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dc.contributor.advisorHetland, Robert
dc.creatorQu, Lixin
dc.date.accessioned2019-11-25T21:08:23Z
dc.date.created2019-08
dc.date.issued2019-07-22
dc.date.submittedAugust 2019
dc.identifier.urihttps://hdl.handle.net/1969.1/186420
dc.description.abstractAs two ubiquitous features in open oceans, baroclinic instability vortices and near-inertial waves can coexist in coastal zones under certain conditions and exhibit unique features. This study attempts to improve the fundamental understanding of the submesoscale baroclinic instabilities and near-inertial waves in coastal buoyancy-driven flows. Baroclinic instabilities in coastal buoyancy-driven flows exhibit the self-inhibiting feature (the reduction of the growth rate), which is not revealed in the classical quasi-geostrophic theory. The first part of this study explores the non-geostrophic baroclinic instability theory adapted to the scenario with sloping bathymetry and demonstrates that the suppression of instabilities is related to the Rossby wave resonance. A nondimensional parameter, slope-relative Burger number, is defined for the instability suppression. On the other hand, near-inertial waves in coastal buoyancy-driven flows can be modified by the curved fronts of the instability vortices, which is not revealed in the previous modification theories accounting for straight, jet-like fronts. The second part of this study focuses on the curvature effect of a front on modifying the properties of near-inertial waves. The primary finding is that the waves modified by a baroclinic vortex can be trapped deeper and hence cause deeper mixing than the ones modified by a front without curvature. Furthermore, to better simulate coastal buoyancy-driven flows, the simulation errors caused by temporally subsampling winds are quantified in the last part of this study. The primary finding is that the simulation error is proportional (1:1) to the fraction of the energy missing in the high-frequency wind caused by subsampling. Analyzing the fast Fourier transformation spectrum of a single-point wind measurement in the simulation region is helpful for estimating simulation errors due to temporal resolution.en
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.subjectSubmesoscaleen
dc.subjectNear-inertial waveen
dc.subjectBaroclinic instabilityen
dc.titleSUBMESOSCALE VORTICES AND NEAR-INERTIAL WAVES IN COASTAL BUOYANCY-DRIVEN FLOWen
dc.typeThesisen
thesis.degree.departmentOceanographyen
thesis.degree.disciplineOceanographyen
thesis.degree.grantorTexas A&M Universityen
thesis.degree.nameDoctor of Philosophyen
thesis.degree.levelDoctoralen
dc.contributor.committeeMemberDiMarco, Steven
dc.contributor.committeeMemberLin, Xiaopei
dc.contributor.committeeMemberSocolofsky, Scott
dc.type.materialtexten
dc.date.updated2019-11-25T21:08:23Z
local.embargo.terms2021-08-01
local.embargo.lift2021-08-01
local.etdauthor.orcid0000-0002-2956-8949


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