Zonal intermediate currents in the equatorial Atlantic Ocean.

Ollitrault, M., Lankhorst, Matthias, Fratantoni, D., Richardson, P. and Zenk, Walter (2006) Zonal intermediate currents in the equatorial Atlantic Ocean. Open Access Geophysical Research Letters, 33 (L05605). DOI 10.1029/2005GL025368.

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Acoustic float data collected near 800 m depth, are used to map zonal mean currents within the Antarctic Intermediate Water (AAIW) tongue in the equatorial Atlantic. Alternating zonal jets of 2° latitudinal width are revealed between 6°S and 6°N. Displacements from profiling floats drifting near 1000 m depth, also reveal similar zonal jets at the base of the AAIW layer. The strongest jets (15 cm s−1 peak) are found at 4°S, 2°S, 0°, 2°N and 4°N. They are coherent longitudinally over order of 3000 km and, poleward of 1°S and 1°N, generally coherent vertically between 800 m and 1000 m. Large seasonal fluctuations exist at both levels: within 1° of equator, AAIW at 800 m flows westward (8 cm s−1 mean) in boreal summer and fall but eastward (3 cm s−1 mean) in winter, whereas the flow at 1000 m is eastward in late fall and winter.

Document Type: Article
Keywords: Zonal intermediate currents, equatorial Atlantic Ocean
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2005GL025368
ISSN: 0094-8276
Date Deposited: 03 Dec 2008 16:51
Last Modified: 15 Feb 2018 11:40
URI: http://oceanrep.geomar.de/id/eprint/4409

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