Artículos científicos

URI permanente para esta colecciónhttp://10.0.96.45:4000/handle/11056/14821

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Flushing time in Perlas Lagoon and Bluefields Bay, Nicaragua
(Escuela de Ciencias del Mar. Pontificia Universidad Católica de Valparaíso, 2007) Brenes, Carlos L.; Hernández, Aldo; Ballestero, Daniel
The flushing time of Perlas Lagoon and Bluefields Bay were studied in January, March, May, and July 2001. Calculations of the total water volume, tidal prism, mean salinity, and fresh water flows are shown. The flushing times range from 14 to 17 days for Perlas Lagoon and from 2 to 4 days for Bluefields Bay. Flushing time variability, determined largely by the fresh water contribution, is greater for Bluefields Bay, duplicating its magnitude during the dry months compared to the rainy season. In both bodies of water, the relationship between fresh water input and flushing time is inverse: for Bluefields Bay T = 5.2·e-0.0008 (FW), where r2 = 0.835 and for Perlas Lagoon T= 20.2·e-0.0004 (FW), where r2 = 0.873. Key words: flushing time, coastal lagoons, Caribbean Sea.
Generation and propagation of anticyclonic rings in the Gulf of Papagayo
(Taylor & Francis, 2004) Ballestero, D.; Coen, J. E.
Lagrangian drifting buoys, local meteorological stations and AVHRR data were used to describe the generation and propagation of anticyclonic rings in the Gulf of Papagayo during the upwelling season in 1996. Some observations were consistent with two generation mechanisms previously proposed: forcing by inertially rotating Papagayo wind jets and conservation of potential vorticity in the Costa Rica Coastal Current. A westward speed of propagation of 12.6 cm s21 was obtained for these vortices. The relevance of the Papagayo system at regional scale is discussed.
Geostrophic circulation between the Costa Rica Dome and Central America
(Elsevier, 2008) Brenes, C.L.; Lavín, M.F.; Mascarenhas, Affonso S.
The geostrophic circulation between the Costa Rica Dome and Central America is described from CTD observations collected in two surveys: (a) The Wet Cruise in September–October 1993, and the Jet Cruise in February–March 1994. Poleward coastal flow was present on both occasions, but the transition from flow around the dome to the poleward Costa Rica Coastal Current flow was quite tortuous because of the presence of mesoscale eddies. In particular, a warm anticyclonic eddy was found off the Gulf of Fonseca during both cruises, at an almost identical position and with similar dimensions (150 m deep, 250 km in diameter) and surface speed (0.5 m s 1 ). In the Gulf of Panama, poleward flow was also observed, weaker in February–March 1994 than in September–October 1993, when it penetrated to 600 m depth and transported 8.5 Sv. In September–October 1993, the current between the dome and the coast was mostly 100 m deep and weak ( 0.15 m s 1 ), although in its southern side it was deeper ( 450 m) and faster at 0.3 m s 1 . The poleward transport between the dome and the coast was 7 Sv. In February–March 1994 the Costa Rica Dome was a closed ring adjacent to the continental shelf, 500 km in diameter, at least 400 m deep, had geostrophic surface speeds 0.25 m s 1 , and subsurface maximum speed (0.15–0.20 m s 1 ) at 180 m depth; the associated uplift of the isotherms was 150 m. The flow in the south part of the dome splits into two branches, the weakest one going around the dome and the strongest one continuing east and turning south before reaching the Gulf of Panama. r 2008 Elsevier Ltd. All rights reserved.

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