CFC-113 SHOWS BRAZIL EDDY CROSSING THE SOUTH-ATLANTIC TO THE AGULHAS RETROFLECTION REGION

Using the new ocean tracer CFC-113 and other hydrographic and chemical data, we have identified and ''aged'' a Brazil eddy transported acros s the South Atlantic to the Cape Basin. This is the first observation of such an eddy so far east. It was observed during two RRS Discovery cruises in January and May 1993, and using TOPEX-POSEIDON altimeter da ta, we have been able to track it between the two locations. TS and nu trient characteristics show that the eddy could not have an eastern At lantic origin. Comparison with eddies found in the Brazil/Falklands Co nfluence suggests that this is the most likely source. From the CFC-11 3:CFC-11 ratio it appears that the eddy is in excess of 4 years old, a nd from the two sightings and the altimeter data we have estimated a t ransport rate for the eddy and given credence to the CFC-113:CFC-11 an d CFC-113:CFC-12 ageing technique in surface waters.