IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Across-Shelf Transport and Exchange of Water Masses on the Patagonian Shelf
Autor/es:
PIOLA, A.; PALMA, E.; GUIHOU, K.; CHIDICHIMO, M. P.
Lugar:
Portland
Reunión:
Conferencia; Ocean Science; 2018
Resumen:
The Patagonian shelf (PS) on the Atlantic is one of the largest marine ecosystems of the southern hemisphere, and hosts large primary production and fisheries.The PS exhibits low-salinity waters, associated with inflow from the southeast Pacific via the Magellan Strait, le Maire Strait and the Cape Horn Current. The Magellan inflow is a source of low salinity waters that characterizes most of the shelf. A thermohaline front along the shelf break separates the shelf waters from the cold, salty and nutrient rich Malvinas Current (MC). The MC acts as a barrier between the shelf and the open ocean, but develops mesoscale features which interact and mix with the shelf waters, bringing nutrients on the shelf.Though the Magellan Strait flow leads to the most prominent thermohaline feature observed over the extensive PS there are no direct transport observations through the Magellan strait. This presentation addresses the space-time variability of the Magellan Strait throughflow and the shelf-sea exchange up to 37°S using numerical modeling, lagrangian technics and observations. Seasonal to interanual variability of the transport is addressed, along and across the shelf as well as through the straits. A global numerical configuration (NEMO ORCA at 1/12°) and a regional configuration (ROMS Combes and Matano at 1/12°), with a finer representation of the Magellan strait and continental runoff, are used in combination with observations to assess the variability of the exchange over 3 decades. Passive tracer studies are used to analyze the intrusions of slope current on the shelf and its associated mesoscale activity, as well as the origin and fate of the shelf waters.