Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers

Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers

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13 pages, 7 figures, 2 tables.-- Printed version published Mar 10, 2005.

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Main Authors: Álvarez, M. C., Flores, José Abel, Sierro, Francisco Javier, Diz, P., Francés, Guillermo, Pelejero, Carles, Grimalt, Joan O.
Format: artículo biblioteca
Language:English
Published: Elsevier 2005-02-02
Subjects:North Atlantic, Ría de Vigo, Coccoliths, Coccolithophores, Molecular biomarkers, Alkenones, Holocene, Hypsithermal, North Atlantic Oscillation,
Online Access:http://hdl.handle.net/10261/15521
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spelling dig-icm-es-10261-155212022-10-11T09:49:33Z Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers Álvarez, M. C. Flores, José Abel Sierro, Francisco Javier Diz, P. Francés, Guillermo Pelejero, Carles Grimalt, Joan O. North Atlantic Ría de Vigo Coccoliths Coccolithophores Molecular biomarkers Alkenones Holocene Hypsithermal North Atlantic Oscillation 13 pages, 7 figures, 2 tables.-- Printed version published Mar 10, 2005. A combined study of coccolith assemblages and biomarkers in a gravity core collected from the Ría de Vigo (NW Spain) allowed us to reconstruct the paleoenvironmental conditions for the last 3000 years. The quantitative distribution of coccolithophore species points to three different intervals within the core, dated by AMS radiocarbon measurements. The first interval (ca. 975 BC–252 AD), characterized by high abundances of Calcidiscus leptoporus and Gephyrocapsa muellerae, is thought to represent moderate water temperatures, suggesting a transition from a warmer to a cooler period. The second interval (ca. 252–1368 AD), characterized by the dominance of Coccolithus pelagicus, Helicosphaera carteri and Syracosphaera spp., and a high concentration of hexacosanol linked to terrestrial input, is interpreted as having been a humid period with fluvial input. The third interval (ca. 1368 AD–1950) is characterized by a high abundance of Gephyrocapsa oceanica, high alkenone values and low values of hexacosanol, and is thought to represent a period dominated by oceanic conditions within the Ría. Taking into account the ocean–atmospheric system affecting the region studied, here we propose an alternation in the mean state of North Atlantic Oscillation (NAO) at millennial time scales. A well-developed upwelling system and an active Ría–ocean connection during the warmer interval I suggest a NAO+ phase influenced by a Hypsithermal period. The occurrence of the humid and relatively warm interval II is consistent with a negative phase in the NAO, as well as a relative restriction in ocean–Ría exchange. Interval III, which was drier and more productive, again suggests the dominance of a positive phase in the NAO, with a more intense oceanic connection and more energized upwelling. Research grants ABRUMIS REN2003-08642-C02-02/CLI, BTE2002-04670 (Ministerio de Ciencia y Tecnología) and SA088/04 (Junta de Castilla y León) supported this study. Peer reviewed 2009-07-30T10:01:39Z 2009-07-30T10:01:39Z 2005-02-02 artículo http://purl.org/coar/resource_type/c_6501 Palaeogeography, Palaeoclimatology, Palaeoecology 218(1): 1-13 (2005) 0031-0182 http://hdl.handle.net/10261/15521 10.1016/j.palaeo.2004.12.002 en http://dx.doi.org/10.1016/j.palaeo.2004.12.002 Sí open 22195 bytes application/pdf Elsevier
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic North Atlantic
Ría de Vigo
Coccoliths
Coccolithophores
Molecular biomarkers
Alkenones
Holocene
Hypsithermal
North Atlantic Oscillation
North Atlantic
Ría de Vigo
Coccoliths
Coccolithophores
Molecular biomarkers
Alkenones
Holocene
Hypsithermal
North Atlantic Oscillation
spellingShingle North Atlantic
Ría de Vigo
Coccoliths
Coccolithophores
Molecular biomarkers
Alkenones
Holocene
Hypsithermal
North Atlantic Oscillation
North Atlantic
Ría de Vigo
Coccoliths
Coccolithophores
Molecular biomarkers
Alkenones
Holocene
Hypsithermal
North Atlantic Oscillation
Álvarez, M. C.
Flores, José Abel
Sierro, Francisco Javier
Diz, P.
Francés, Guillermo
Pelejero, Carles
Grimalt, Joan O.
Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers
description 13 pages, 7 figures, 2 tables.-- Printed version published Mar 10, 2005.
format artículo
topic_facet North Atlantic
Ría de Vigo
Coccoliths
Coccolithophores
Molecular biomarkers
Alkenones
Holocene
Hypsithermal
North Atlantic Oscillation
author Álvarez, M. C.
Flores, José Abel
Sierro, Francisco Javier
Diz, P.
Francés, Guillermo
Pelejero, Carles
Grimalt, Joan O.
author_facet Álvarez, M. C.
Flores, José Abel
Sierro, Francisco Javier
Diz, P.
Francés, Guillermo
Pelejero, Carles
Grimalt, Joan O.
author_sort Álvarez, M. C.
title Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers
title_short Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers
title_full Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers
title_fullStr Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers
title_full_unstemmed Millennial surface water dynamics in the Ría de Vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers
title_sort millennial surface water dynamics in the ría de vigo during the last 3000 years as revealed by coccoliths and molecular biomarkers
publisher Elsevier
publishDate 2005-02-02
url http://hdl.handle.net/10261/15521
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