Forcing of the Atlantic equatorial deep jets derived from observations

dc.contributor.author Claus, Martin
dc.contributor.author Greatbatch, Richard J.
dc.contributor.author Brandt, Peter
dc.contributor.author Toole, John M.
dc.date.accessioned 2017-02-14T19:34:47Z
dc.date.available 2017-02-14T19:34:47Z
dc.date.issued 2016-11-23
dc.description Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 46 (2016): 3549-3562, doi:10.1175/JPO-D-16-0140.1. en_US
dc.description.abstract The equatorial deep jets (EDJs) are a ubiquitous feature of the equatorial oceans; in the Atlantic Ocean, they are the dominant mode of interannual variability of the zonal flow at intermediate depth. On the basis of more than 10 years of moored observations of zonal velocity at 23°W, the vertically propagating EDJs are best described as superimposed oscillations of the 13th to the 23rd baroclinic modes with a dominant oscillation period for all modes of 1650 days. This period is close to the resonance period of the respective gravest equatorial basin mode for the dominant vertical modes 16 and 17. It is argued that since the equatorial basin mode is composed of linear equatorial waves, a linear reduced-gravity model can be employed for each baroclinic mode, driven by spatially homogeneous zonal forcing oscillating with the EDJ period. The fit of the model solutions to observations at 23°W yields a basinwide reconstruction of the EDJs and the associated vertical structure of their forcing. From the resulting vertical profile of mean power input and vertical energy flux on the equator, it follows that the EDJs are locally maintained over a considerable depth range, from 500 to 2500 m, with the maximum power input and vertical energy flux at 1300 m. The strong dissipation closely ties the apparent vertical propagation of energy to the vertical distribution of power input and, together with the EDJs’ prevailing downward phase propagation, requires the phase of the forcing of the EDJs to propagate downward. en_US
dc.description.sponsorship MC is grateful for support from the German Federal Ministry of Education and Research (BMBF) Miklip project through the MODINI project. RJG and PB are grateful for continuing support from the GEOMAR Helmholtz Centre for Ocean Research Kiel. This study has also been supported by the Deutsche Forschungsgemeinschaft as part of the Sonderforschungsbereich 754 “Climate-Biogeochemistry Interactions in the Tropical Ocean,” through several research cruises with R/V Meteor and R/V Maria S. Merian by the German Federal Ministry of Education and Research as part of the cooperative projects “RACE” and “SACUS” and by European Union 7th Framework Programme (FP7 2007–2013) under Grant Agreement 603521 PREFACE project. Additional support for the observations and JMT’s contributions were provided by the U.S. National Science Foundation (OCE-0850175). en_US
dc.identifier.citation Journal of Physical Oceanography 46 (2016): 3549-3562 en_US
dc.identifier.doi 10.1175/JPO-D-16-0140.1
dc.identifier.uri https://hdl.handle.net/1912/8714
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.relation.uri https://doi.org/10.1175/JPO-D-16-0140.1
dc.subject Tropics en_US
dc.subject Forcing en_US
dc.subject Shallow-water equations en_US
dc.subject Waves, oceanic en_US
dc.subject Oscillations en_US
dc.subject Interannual variability en_US
dc.title Forcing of the Atlantic equatorial deep jets derived from observations en_US
dc.type Article en_US
dspace.entity.type Publication
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relation.isAuthorOfPublication.latestForDiscovery 79e80421-0f7c-421a-ae3d-6867a8d1df6e
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