Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 24, Pages 8971-8977Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062523
Keywords
trend; Brazil Malvinas Confluence; Malvinas Current; Brazil Current
Categories
Funding
- National Science Foundation [OCE-0928348]
- NOAA [NA13OAR4310132]
- NASA [NNX08AR40G, NNX12AF67G]
- NASA [75169, NNX12AF67G, 95461, NNX08AR40G] Funding Source: Federal RePORTER
- Directorate For Geosciences
- Division Of Ocean Sciences [1357530] Funding Source: National Science Foundation
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Observations show abrupt changes in the oceanic circulation of the southwestern Atlantic. These studies report a southward drift of the Brazil/Malvinas Confluence (BMC) and a change in the spectral characteristics of the Malvinas Current (MC) transport. We address the cause of these changes using the result of a high-resolution numerical experiment. The experiment, which is consistent with observations, shows a southward BMC displacement at a rate of 0.62 degrees/decade between 1993 and 2008, and a shift of the spectral characteristics of the MC transport after 1999. We find that these changes are driven by a weakening of the northern branch of the Antarctic Circumpolar Current, which translates to a weakening of the MC transport and a southward BMC drift. The drift changes the spectral characteristics of the MC transport, which becomes more influenced by annual and semiannual variations associated with the BMC.
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