Eddy-induced poleward migration of westerly jets in an idealized atmospheric global circulation model

dc.contributor.author Scanlon, Kathleen Elizabeth
dc.date.accessioned 2016-04-13T21:14:57Z
dc.date.available 2016-04-13T21:14:57Z
dc.date.issued 2010-12
dc.description M.S. University of Hawaii at Manoa 2010.
dc.description Includes bibliographical references.
dc.description.abstract This thesis work tests the hypothesis that synoptic eddy and low-frequency flow (SELF) feedback may result in the slow poleward migration of a zonal jet. An atmospheric general circulation model (GCM) was integrated without forcing or dissipation under a basic state in each hemisphere consisting of a single, baroclinically unstable, zonally-uniform jet centered on 30° or 45° latitude. For a wide range of jet speeds, the jet was found to sharpen and jump poleward initially, as the result of the rapid development of synoptic baroclinic eddies due to baroclinic instability. After the end of the initial eddy life cycles, the jet migrated slowly poleward. A preliminary, diagnostic investigation shows that this second type of behavior is consistent with a hypothesis based on the theoretical framework of the SELF feedback (Jin et al. 2006a). Furthermore, the relationship between the speed of poleward propagation and the ratio of eddy momentum fluxes to the background zonal flow is in good agreement with theoretical predictions. The physics involved may also apply to migrating zonalwind anomalies of the type observed in the simulations of more complex GCMs and in nature.
dc.identifier.uri http://hdl.handle.net/10125/101762
dc.language.iso eng
dc.publisher [Honolulu] : [University of Hawaii at Manoa], [December 2010]
dc.relation Theses for the degree of Master of Science (University of Hawaii at Manoa). Meteorology.
dc.subject synoptic eddy
dc.subject low-frequency flow
dc.subject poleward migration
dc.title Eddy-induced poleward migration of westerly jets in an idealized atmospheric global circulation model
dc.type Thesis
dc.type.dcmi Text
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