Inferring bottom circulation based on sediment pattern distribution in the San José Gulf, Patagonia Argentina
| Autor: | Gaspar Soria, Alberto Sánchez, Federico Ignacio Isla, Pedro J. Barón, Rodrigo D. Hernández-Moresino, Augusto César Crespi-Abril |
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| Rok vydání: | 2019 |
| Předmět: |
010506 paleontology
Wind stress 010502 geochemistry & geophysics GRAIN-SIZE DISTRIBUTION 01 natural sciences Ciencias de la Tierra y relacionadas con el Medio Ambiente Ocean gyre BOTTOM HYDRODYNAMICS WIND STRESS FRONTAL SYSTEM 0105 earth and related environmental sciences Earth-Surface Processes geography geography.geographical_feature_category Oceanografía Hidrología Recursos Hídricos Sediment Geology Westerlies SEMI-ENCLOSED BASIN Oceanography Mudflow Aeolian processes Hydrography SEDIMENT TRANSPORT Sediment transport CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | Journal of South American Earth Sciences. 89:189-196 |
| ISSN: | 0895-9811 |
| Popis: | The goal of this work was to infer the spatio-temporal patterns of bottom circulation of San José Gulf (SJG), Patagonia, Argentina. The SJG is mainly affected by tidal circulation and presents two hydrographic domains. The Western Hydrographic Domain (WHD) presents vertically mixed waters year-round contrary to the seasonal stratified Eastern Hydrographic Domain (EHD), resulting in the formation of a thermal front between domains. Samples of sediments were collected in spring 2016 and summer 2017 at several locations to analyze the grain-size composition by means of laser diffractometry. A conceptual model of bottom hydrodynamics was inferred based on sediment's grain-size trends. Asymmetric dominant tidal currents affect bottom sediment distribution. A general northward sediment transport is dominant at the WHD, while at the EHD there is a seasonal shift in the transport direction. There, a net northward transport with a counterclockwise gyre dominates bottom hydrodynamics at the end of the thermal front formation, conditioned by residual currents. In contrast, a net southward circulation likely driven by strong westerly winds throughout autumn and winter prevails at the beginning of the water column stratification. The inferred sediment transport suggests a net loss of material that has to be recovered by tidal currents entering through the mouth and coastal sources as runoff, mudslides, and/or aeolian dust. Fil: Hernández Moresino, Rodrigo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina Fil: Crespi Abril, Augusto Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Soria, Rodrigo Gaspar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Sánchez, Alberto. Centro Interdisciplinario de Ciencias Marinas; México Fil: Isla, Federico Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Baron, Pedro Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina |
| Databáze: | OpenAIRE |
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