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On the coupled evolution of oceanic ...

Wagner, Gregory LeClaire.

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On the coupled evolution of oceanic internal waves and quasi-geostrophic flow.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	On the coupled evolution of oceanic internal waves and quasi-geostrophic flow./
作者:	Wagner, Gregory LeClaire.
面頁冊數:	216 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-10(E), Section: B.
Contained By:	Dissertation Abstracts International77-10B(E).
標題:	Physical oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10128416
ISBN:	9781339864280

On the coupled evolution of oceanic internal waves and quasi-geostrophic flow.
Wagner, Gregory LeClaire.

On the coupled evolution of oceanic internal waves and quasi-geostrophic flow. - 216 p.

Source: Dissertation Abstracts International, Volume: 77-10(E), Section: B.

Thesis (Ph.D.)--University of California, San Diego, 2016.

Oceanic motion outside thin boundary layers is primarily a mixture of quasi-geostrophic flow and internal waves with either near-inertial frequencies or the frequency of the semidiurnal lunar tide. This dissertation seeks a deeper understanding of waves and flow through reduced models that isolate their nonlinear and coupled evolution from the Boussinesq equations. Three physical-space models are developed: an equation that describes quasi-geostrophic evolution in an arbitrary and prescribed field of hydrostatic internal waves; a three-component model that couples quasi-geostrophic flow to both near-inertial waves and the near-inertial second harmonic; and a model for the slow evolution of hydrostatic internal tides in quasi-geostrophic flow of near-arbitrary scale. This slow internal tide equation opens the path to a coupled model for the energetic interaction of quasi-geostrophic flow and oceanic internal tides.

ISBN: 9781339864280Subjects--Topical Terms:

3168433
Physical oceanography.

On the coupled evolution of oceanic internal waves and quasi-geostrophic flow.
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245 1 0 $a On the coupled evolution of oceanic internal waves and quasi-geostrophic flow.
300 $a 216 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-10(E), Section: B.
500 $a Adviser: William R. Young.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2016.
520 $a Oceanic motion outside thin boundary layers is primarily a mixture of quasi-geostrophic flow and internal waves with either near-inertial frequencies or the frequency of the semidiurnal lunar tide. This dissertation seeks a deeper understanding of waves and flow through reduced models that isolate their nonlinear and coupled evolution from the Boussinesq equations. Three physical-space models are developed: an equation that describes quasi-geostrophic evolution in an arbitrary and prescribed field of hydrostatic internal waves; a three-component model that couples quasi-geostrophic flow to both near-inertial waves and the near-inertial second harmonic; and a model for the slow evolution of hydrostatic internal tides in quasi-geostrophic flow of near-arbitrary scale. This slow internal tide equation opens the path to a coupled model for the energetic interaction of quasi-geostrophic flow and oceanic internal tides.
520 $a Four results emerge. First, the wave-averaged quasi-geostrophic equation reveals that finite-amplitude waves give rise to a mean flow that advects quasi-geostrophic potential vorticity. Second is the definition of a new material invariant: Available Potential Vorticity, or APV. APV isolates the part of Ertel potential vorticity available for balanced-flow evolution in Eulerian frames and proves necessary in the separating waves and quasi-geostrophic flow. The third result, hashed out for near-inertial waves and quasi-geostrophic flow, is that wave-flow interaction leads to energy exchange even under conditions of weak nonlinearity. For storm-forced oceanic near-inertial waves the interaction often energizes waves at the expense of flow. We call this extraction of balanced quasi-geostrophic energy 'stimulated generation' since it requires externally-forced rather than spontaneously-generated waves. The fourth result is that quasi-geostrophic flow can encourage or 'catalyze' a nonlinear interaction between a near-inertial wave field and its second harmonic that transfers energy to the small near-inertial vertical scales of wave breaking and mixing.
590 $a School code: 0033.
650 4 $a Physical oceanography. $3 3168433
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650 4 $a Applied mathematics. $3 2122814
650 4 $a Geophysical engineering. $3 3175813
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710 2 $a University of California, San Diego. $b Engineering Sciences (Aerospace Engineering). $3 1064527
773 0 $t Dissertation Abstracts International $g 77-10B(E).
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792 $a 2016
793 $a English
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