IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
capítulos de libros
Título:
The Northern Argentine Sea
Autor/es:
JORGE MARCOVECCHIO; MAITE NARVARTE; DIEGO H. RODRÍGUEZ; ANA L. OLIVA; VALERIA A. GUINDER; ANDRÉS H. ARIAS; MARÍA ANDREA GAVIO; MARCELA S. GERPE; NOELIA LA COLLA; MARÍA CIELO BAZTERRICA; MELISA D. FERNÁNDEZ SEVERINI; SILVIA G. DE MARCO; SANDRA FIORI; MARÍA CELESTE LÓPEZ ABBATE; SERGIA ZALBA; CARLA V. SPETTER; SANDRA E. BOTTÉ
Libro:
World seas: an environmental evaluation
Editorial:
Elsevier BV
Referencias:
Lugar: Londres; Año: 2018; p. 759 - 782
Resumen:
The Northern Argentine Sea is part of the Southwestern Atlantic Ocean, extending from ~35°S to 42°S (Fig. 33.1). Thecontinental shelf is with a very low relief and a general slope of less than 0.01 degree (Cavallotto, Violante, & Hernández-Molina, 2011). Argentina?s continental margin is longer than 3500 km, with an average width of ~400 km (Preu, Hernández-Molina, Violante, Piola, et al., 2013). It originated during the Late Jurassic-Early Cretaceous (c.140 My ago), when theopening of the South Atlantic took place (Marcovecchio, De Marco, & Melo, 2017). The width of the shelf within this areavaries from ~140 km in the northern area of Río de La Plata outfall, to ~540 km at San Matías Gulf (SMG), with maximumdepth of 70?80 m, reaching ~200 m at the shelf edge, to ~160 m within the SMG (Mouzo, 2014).The main oceanographic features are the encounter of the Brazil and Malvinas/Falkland currents (MCs), producing theBrasil-Malvinas/Falkland Confluence Zone (BMCZ), a complex of mixed waters located between 35°S and 40°S. This regionis marked by a strong front formed by the warm, high saline, and low productivity waters of the Brazil Current (BC), andthe cold, less saline, and highly productive waters of the MC, and is characterized by intense horizontal and vertical mixingand a seasonal pattern of current intensification and latitudinal instability (Piola, Campos, Möller Jr., Charo, & Martinez,2000). In the confluence zone, the subantarctic and subtropical waters mix, forming vortices, meanders, and strong verticaland horizontal temperature and salinity gradients, as well as restricted areas of enhanced chlorophyll build-up, isolated upwellingcells, tongues, and patches of cold or warm waters partly or completely isolated from their water mass of origin, andso on. South of 37°S, three water masses are identified: shelf break (outer shelf) water of relatively high salinity (33.7?34),middle shelf water with relatively low values (33.4?33.6), and coastal (inner shelf) waters with values relatively higher (>34).