期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 19, 页码 8072-8080出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065695
关键词
ocean general circulation modeling; Atlantic meridional overturning circulation; tropical Atlantic circulation; wind-driven variability; buoyancy-driven variability
资金
- Cluster of Excellence The Future Ocean [CP1412]
- Cluster of Excellence The Future Ocean (Research Platform S4)
- German Research Foundation (DFG)
- German Federal Ministry for Education and Research (BMBF) under the SPACES project [03G0835A]
The North Brazil Current (NBC) constitutes a bottleneck for the mean northward return flow of the Atlantic Meridional Overturning Circulation (AMOC) in the tropical South Atlantic. Previous studies suggested a link between interannual to multidecadal NBC and AMOC transport variability and proposed to use NBC observations as an index for the AMOC. Here we use a set of hindcast, sensitivity, and perturbation experiments performed within a hierarchy of ocean general circulation models to show that decadal to multidecadal buoyancy-forced changes in the basin-scale AMOC transport indeed manifest themselves in the NBC. The relation is, however, masked by a strong interannual to decadal wind-driven gyre variability of the NBC. While questioning the NBC transport as a direct index for the AMOC, the results support its potential merit for an AMOC monitoring system, provided that the wind-driven circulation variability is properly accounted for.
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