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Tracking the Recent and late Pleistocene Azores front by the distribution of planktic foraminifers

Tracking the Recent and late Pleistocene Azores front by the distribution of planktic foraminifers
Tracking the Recent and late Pleistocene Azores front by the distribution of planktic foraminifers
South of the Azores Islands, the population dynamics and sedimentation of planktic foraminifers are significantly influenced by the hydrography of the Azores Front Current System (AFCS). Planktic foraminifers collected from the water column during seasonal cruises across the Azores Front, record the temporal and spatial scale of hydrographic and faunal dynamics within this area. Surface sediment analysis reveals the presence of a large number of pteropod shells indicating preservation of aragonite and, therefore, little alteration of the calcitic foraminiferal tests. Consequently, most of the seasonal and spatial variability of the Azores Front is expected to be recorded by the planktic foraminiferal assemblages present within the surface sediment. In particular, Globorotalia scitula, a subsurface-dwelling species, decreases significantly in abundance to the south of the Azores Front, and shows fine-scale changes at the glacial/interglacial time scale. Enhanced faunal proportions of G. scitula in a sediment core that is located to the south of the modern Azores Current indicate a southward shift of the Azores Front Current System during the glacials and the presence of a transitional water mass at the Azores region.
Micropalaeontology, Faunal analysis, Planktic foraminifers, Lysocline, Oceanic fronts, Paleoceanography, North Atlantic, Azores
0924-7963
213-227
Schiebel, R.
e3ee9c3f-ae96-4523-8ec2-2ed7acdfb83a
Schmuker, B.
f0fae431-e4b8-49f2-b242-3d1483b095fb
Alves, M.
a1d7da02-59e3-4336-8aa2-af22cc7f2e14
Hemleben, C.
0f45ede4-dfec-457e-8a64-b96a5b8c71f0
Schiebel, R.
e3ee9c3f-ae96-4523-8ec2-2ed7acdfb83a
Schmuker, B.
f0fae431-e4b8-49f2-b242-3d1483b095fb
Alves, M.
a1d7da02-59e3-4336-8aa2-af22cc7f2e14
Hemleben, C.
0f45ede4-dfec-457e-8a64-b96a5b8c71f0

Schiebel, R., Schmuker, B., Alves, M. and Hemleben, C. (2002) Tracking the Recent and late Pleistocene Azores front by the distribution of planktic foraminifers. Journal of Marine Systems, 37 (1-3), 213-227. (doi:10.1016/S0924-7963(02)00203-8).

Record type: Article

Abstract

South of the Azores Islands, the population dynamics and sedimentation of planktic foraminifers are significantly influenced by the hydrography of the Azores Front Current System (AFCS). Planktic foraminifers collected from the water column during seasonal cruises across the Azores Front, record the temporal and spatial scale of hydrographic and faunal dynamics within this area. Surface sediment analysis reveals the presence of a large number of pteropod shells indicating preservation of aragonite and, therefore, little alteration of the calcitic foraminiferal tests. Consequently, most of the seasonal and spatial variability of the Azores Front is expected to be recorded by the planktic foraminiferal assemblages present within the surface sediment. In particular, Globorotalia scitula, a subsurface-dwelling species, decreases significantly in abundance to the south of the Azores Front, and shows fine-scale changes at the glacial/interglacial time scale. Enhanced faunal proportions of G. scitula in a sediment core that is located to the south of the modern Azores Current indicate a southward shift of the Azores Front Current System during the glacials and the presence of a transitional water mass at the Azores region.

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More information

Published date: 2002
Keywords: Micropalaeontology, Faunal analysis, Planktic foraminifers, Lysocline, Oceanic fronts, Paleoceanography, North Atlantic, Azores

Identifiers

Local EPrints ID: 35586
URI: http://eprints.soton.ac.uk/id/eprint/35586
ISSN: 0924-7963
PURE UUID: 67dfb59e-e982-4344-a183-6e6edb3889f4

Catalogue record

Date deposited: 22 May 2006
Last modified: 09 Nov 2021 08:00

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Contributors

Author: R. Schiebel
Author: B. Schmuker
Author: M. Alves
Author: C. Hemleben

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