Eddy formation behind the tropical island of Aldabra

Heywood, Karen J. ORCID: https://orcid.org/0000-0001-9859-0026, Stevens, David P. ORCID: https://orcid.org/0000-0002-7283-4405 and Bigg, Grant R. (1996) Eddy formation behind the tropical island of Aldabra. Deep-Sea Research Part I: Oceanographic Research Papers, 43 (4). pp. 555-578. ISSN 1879-0119

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Abstract

Oceanic eddy formation behind the tropical island of Aldabra is examined with a one-layer reduced gravity model. Thresholds for flow separation, eddy formation, eddy shedding, and wake instabilities are determined and compared with theory, observations and results of laboratory experiments for both rotating and non-rotating flows. It is shown that non-rotating fluid theory and the Reynolds number are appropriate for describing the occurrence of eddy shedding. For islands at higher lalitudes, thresholds move nearer those found in rotating laboratory experiments Strouhal numbers calculated from the model results agree with those predicted theoretically, confirming that the frequency of eddy shedding does not increase indefinitely with Reynolds number. Both the model results and data from the CZCS archive suggest that eddy shedding and the associated enhanced biological activity (and thus CO2 uptake) are common phenomena for Aldabra and by implication, other oceanic islands.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Environmental Sciences Faculty of Science > School of Mathematics (former - to 2024)
UEA Research Groups:	Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Meteorology, Oceanography and Climate Dynamics (former - to 2017) Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Fluid and Solid Mechanics (former - to 2024) Faculty of Science > Research Groups > Fluids & Structures Faculty of Science > Research Groups > Numerical Simulation, Statistics & Data Science
Depositing User:	David Stevens
Date Deposited:	01 Dec 2010 14:12
Last Modified:	07 Nov 2024 12:36
URI:	https://ueaeprints.uea.ac.uk/id/eprint/15863
DOI:	10.1016/0967-0637(96)00097-0

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