Malvinas Current variability as observed by satellite altimetry data

SARACENO, M.; ARTANA, C. I.; BODICHON, R.; PROVOST, C.

Simposio; 40th COSPAR Scientific Assembly
; 2014

The Malvinas Current (MC) is the northernmost extension of the Antarctic Circumpolar Current that carries cold and nutrient-rich waters. The MC is thought to be a major source of nutrients to the SW South Atlantic. The interaction of the MC with the sloping bottom is presumably responsible for sustaining upwelling along the shelf-break. Numerical and analytical models indicate that the upwelling intensity and mean transport along the Patagonian continental shelf is modulated by the MC transport. Apart from its regional influence, the MC contributes to regulate the climate since it helps the exchange of heat and salt as is a crucial component of the Meridional Overturning Circulation. Satellite altimetry data in conjunction with in-situ data allowed monitoring the transport of the MC at 41ºS. A CNES founded program will repeat those measures and will measure at the same time currents over the continental shelf under a satellite altimetry track. First deployment of instruments will occur in November 2014. In this work we use satellite altimetry data only to explore the relationship between the MC and continental shelf transports and the correspondence between the variability of the MC and the mesoscale activity in the SW South Atlantic. Results suggest that (i) the large decreases of the MC transport are associated to anticyclonic eddies that interact with the MC and (ii) the first mode associated to the variability of the transport over the Patagonian continental shelf is significantly correlated to the first mode of variability of the MC transport.