A vertical-mode extrapolation scheme applied to the Brazil Current domain: quasi-synoptic scenarios

Amorim, João P. M.; Silveira, Ilson Carlos Almeida da; Borges-Silva, Milton; Souza-Neto, Pedro W. M.; Belo, Wellington Ceccopieri; Lazaneo, Cauê Z.; Bernardo, P. S.; Dottori, Marcelo; Martins, Renato Parkinson; Moreira, Daniel Leite

doi:10.1590/2675-2824070.22141jpma

Cited by 2 publications

(1 citation statement)

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“…In this region there are formations of meanders that, occasionally, close out in rings which can be advected, absorbed or emitted by the BC [42][43][44]. The Cape Frio Eddy is a cyclonic ring originated by a necked meander and has an unstable quasi-stationary growth phase [40,45]. Most studies focused on how mesoscale processes influence the primary production, but less has been done to understand how these processes influence higher trophic levels such as zooplankton [46].…”

Section: Plos Onementioning

confidence: 99%

Modeling the larvae dispersion of sun coral in the Brazil current off Cape Frio: A cyclonic eddy scenario

Calado,

Cosenza,

Moraes

et al. 2023

PLoS ONE

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The study aims to understand the dispersal patterns of non-indigenous Tubastraea spp. (Sun Coral) larvae in the Brazil Current (BC), specifically in the Cape Frio recurrent cyclonic eddy (CFE) scenario. For this, the Regional Ocean Model System was used to simulate the hydrodynamic fields in a high-resolution nested grid, where a model of lagrangian floats, in a good approximation of the larvae properties and considering massive planulation events, was coupled with surface larval release from the Campos Basin area. The simulation was representative of mesoscale features compared to similar studies, ARGO vertical profiles and a py-eddy-track algorithm was used to obtain eddy variables, such as radius, rotational and translational velocities. These parameters are fundamental to access when an eddy tends to trap or not the water, heat and plankton in its interior. CFE turned out to be highly nonlinear, with a strong tendency to trap larvae in its core, acting as a dispersal constrictor when compared with the organisms in the axis of the higher speed of BC. A strong negative correlation (-0.75) was found between the days that larvae were inside the eddy and their distance from the origin. None of the 48,000 larvae released during simulated experiment a 16-day spawning event reached the coast. There are two different patterns for the dispersal, one along the shelf break and another, with higher larval density, off from the 1000 m isobath. The CFE’s presence allows larvae to remain in the same region for longer periods, although in offshore areas. Therefore, as there is considerable availability of fixed substrates on oil rig structures, larvae could settle on them resulting in a possible inter-platforms connectivity between populations of Tubastraea spp. Also, regions in the CFE that present downward vertical velocities (downwelling), may move young larvae to depths of about 60 m suggesting that subsurface colonizations are possible due to specific dynamics of propagating cyclonic eddies. So, identifying the main factors that affect the dispersion of propagules is essential to subsidize management policies for controlling bioinvasion associated with exploitation of hydrocarbon resources in offshore areas.

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