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Titel |
On the width of the equatorial deep jets |
VerfasserIn |
Martin Claus, Richard Greatbatch, Peter Brandt, Sven-Helge Didwischus, Yau Fu |
Konferenz |
EGU General Assembly 2013
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 15 (2013) |
Datensatznummer |
250075902
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Zusammenfassung |
The equatorial deep jets (EDJ) are a striking feature of the equatorial ocean circulation. In the
Atlantic Ocean, the EDJ are associated with a vertical scale of between 300 and 700 m, a
time scale of roughly 4.5 years and upward energy propagation to the surface. It
has been found that the meridional width of the EDJ is roughly 1.5 times larger
than expected based on their vertical scale. Here a representation of a equatorial
basin mode excited in a linear shallow water model for a high order baroclinic
vertical normal mode is used as a simple model for the EDJ. We argue that mixing of
momentum along isopycnals can explain the enhanced width and a lateral eddy
viscosity of 300m2s-1 is found to be sufficient to account for the width implied by
observations. Additionally, the effect of barotropic mean flow on the spatial and
temporal structure of the wave field is studied. A mean flow resembling the Atlantic
Equatorial Intermediate Current System with eastward jets at 2°N/S and westward
flow in between results in a wave shielding of the equatorial band from adjacent
regions. |
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