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Numerical Analysis of the First-Order Closure for Synoptic Eddy and Low-Frequency Flow (Self)-Feedback

Title: A Numerical Analysis of the First-Order Closure for Synoptic Eddy and Low-Frequency Flow (Self)-Feedback.
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Name(s): Lin, Lin, author
Jin, Feifei, professor directing thesis
N.Krishnamurti, T., committee member
Ellingson, Robert G., committee member
Department of Earth, Ocean and Atmospheric Sciences, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2005
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The two-way interaction between synoptic eddy and low-frequency flow (SELF), has been recognized to be important for the low-frequency variability of the atmosphere circulation. By considering a stochastic basic flow that captures the observed synoptic eddy statistics, we obtained both first and higher order approximations for a linear closure for the SELF feedback. The validity of the first order approximation depends on the intensity of the eddy variance. The first order approximation breaks down only when the level of eddy variance is unrealistically large. Under observed level of the synoptic eddy variance, I demonstrated that the first-order approximation is largely as good as high order approximations. Direct numerical ensemble simulations of the linearized model with stochastic basic state also confirm the validity of the first order approximation. Moreover, forced solutions under idealized external forcing are analyzed to delineate the importance of the SELF feedback in generating the patterns of low-frequency modes.
Identifier: FSU_migr_etd-1345 (IID)
Submitted Note: A Thesis Submitted to the Department of Meteorology in Partial Fulfillment of the Requirements for the Degree of Master of Science.
Degree Awarded: Summer Semester, 2005.
Date of Defense: April 14, 2005.
Keywords: low-frequency flow, stochastic, synoptic eddy and low-frequency-feedback
Bibliography Note: Includes bibliographical references.
Advisory committee: Feifei Jin, Professor Directing Thesis; T. N.Krishnamurti, Committee Member; Robert G. Ellingson, Committee Member.
Subject(s): Meteorology
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-1345
Owner Institution: FSU

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Lin, L. (2005). A Numerical Analysis of the First-Order Closure for Synoptic Eddy and Low-Frequency Flow (Self)-Feedback. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-1345