Rings of the North Brazil Current: their structure and behavior inferred from observations and a numerical simulation

D. M. Fratantoni, W. E. Johns, T. L. Townsend

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

Large anticyclonic rings are shed from the retroflecting North Brazil Current (NBC) near 8°N in the tropical western Atlantic. New subsurface velocity and temperature measurements within three such rings are presented here. A high-resolution numerical model of the Atlantic Ocean forced by monthly wind stress and an imposed meridional overturning cell is found to shed NBC rings that approximate those observed. Both observed and modeled NBC rings move northwestward along the coast of South America with a speed of 8-16 cm/s. At least 2-3 rings per year separate from the NBC retroflection. The core volume of a typical observed ring is 3.2 ± 1.0 × 1013 m3. This corresponds to an annualized per-ring mass transport near 1 Sv (106 m3/s). -from Authors

Original languageEnglish (US)
Pages (from-to)10,633-10,654
JournalJournal of Geophysical Research
Volume100
Issue numberC6
DOIs
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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