Surgencias costeras y remolinos subsuperficiales en la parte sur de la Corriente de California
Coastal upwelling and subsurface eddies phenomena that occur in the southern part of the California are investigated using shipboard observations and realistic numerical simulations. During October 2009, both phenomena occurred simultaneously. The use of the quasigeostrophic theory led the finding o...
| Autor: | |
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | México |
| Institución: | Centro de Investigación Científica y de Educación Superior de Ensenada |
| Repositorio: | Repositorio Institucional CICESE |
| Idioma: | español |
| OAI Identifier: | oai:cicese.repositorioinstitucional.mx:1007/287 |
| Acceso en línea: | http://cicese.repositorioinstitucional.mx/jspui/handle/1007/287 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/Autor/Remolinos subsuperficiales, info:eu-repo/classification/Autor/Corriente de California info:eu-repo/classification/Autor/Circulación ageostrófica info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/25 |
| Sumario: | Coastal upwelling and subsurface eddies phenomena that occur in the southern part of the California are investigated using shipboard observations and realistic numerical simulations. During October 2009, both phenomena occurred simultaneously. The use of the quasigeostrophic theory led the finding of a cross-shore ageostrophic circulation during an upwelling event, not only in the upwelling front, but also near the continental shelf break. It was also found that the ocean response to an upwelling favorablewind relaxation event was the presence of a poleward flow in place of the equatorward flow confined to the frontal upwelling dimensions. The ageostrophic circulation was missing during the relaxation event, due to the absence of lateral density gradients. The poleward flow defined by the shipboard observations was also defined by numerical simulations and satellite information. The latter representations showed a poleward warm anomaly propagation whose origin was Vizcaino Bay. The warm anomaly affected coastal upwelling and the stability of the along-slope California Undercurrent. The poleward warm anomaly propagation induced the separation of the California Undercurrent from the slope forming a meander-like structure, which evolved into a mesoscale eddy-like structure. Posteriorly, such eddy-like structure evolved in subsurface eddy with a warm anomaly core, a distinctive feature of the eddies formed from the California Undercurrent. During the initial stage of the eddy, it presented a cone-shape form with the maximum amplitude of the relative vorticity at the upper part of it. Posteriorly, the inviscid effects of the irregular bottom topography altered both the initial eddy trajectory and the initial eddy shape: the trajectory of the eddy changed from north-south to southwest; the initial shape changed from a cone-shape to a subsurface lens-type, with the maximum amplitude of the relative vorticity at 150 m depth. The eddy-topography interaction triggered inward heat fluxes from the environment toward the eddy through the horizontally-divergent ageostrophic component of the velocity field, accelerating the eddy-decay. In addition, surface filamentation processes erode the upper part of the eddy. During October 2009, the eddy was weak enough to be dissipated downstream the topographic obstacle. This thesis shows the relevance of the synoptic wind stress events and the irregularity of the bottom topography on the mesoscale circulation in the southern part |
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