Stacked jets in the deep equatorial Atlantic Ocean.

Eden, Carsten and Dengler, Marcus (2008) Stacked jets in the deep equatorial Atlantic Ocean. Open Access Journal of Geophysical Research: Oceans, 113 . C04003. DOI 10.1029/2007JC004298.

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Abstract

Middepth current measurements in the equatorial Atlantic are characterized by elevated levels of energy contained in zonal flows of high baroclinic mode number. These alternating zonal flows, often called equatorial stacked jets, have amplitudes up to 20 cm s−1 and vertical wavelengths of 600 m. The jets are most pronounced in the depth range between 500 and 2500 m. Repeated direct velocity observations at 35°W indicate that the jets are coherent within ±1° of the equator. Individual jets can persist for 1–2 years, but they appear and decay rather irregularly. The equatorial stacked jets are also found in realistic general circulation model simulations. The features grow in amplitude with increasing horizontal and vertical model resolution. However, even at very high model resolutions, their amplitudes are still underestimated. In all model simulations, high levels of energy related to the stacked jets are found in the vicinity of the western boundary currents (WBCs). Depth range and strength of the WBCs in different experiments are related to depth range and strength of the jets. In the interior, stacked jets are characterized by eastward wave propagation suggesting that high baroclinic mode Kelvin waves radiate energy generated in the WBC into the interior and form the stacked jets.

Document Type: Article
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
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2007JC004298
ISSN: 2169-9275
Projects: Future Ocean, BMBF Nordatlantik, SOPRAN
Expeditions/Models/Experiments:
Date Deposited: 03 Dec 2008 16:51
Last Modified: 24 Apr 2018 13:28
URI: http://oceanrep.geomar.de/id/eprint/7210

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