions of a constant horizontal gradient of temperature. Exact solutions of free convection equations are found for this model in the Boussinesq approximation. Model results are compared with experimental data. Temperature and flow velocity ranges are determined for the boundary layer regime. Based on the experimental flow velocity profiles, an expression is found for the flow velocity profile in a horizontal layer with a mobile upper boundary heated laterally and cooled from above. Free convection velocity profiles are obtained for the asthenosphere beneath a mid-ocean ridge (MOR) with a mobile lithosphere. An expression is obtained for the tangential stress at the top of the asthenosphere beneath an MOR and the total friction force produced by the asthenospheric flow at the asthenosphere-lithosphere boundary is determined.
Starting Page	291
Ending Page	302
Page Count	12
File Format	PDF
ISSN	10693513
Journal	Izvestiya, Physics of the Solid Earth
Volume Number	44
Issue Number	4
e-ISSN	15556506
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-04-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Buoyancy-driven flows; convection Convection currents and mantle plumes Structure of the crust and upper mantle Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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