land, where it meets the cold Labrador Current, it turns and flows north for roughly 1 of latitude. This branch of the Gulf Stream is called the North Atlantic Current (NAC). At 51N, the NAC abruptly turns east from Newfoundland, broadens, and slows down. Noting that at this turning point the NAC sheds anticyclonic eddies every few months, Woityra and Rossby analyze 10 years of satellite data to measure the size and exact formation rate of these eddies. Using an energy budget approach, they find that eddy formation is a natural result of the slowing, broadening NAC. The authors hypothesize that as eddies form, severe heat loss due to their exposed position in the southern Labrador Sea causes the water within the eddies to sink. Once they are isolated from the surface, they may survive for years as indicated by their findings south and west in the Sargasso Sea.
Title:
Current broadening as a mechanism for anticyclogenesis at the northwest corner of the North Atlantic Current
Authors:
Willian Woityra: Graduate School of Oceanography, University of Rhode Island, Kingston, Rhode Island, U.S.A.; now at U.S. Coast Guard, International Ice Patrol, Groton, Connecticut, U.S.A.;
T. Rossby: Graduate School of Oceanography, University of Rhode Island, Kingston, Rhode Island, U.S.A.
Source:
Geophysical Research Letters (GRL) paper 10.1029/2007GL033063, 2008; http://dx.doi.org/10.1029/2007GL033063
10. Plate tectonics in the East African Rift
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