Two versions of an x-y-t, two-layer, numerical model with realistic coastline and bottom topography on a rotated (beta)-plane are used to study the upwelling system off the Peruvian coast. A hydrodynamic version of the model with two homogeneous layers is used to examine the interaction between the bottom topography and coastal trapped waves. / The fluctuations in the undercurrent off the Peruvian coast have been shown (Smith, 1978) to be uncorrelated with the local winds. The hypothesis proposed by Smith is that these fluctuations are the result of coastal trapped Kelvin waves. A parameterization scheme, based on Kelvin wave dynamics is introduced to simulate these coastal trapped waves. The relationship between bottom topographic features and the pycnocline height anomalies for a longshore current event is then examined. The principle of conservation of potential vorticity is used to explain the interactions between the waves and the bottom topography. The results of the hydrodynamic model shows that the interaction between a propagating waves and the bottom topography can play a significant role in determining the location of the centers of enhanced upwelling. / A thermodynamic version of the model, one in which the layer averaged densities are predicted variables, it used to extend the information available from the hydrodynamic models. A parameterization scheme for the interfacial mixing is introduced. There is a twofold reason for introducing thermodynamic and mixing into the model. The first is to include physics normally neglected in upwelling models. The second is to provide a physical mechanism to keep the interface from surfacing. The locations of the centers of enhanced upwelling as indicated by the interface displacement and sea surface temperature are examined and compared to observed data. The results of the thermodynamic model show that a positive heat flux is required to balance the large scale wind induced upwelling in order to observe the centers of enhanced upwelling due to internal waves/bottom topography interaction. / The local wind forcing for both versions of the model are derived from meteorological buoy wind observations. The time series of wind observations from Pacific Marine Environmental Laboratory's (PMEL) PSS-mooring during March, April, May (MAM) 1977 are used to construct the time-dependent amplitudes for the wind function. / Source: Dissertation Abstracts International, Volume: 42-01, Section: B, page: 0121. / Thesis (Ph.D.)--The Florida State University, 1980.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_74398 |
| Contributors | HEBURN, GEORGE WASHINGTON., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 140 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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