Interannual to decadal changes in the western boundary circulation in the Atlantic at 11°S

Hummels, Rebecca, Brandt, Peter, Dengler, Marcus, Fischer, Jürgen, Araujo, Moacyr, Veleda, Doris and Durgadoo, Jonathan V. (2015) Interannual to decadal changes in the western boundary circulation in the Atlantic at 11°S Geophysical Research Letters, 42 (18). pp. 7615-7622. DOI 10.1002/2015GL065254.

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Abstract

The western boundary current system off Brazil is a key region for diagnosing variations of the Atlantic meridional overturning circulation (AMOC) and the southern subtropical cell. In July 2013 a mooring array was installed off the coast at 11°S similar to an array installed between 2000 and 2004 at the same location. Here we present results from two research cruises and the first 10.5 months of moored observations in comparison to the observations a decade ago. Average transports of the North Brazil Undercurrent and the Deep Western Boundary Current (DWBC) have not changed between the observational periods. DWBC eddies that are predicted to disappear with a weakening AMOC are still present. Upper layer changes in salinity and oxygen within the last decade are consistent with an increased Agulhas leakage, while at depths water mass changes are likely related to changes in the North Atlantic as well as tropical circulation changes.

Document Type: Article
Additional Information: WOS:000363412400047
Keywords: western boundary circulation; R.V. SONNE; R.V. Meteor; FOR1740; M47/1; M53/2; M62/2; M98/1; M106; SO151; SO170
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
DOI etc.: 10.1002/2015GL065254
ISSN: 0094-8276
Projects: RACE, SPACES, FOR1740
Expeditions/Models:
Date Deposited: 02 Oct 2015 12:09
Last Modified: 10 Apr 2017 08:14
URI: http://eprints.uni-kiel.de/id/eprint/29893

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