Articles | Volume 18, issue 6
https://doi.org/10.5194/os-18-1763-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-18-1763-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Dec 2022
Research article |
| 15 Dec 2022
| 15 Dec 2022
Planktonic cnidarian responses to contrasting thermohaline and circulation seasonal scenarios in a tropical western boundary current system
Everton Giachini Tosetto
CORRESPONDING AUTHOR
MARBEC, Univ Montpellier, CNRS, IFREMER, IRD, Sète, 34200, France
Institut de Recherche pour le Développement, Sète, 34200,
France
Departamento de Oceanografia, Universidade Federal de Pernambuco,
Recife, 50670-901, Brazil
Arnaud Bertrand
MARBEC, Univ Montpellier, CNRS, IFREMER, IRD, Sète, 34200, France
Institut de Recherche pour le Développement, Sète, 34200,
France
Departamento de Oceanografia, Universidade Federal de Pernambuco,
Recife, 50670-901, Brazil
Departamento de Pesca e Aquicultura, Universidade Federal Rural de
Pernambuco, Recife, 52171-900, Brazil
Sigrid Neumann-Leitão
Departamento de Oceanografia, Universidade Federal de Pernambuco,
Recife, 50670-901, Brazil
Alex Costa da Silva
Departamento de Oceanografia, Universidade Federal de Pernambuco,
Recife, 50670-901, Brazil
Miodeli Nogueira Júnior
Departamento de Sistemática e Ecologia, Universidade Federal da
Paraíba, João Pessoa, 58051-900, Brazil
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Twin simulations, with and without tides, are used to assess the impact of internal tides (ITs) on ocean temperature off the Amazon mouth at a seasonal scale. We found that in the surface layers, ITs and barotropic tides cause a cooling effect on sea surface temperature, subsequently leading to an increase in the net heat flux between the atmosphere and ocean. Vertical mixing is identified as the primary driver, followed by vertical and horizontal advection.
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Ocean Sci. Discuss., https://doi.org/10.5194/os-2021-101, https://doi.org/10.5194/os-2021-101, 2021
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Active acoustics has been used to characterize physical structures and processes in the ocean, typically attributed to biological dispersion or turbulent structures. We take advantage of acoustic data from the Southwest Atlantic to test the feasibility of this approach in an oligotrophic region. The results show that the thermohaline structure impacts the vertical distribution of acoustic scatterers, however the methods tested did not allow a robust estimate of the thermohaline limits.
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Short summary
In the western tropical South Atlantic, coastward currents spread oceanic cnidarians over the continental shelf. While both coastal and oceanic communities co-occur in scenarios of higher runoff and weaker boundary current intensity, oceanic species dominate almost the entire shelf during the dry season characterized by stronger currents. Meanwhile, offshore, when the mixed-layer depth is shallower, the enhanced primary productivity supports larger populations of planktonic cnidarians.
In the western tropical South Atlantic, coastward currents spread oceanic cnidarians over the...
