Abyssal Circulation in the Somali Basin.

Dengler, Marcus , Quadfasel, Detlef, Schott, Friedrich and Fischer, Jürgen (2002) Abyssal Circulation in the Somali Basin. Deep-Sea Research Part II-Topical Studies in Oceanography, 49 (7-8). pp. 1297-1322. DOI 10.1016/S0967-0645(01)00167-9.

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Abstract

The bottom and deep circulation in the Somali Basin are investigated on the basis of hydrographic and direct velocity profiles from three shipboard surveys carried out during the southwest monsoon in 1995 and of velocity time series from the WOCE mooring array ICM7. The inflow of bottom water into the Somali Basin through the Amirante Passage drives a thermohaline circulation, which may be modulated by the monsoon wind forcing. Details of the abyssal circulation have been discussed controversially. Deep velocity records from the mooring array in the northern Somali Basin are dominated by fluctuations with periods of 30–50 days and amplitudes above Full-size image (<1 K). Despite this strong variability annual record averages indicate the existence of a deep western boundary current (DWBC) below Full-size image (<1 K) at the base of the continental slope south of Socotra Island as part of a cyclonic bottom circulation. The southwestward DWBC transport off Socotra Island is estimated to Full-size image (<1 K). The bottom and deep water exchange between the Somali and Arabian Basin north of 7°N is estimated from two cross-basin geostrophic velocity sections referenced by vertically averaged LADCP currents. For the bottom water, an eastward transport into the Arabian Basin of Full-size image (<1 K) and Full-size image (<1 K) was determined in June and August, respectively, while for the deep-water layer above Full-size image (<1 K) eastward transports of Full-size image (<1 K) in June and Full-size image (<1 K) in August were obtained.

Document Type: Article
Keywords: R.V. Meteor; M32
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0967-0645(01)00167-9
ISSN: 0967-0645
Projects: WOCE
Expeditions/Models/Experiments:
Date Deposited: 18 Feb 2008 17:25
Last Modified: 12 Oct 2016 09:03
URI: http://oceanrep.geomar.de/id/eprint/1824

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