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Observations of a young Agulhas ring, Astrid, during MARE in March 2000

Observations of a young Agulhas ring, Astrid, during MARE in March 2000
Observations of a young Agulhas ring, Astrid, during MARE in March 2000
The MARE project studies the effects of inter-ocean exchange between the Indian and Atlantic Ocean, via Agulhas rings, on the Atlantic meridional overturning circulation. The field programme of MARE concentrates on the study of the decay and modification of a single Agulhas ring named Astrid, formed in January 2000. The ring was clearly visible in the analysis of satellite altimetry data, and surface drifters confirmed the anti-cyclonic rotation. During a detailed survey of this 2-month-old ring in March 2000, it appeared that the water mass properties of this ring only differed from the surrounding water above the 12°C isotherm. The observed fine-structure near its boundary suggested that exchange of water with its surroundings already had started. Observations with a lowered acoustic Doppler current profiler showed that the ring had a significant barotropic component, additional to the baroclinic flow around its warm centre. Meteorological observations indicated that during the summer survey the ring was losing heat to the atmosphere. This heat loss maintained convective mixing in the surface mixed layer. Compared to other reported rings, Astrid had a very large kinetic energy, a property probably characteristic for very young Agulhas rings. In other aspects Astrid did not differ strongly from the other rings, although Astrid was slightly larger than their typical ‘average’ size.
0967-0645
167-195
van Aken, H.M.
2666f480-9f72-47ec-bbd9-794bce05d7c2
van Veldhoven, A.K.
d6074191-9b9e-4075-9ac1-4267031f47f6
Veth, C.
1d5ace8a-e242-48b7-98e6-4a11dc6c842e
de Ruijter, W.P.M.
85dd535e-71a9-4397-b3d7-b1c61dfd9758
van Leeuwen, P.J.
52371b83-1a99-4b6d-9c80-757a379a9bb3
Drijfhout, S.S.
a5c76079-179b-490c-93fe-fc0391aacf13
Whittle, C.P.
4ffbcd2f-3ce9-4ccc-accd-d39c0d21fab2
Rouault, M.
4faecfa6-9d94-4934-aab8-bec79b5eace9
van Aken, H.M.
2666f480-9f72-47ec-bbd9-794bce05d7c2
van Veldhoven, A.K.
d6074191-9b9e-4075-9ac1-4267031f47f6
Veth, C.
1d5ace8a-e242-48b7-98e6-4a11dc6c842e
de Ruijter, W.P.M.
85dd535e-71a9-4397-b3d7-b1c61dfd9758
van Leeuwen, P.J.
52371b83-1a99-4b6d-9c80-757a379a9bb3
Drijfhout, S.S.
a5c76079-179b-490c-93fe-fc0391aacf13
Whittle, C.P.
4ffbcd2f-3ce9-4ccc-accd-d39c0d21fab2
Rouault, M.
4faecfa6-9d94-4934-aab8-bec79b5eace9

van Aken, H.M., van Veldhoven, A.K., Veth, C., de Ruijter, W.P.M., van Leeuwen, P.J., Drijfhout, S.S., Whittle, C.P. and Rouault, M. (2003) Observations of a young Agulhas ring, Astrid, during MARE in March 2000. Deep Sea Research Part II: Topical Studies in Oceanography, 50 (1), 167-195. (doi:10.1016/S0967-0645(02)00383-1).

Record type: Article

Abstract

The MARE project studies the effects of inter-ocean exchange between the Indian and Atlantic Ocean, via Agulhas rings, on the Atlantic meridional overturning circulation. The field programme of MARE concentrates on the study of the decay and modification of a single Agulhas ring named Astrid, formed in January 2000. The ring was clearly visible in the analysis of satellite altimetry data, and surface drifters confirmed the anti-cyclonic rotation. During a detailed survey of this 2-month-old ring in March 2000, it appeared that the water mass properties of this ring only differed from the surrounding water above the 12°C isotherm. The observed fine-structure near its boundary suggested that exchange of water with its surroundings already had started. Observations with a lowered acoustic Doppler current profiler showed that the ring had a significant barotropic component, additional to the baroclinic flow around its warm centre. Meteorological observations indicated that during the summer survey the ring was losing heat to the atmosphere. This heat loss maintained convective mixing in the surface mixed layer. Compared to other reported rings, Astrid had a very large kinetic energy, a property probably characteristic for very young Agulhas rings. In other aspects Astrid did not differ strongly from the other rings, although Astrid was slightly larger than their typical ‘average’ size.

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Published date: January 2003
Organisations: Ocean and Earth Science

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Local EPrints ID: 349174
URI: http://eprints.soton.ac.uk/id/eprint/349174
ISSN: 0967-0645
PURE UUID: c4aa9050-8011-42ae-ba9f-bb396a5c7d16

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Date deposited: 26 Feb 2013 11:25
Last modified: 08 Jan 2022 12:03

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Contributors

Author: H.M. van Aken
Author: A.K. van Veldhoven
Author: C. Veth
Author: W.P.M. de Ruijter
Author: P.J. van Leeuwen
Author: S.S. Drijfhout
Author: C.P. Whittle
Author: M. Rouault

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