期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 122, 期 9, 页码 7433-7448出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017JC012700
关键词
upweling filament; Lagrangian coherent structures; mesoscale eddies; offshore transport; particle dispersion
类别
资金
- Ministerio de Economia y Competitividad
- Fondo Europeo de Desarrollo Regional through LAOP project [CTM2015-66407-P]
- Fondo Europeo de Desarrollo Regional through a Juan de la Cierva Incorporacion fellowship [IJCI-2014-22343]
- Portuguese FCT (Foundation for Science and Technology)
- Fundo Social Europeu (FSE/QREN/POPH) [SFRH/BD/63840/2009]
The three-dimensional structure, dynamics, and dispersion characteristics of a simulated upwelling filament in the Iberian upwelling system are analyzed using Lagrangian tools. We used a realistic regional simulation of the western Iberian shelf which is concomitant with an in situ oceanographic campaign that surveyed the area. We compute 3-D fields of finite-size Lyapunov exponents (FSLE) from 3-D velocity fields and extract the field's ridges to study the spatial distribution and temporal evolution of the Lagrangian Coherent Structures (LCSs) evolving around the filament. We find that the most intense curtain-like LCSs delimit the boundaries of the whole filamentary structure whose general properties match well the observations. The filament interior is characterized by small dispersion of fluid elements. Furthermore, we identify a weak LCS separating the filament into a warmer vein and a colder filament associated with the interaction of a mesoscale eddy with the upwelling front. The cold upwelled water parcels move along the filament conserving their density. The filament itself is characterized by small dispersion of fluid elements in its interior. The comparison of LCSs with potential temperature and salinity gradient fields shows that the outer limits of the filament coincide with regions of large hydrographic gradients, similar to those observed, explaining the isolation of the interior of the filament with the surrounding waters. We conclude that the Lagrangian analysis used in this work is useful in explaining the dynamics of cross-shore exchanges of materials between coastal regions and the open ocean due to mesoscale processes.
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