کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1773421 1523564 2012 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Long-term polar motion on a quasi-fluid planetary body with an elastic lithosphere: Semi-analytic solutions of the time-dependent equation
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
Long-term polar motion on a quasi-fluid planetary body with an elastic lithosphere: Semi-analytic solutions of the time-dependent equation
چکیده انگلیسی

In order to understand long-term polar motion (so-called true polar wander), I present a large-scale and time-dependent solution of the Liouville equation based on the quasi-fluid approximation. The formulation includes the stabilizing effect of an oblate fossil shape memorized in an elastic lithosphere. Reorientation is assumed to be driven by a surface mass excess that is axi-symmetric and grows linearly with time. Without a fossil bulge, the time scale of true polar wander (specifically the time scale to settle to an equilibrium state) depends mainly on the time to build the load and its final magnitude. A fossil bulge works against reorientation such that the initial latitude of load emplacement now also influences the time scale. I conclude that it is necessary to consider where a load is emplaced in order to reconstruct paleo-poles on a planetary body with a remnant rotational bulge.


► To demonstrate a large-scale and time-variant solution of long-term polar motion.
► To include the stabilizing effect of an oblate fossil shape in an elastic lithosphere.
► The initial load latitude governs the time scale in a result with a fossil bulge.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 220, Issue 2, August 2012, Pages 449–465
نویسندگان
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