Abstract
A cyclonic Gulf Stream ring was tracked in the western Sargasso Sea from March 1971 to April 1972. It moved 700 km southwest at 2 km day −1 and coalesced with the Gulf Stream off Cape Canaveral. During the first eight months the ring was in relatively deep water and available potential energy relative to 1000 m decayed at an estimated linear rate of 10 21ergs day −1. The ring had a life expectancy of approximately 2–5 years. During the final three months it moved into shallower water and the decay rate accelerated more than fourfold. Layers of Sargasso Sea water inside the ring indicated mixing with surrounding water that may be the decay mechanism of the ring.
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