Files in this item



application/pdf9737135.pdf (8MB)Restricted to U of Illinois
(no description provided)PDF


Title:Barotropic Model Simulations of Low-Frequency Variability
Author(s):Huang, Huei-Ping
Doctoral Committee Chair(s):Robinson, Walter A.
Department / Program:Atmospheric Sciences
Discipline:Atmospheric Sciences
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Atmospheric Science
Abstract:Unforced, subcritical nonlinear simulations fail to produce meaningful variability, indicating that forcing is necessary in maintaining the low-frequency variability in the barotropic system under subcritical condition. Stochastically forced experiments are conducted using spatially homogeneous forcing. In the weakly subcritical cases, the model produces spatially and temporally coherent variability, with the first two EOFs of the perturbation field resembling the phase quadrature of the leading normal mode. In this case, the normal mode and retrograde wave structures emerge without normal mode instability. In the strongly subcritical cases, the stochastically forced solutions generally exhibit poor coherence. A stochastically-driven scenario works only in the weakly subcritical regime. The characteristics of the optimal perturbations in the barotropic system are examined. A more general type of spectrally-constrained optimal perturbation is discussed.
Issue Date:1997
Description:178 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.
Other Identifier(s):(MiAaPQ)AAI9737135
Date Available in IDEALS:2015-09-28
Date Deposited:1997

This item appears in the following Collection(s)

Item Statistics