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Gestão territorial de unidades de conservação litorâneas frente a proteção de recursos hídricos: estudo de caso no litoral oeste do Ceará

2023-09-08T14:33:44Z

Título: Gestão territorial de unidades de conservação litorâneas frente a proteção de recursos hídricos: estudo de caso no litoral oeste do Ceará Autor(es): Sousa, Kelven Pinheiro de; Matos, Fábio de Oliveira Tipo: Artigo de Evento

The influence of the Southern Annular Mode (SAM) over the sea surface temperatures in the southwestern Atlantic

2022-02-08T17:54:28Z

Título: The influence of the Southern Annular Mode (SAM) over the sea surface temperatures in the southwestern Atlantic Autor(es): Teixeira, Carlos Eduardo Peres; Lentini, Carlos Alessandre Domingos; Mata, Mauricio Magalhães Abstract: Sea surface temperature (SST) is shown to be an important key player to the studying of air-sea interaction phenomenon and in the determination of the regional and global climate variability. [...] Tipo: Artigo de Evento

Vrginie Biophysical couplings in South Australian shelf waters under conditions of summer upwelling and winter downwelling - Results from the Southern Australian Integrated Marine Observing System (SAIMOS)

2022-02-08T18:03:34Z

Título: Vrginie Biophysical couplings in South Australian shelf waters under conditions of summer upwelling and winter downwelling - Results from the Southern Australian Integrated Marine Observing System (SAIMOS) Autor(es): Seuront, Seuront; Leterme, Sophie; Middleton, John; Byrne, Shaun; James, Charles; Luick, John; Nedoncelle, Karine; Patterson, James; Teixeira, Carlos Eduardo Peres; Van Dongen-Vogels, Virginie Abstract: The Southern Australia Integrated Marine Observing System, or SAIMOS, is one of five nodes operating as part of the Australia-wide Integrated Marine Observing System (IMOS). This collaborative program is designed to observe Australia’s oceans, both coastal and bluewater. Since February 2008 Physical Data has been collected for SAIMOS in both summer and winter months during 8 surveys. The data collected during summer are used to characterise the nature and dynamics of the Kangaroo Island-Eyre Peninsula upwelling system during a record upwelling event in February 2008. During this event a plume of very cool water was observed along the bottom from South of Kangaroo Island up to the Eyre Peninsula. This plume dissipated rapidly after the end of upwelling favourable winds and by March 2008 had disappeared entirely from the observations. The data are also used to study the dense high salinity outflow from Spencer Gulf observed during the winter months, and resulting from surface cooling of high salinity waters at the head of Spencer Gulf. The outflow occurs during a series of strong pulses with a period of approximately 2 weeks and duration of 1-3 days, with bottom velocities at 100 m exceeding 1 m s-1. The abundance and composition of viral, bacterial and pico- and nanoplankton communities have concurrently been investigated. In summer, the space-time dynamic of viral, bacterial and pico- and nanoplankton communities is generally driven by the plume of upwelled, cool and nutrient rich water that flows across the continental shelf, and is locally heavily influenced by the level of vertical stability of the water column. In winter, the structure of the plankton community is related to the local physical properties of the water column, i.e. dense plume of bottom waters outflowing from the Spencer Gulf, vertical stability of the water column and presence of a deep chlorophyll maximum. Tipo: Artigo de Evento

The impact of different forcing agents on the residual circulation in Baía de Todos os Santos, Brazil 13°S

2022-02-07T19:24:42Z

Título: The impact of different forcing agents on the residual circulation in Baía de Todos os Santos, Brazil 13°S Autor(es): Teixeira, Carlos Eduardo Peres; Lessa, Guilherme Camargo; Santana, Rafael Costa Abstract: This study investigates the forcing of the residual circulation in Baía de Todos os Santos (BTS), surrounded by the third largest metropolis in Brazil. The Regional Ocean Modeling System (ROMS) was used to investigate the roles of the tide (TD), wind (WN), net heat flux (HF), freshwater flux (WF) and river discharge (RD) on the residual circulation. We forced the model in the boundaries with tidal elevations and currents from the global tidal model TPX07.2, and at the surface with wind stresses, fresh water and heat fluxes from a combination of NCEP/Reanalises and data from local weather stations. The modeled tidal circulation agrees well with current observations (mean percentage absolute deviation = 17%). The residual velocities have magnitudes smaller than 0.09 m/s. The flow is structured at the by moth with a net-landward flow (positive) in the channel centre and a net-seaward flow on the shoulders for all scenarios (Figures 2a, b and c) but that including the river discharge (Figure 2d). The lateral stratification associated with residuals currents, when forced by TD, WN+TD and HF+WF+WN+TD, is similar to that reported by Xavier (2002) running a barotropic model, and also in good agreement with analytical solutions presented by Li & O'Donnell (2005) for short (4*L/λ < 0.6) channels like the BTS. Adding river discharge to the model (Figure 2d) results in a vertically sheared residual flow across most of the channel, with flow magnitudes similar to that created by the other forcing. The results show that the tide is the main agent on the RC, however, the river discharge can significantly modify it. Tipo: Artigo de Evento