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Title:
Plume ensembles in rotating convection
Authors:
Legg, Sonya; McWilliams, James; Julien, Keith; Werne, Joseph
Affiliation:
AA(Woods Hole Oceanographic Institution) AB(University of California Los Angeles) AC(University of Colorado) AD(Colorado Research Associates)
Publication:
American Physical Society, Division of Fluid Dynamics Meeting, November 22-24, 1998 Philadelphia, PA, abstract #DI.07
Publication Date:
11/1998
Origin:
APS
Bibliographic Code:
1998APS..DFD..DI07L

Abstract

Geophysical convection often occurs over areas occupied by ensembles of convecting plumes, and may be influenced by rotation when the transit time of plumes is long compared to an inertial period. We examine the behavior of an ensemble of convective plumes, both with and without rotation to identify the influence of rotation on plume transports. Plumes are identified from numerical solutions of turbulent convection by conditionally sampled composites. The dynamical balances of these composite plumes are evaluated and compared with entraining plume models. Non-rotating and rotating plumes show many differences in their transports of mass, buoyancy and momentum. Rotation suppresses expansion of the turbulent plume by entrainment, but through plume-plume interactions enhances mixing between plume and ambient fluid. The resulting dilution of plume buoyancy diminishes the net buoyancy transport at high rotation. Plume acceleration is suppressed at high rotation, in part due to a pressure-gradient deceleration, reducing the net conversion of potential to kinetic energy.

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Database: Astronomy
Physics
arXiv e-prints