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Ocean response and feedback to the SST dipole in the Tropical Atlantic


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Joyce, TM, Frankignoul, C, Yang, J and Phillips, HE 2004 , 'Ocean response and feedback to the SST dipole in the Tropical Atlantic' , Journal of Physical Oceanography, vol. 34, no. 11 , pp. 2525-2540 , doi: 10.1175/JPO2640.1.

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The equatorial SST dipole represents a mode of climate variability in the tropical Atlantic Ocean that is
closely tied to cross-equatorial flow in the atmosphere, from the cold to the warm hemisphere. It has been
suggested that this mode is sustained by a positive feedback of the tropical winds on the cross-equatorial SST
gradient. The role, if any, of the tropical ocean is the focus of this investigation, which shows that at the latitudes
of the SST signal (centered on 108N/S) there is a weak positive feedback suggested in data from the last half
century, that the cross-equatorial wind stress is closely coupled to this SST gradient on monthly time scales
with no discernable lag, and that the period from January to June is the most active period for coupling. Northward
(southward) anomalies of cross-equatorial wind stress are associated with a substantial negative (positive) wind
stress curl. This wind system can thus drive a cross-equatorial Sverdrup transport in the ocean from the warm
to the cold side of the equator (opposite the winds) with a temporal lag of only a few months. The oceanic
observations of subsurface temperature and a numerical model hindcast also indicate a clear relationship between
this mode of wind-driven variability and changes in the zonal transport of the North Equatorial Countercurrent.
It is estimated that the time-dependent oceanic flow is capable of providing a significant contribution to the
damping of the SST dipole but that external forcing is essential to sustaining the coupled variability.

Item Type: Article
Authors/Creators:Joyce, TM and Frankignoul, C and Yang, J and Phillips, HE
Keywords: Atlantic, SST, dipole, feedback, climate, equatorial
Journal or Publication Title: Journal of Physical Oceanography
ISSN: 1520-0485
DOI / ID Number: 10.1175/JPO2640.1
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