Evolution into the stagnant lid convection regime with a non‐Newtonian water ice rheology | Zendy

Freeman J. | Zendy; Moresi L. | Zendy; May D. A. | Zendy

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Evolution into the stagnant lid convection regime with a non‐Newtonian water ice rheology

Author(s) -

Freeman J.,

Moresi L.,

May D. A.

Publication year - 2004

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2004gl019798

Subject(s) - rheology , viscosity , nusselt number , thermodynamics , newtonian fluid , convection , mechanics , geology , materials science , physics , turbulence , reynolds number

We study and compare the evolution into the stagnant lid regime with a non‐Newtonian water ice and a silicate rheology by solving the equations of thermal convection. Dislocation creep of water ice is characterized by a larger stress dependence ( n = 4) than silicates ( n = 3) and with this water ice rheology, the stagnant lid regime is attained at a temperature determined viscosity contrast greater than 10 10 and at an effective viscosity contrast of ∼10 5 . We also determine a Nusselt‐Rayleigh number scaling law for the n = 4 rheology.

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