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Mesoscale subduction at the Almeria-Oran front. Part 2: biophysical interactions.

Mesoscale subduction at the Almeria-Oran front. Part 2: biophysical interactions.
Mesoscale subduction at the Almeria-Oran front. Part 2: biophysical interactions.
This paper presents a detailed diagnostic analysis of hydrographic and current meter data from three, rapidly repeated, fine-scale surveys of the Almeria–Oran front. Instability of the frontal boundary, between surface waters of Atlantic and Mediterranean origin, is shown to provide a mechanism for significant heat transfer from the surface layers to the deep ocean in winter. The data were collected during the second observational phase of the EU funded OMEGA project on RRS Discovery cruise 224 during December 1996. High resolution hydrographic measurements using the towed undulating CTD vehicle, SeaSoar, traced the subduction of Mediterranean Surface Water across the Almeria–Oran front. This subduction is shown to result from a significant baroclinic component to the instability of the frontal jet. The Q-vector formulation of the omega equation is combined with a scale analysis to quantitatively diagnose vertical transport resulting from mesoscale ageostrophic circulation. The analyses are presented and discussed in the presence of satellite and airborne remotely sensed data; which provide the basis for a thorough and novel approach to the determination of observational error.
ocean fronts, mesoscale features, baroclinic instability, vertical motion, downwelling, Mediterranean Sea, Western Mediterranean, Alboran Sea, Almeria–Oran front, 2.5°W–0.5°E, 35.0°N–37.5°N
0924-7963
287-304
Fielding, S.
6fcd5a6f-5526-490c-a34f-506174caa3f8
Crisp, N.
99a791be-1c93-478b-8846-763ef0b9e80d
Allen, J.T.
b251a62b-f443-4591-b695-9aa8c4d73741
Hartman, M.C.
cdd63b60-f89a-4ef8-842d-7803f8213c18
Rabe, B.
d1be8d17-899e-4154-98f9-7932532137c0
Roe, H.S.J.
c20f0cc4-fd68-4640-a80e-8405a22fa537
Fielding, S.
6fcd5a6f-5526-490c-a34f-506174caa3f8
Crisp, N.
99a791be-1c93-478b-8846-763ef0b9e80d
Allen, J.T.
b251a62b-f443-4591-b695-9aa8c4d73741
Hartman, M.C.
cdd63b60-f89a-4ef8-842d-7803f8213c18
Rabe, B.
d1be8d17-899e-4154-98f9-7932532137c0
Roe, H.S.J.
c20f0cc4-fd68-4640-a80e-8405a22fa537

Fielding, S., Crisp, N., Allen, J.T., Hartman, M.C., Rabe, B. and Roe, H.S.J. (2001) Mesoscale subduction at the Almeria-Oran front. Part 2: biophysical interactions. Journal of Marine Systems, 30 (3-4), 287-304. (doi:10.1016/S0924-7963(01)00063-X).

Record type: Article

Abstract

This paper presents a detailed diagnostic analysis of hydrographic and current meter data from three, rapidly repeated, fine-scale surveys of the Almeria–Oran front. Instability of the frontal boundary, between surface waters of Atlantic and Mediterranean origin, is shown to provide a mechanism for significant heat transfer from the surface layers to the deep ocean in winter. The data were collected during the second observational phase of the EU funded OMEGA project on RRS Discovery cruise 224 during December 1996. High resolution hydrographic measurements using the towed undulating CTD vehicle, SeaSoar, traced the subduction of Mediterranean Surface Water across the Almeria–Oran front. This subduction is shown to result from a significant baroclinic component to the instability of the frontal jet. The Q-vector formulation of the omega equation is combined with a scale analysis to quantitatively diagnose vertical transport resulting from mesoscale ageostrophic circulation. The analyses are presented and discussed in the presence of satellite and airborne remotely sensed data; which provide the basis for a thorough and novel approach to the determination of observational error.

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Published date: 2001
Keywords: ocean fronts, mesoscale features, baroclinic instability, vertical motion, downwelling, Mediterranean Sea, Western Mediterranean, Alboran Sea, Almeria–Oran front, 2.5°W–0.5°E, 35.0°N–37.5°N

Identifiers

Local EPrints ID: 323
URI: http://eprints.soton.ac.uk/id/eprint/323
ISSN: 0924-7963
PURE UUID: eb4c2afd-c7cc-4600-879e-088492ae8230

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Date deposited: 06 Feb 2004
Last modified: 27 Oct 2023 19:20

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Contributors

Author: S. Fielding
Author: N. Crisp
Author: J.T. Allen
Author: M.C. Hartman
Author: B. Rabe
Author: H.S.J. Roe

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