Observational studies of low-frequency oscillations in the Southern Hemisphere

dc.contributor.advisor John L. Stanford
dc.contributor.author Graves, Charles
dc.contributor.department Physics and Astronomy
dc.date 2018-08-15T04:10:58.000
dc.date.accessioned 2020-07-02T06:09:34Z
dc.date.available 2020-07-02T06:09:34Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 1988
dc.date.issued 1988
dc.description.abstract <p>This work examines 40-50 day fluctuations in the Southern Hemisphere middle and high latitudes. The existence of these fluctuations are established in rawinsonde data at Easter Island (27°S, 109°W) and in global geopotential heights fields. These fluctuations behave as quasi-stationary wavetrains that propagate energy along an elliptical path from low latitudes in the Indian Ocean to the coast of Antarctica, near 70°W. The wavetrains exhibit vertical phase tilts from the surface to about 500 mb; above that, they are vertically in phase. However, the wavetrains are not observed in the middle and upper stratosphere. Over the Indian Ocean, there is also evidence suggesting that the wavetrains interact with the tropical 40-50 day oscillation. In addition, the extratropical 40-50 day fluctuations extract energy from the mean zonal flow through baroclinic processes but lose energy to the mean zonal flow through barotropic processes;The results revealed here increase the understanding of the global 40-50 day phenomena and may provide an important effect in the evolution of the tropical 40-50 day oscillation.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/8847/
dc.identifier.articleid 9846
dc.identifier.contextkey 6344125
dc.identifier.doi https://doi.org/10.31274/rtd-180813-12211
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/8847
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/81880
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/8847/r_8909148.pdf|||Sat Jan 15 02:17:53 UTC 2022
dc.subject.disciplines Atmospheric Sciences
dc.subject.keywords Physics
dc.title Observational studies of low-frequency oscillations in the Southern Hemisphere
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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