Submesoscale Phenomena Due to the Brazil Current Crossing of the Vitória Trindade Ridge
| Autor: | Dante C. Napolitano, I. C. A. da Silveira, Amit Tandon, Paulo H. R. Calil |
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| Přispěvatelé: | Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Vitória Trindade Ridge
flow topography interactions Brazil Current Intermediate Western Boundary Current OCEANOGRAFIA FÍSICA submesoscale Oceanography Current (stream) instability Geophysics Space and Planetary Science Geochemistry and Petrology [SDU]Sciences of the Universe [physics] Earth and Planetary Sciences (miscellaneous) Ridge (meteorology) Geomorphology Geology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
| Zdroj: | Journal of Geophysical Research: Oceans Journal of Geophysical Research: Oceans, 2021, 126, ⟨10.1029/2020JC016731⟩ Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| DOI: | 10.1029/2020JC016731⟩ |
| Popis: | International audience; At 20.5°S, the Brazil Current and the Intermediate Western Boundary Current interact with a quasi zonal seamount chain, the Vitória Trindade Ridge (VTR). While the mesoscale variability generated due to these western boundary currents crossing the VTR has been recently studied, the submesoscale dynamics associated with such features have never been addressed. Here, we use new observations and a 2 km resolution model to analyze the role of the VTR seamounts in the regional submesoscale dynamics, their seasonality, and instabilities. We present new high resolution velocity and density observations that capture submesoscale features associated with the flow. Within these regions, potential vorticity (PV) reveals patches of symmetrically unstable flow close to seamounts. The horizontal resolution (Δx ≃ 1.5 km) of our quasi synoptic observations (10 h) partially resolves submesoscale instabilities. Our Regional Oceanic Modeling System simulation identifies two regimes of submesoscale activity in the region, one typically associated with the seasonal cycle of the mixed layer, and a second associated with flow-topography interactions. A spatiotemporal analysis of the vertical buoyancy fluxes points to these flow-topography interactions as the main source of recurrent, deeper instabilities. As the VTR emerges as a submesoscale hotspot in the oligotrophic South Atlantic, the lack of observations still remains the main obstacle to better understand submesoscale processes in the region. |
| Databáze: | OpenAIRE |
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