Respuesta del registro sedimentario a la ciclicidad solar en el estrecho de Gerlache (península Antártica)
38ª Sesión Científica, 2005, Teruel.-- 4 pages, 3 figures, 1 table The Gerlache Strait (Antarctic Peninsula) is a semi-enclosed basin that acts as a giant sedimentary trap collecting large amounts of material. Previous biogenic and glacial deposits are the main suppliers of sediments. The basin is a...
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Sociedad Geológica de España
2005
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ftcsic:oai:digital.csic.es:10261/134224 2024-02-11T09:58:30+01:00 Respuesta del registro sedimentario a la ciclicidad solar en el estrecho de Gerlache (península Antártica) Sedimentary response to Solar Cyclicity in the Gerlache Strait (Antartic Peninsula) Bárcena, María Ángeles Sesma, J. Isla, Enrique Palanques, Albert 2005 http://hdl.handle.net/10261/134224 unknown Sociedad Geológica de España http://www.sociedadgeologica.es/publicaciones/geogaceta/2005_38.html Sí issn: 0213-683X Geogaceta 38: 179-182 (2005) http://hdl.handle.net/10261/134224 none Holocene Gerlache Basin Diatoms Geochemistry Sunspot cyclicity artículo http://purl.org/coar/resource_type/c_6501 2005 ftcsic 2024-01-16T10:16:14Z 38ª Sesión Científica, 2005, Teruel.-- 4 pages, 3 figures, 1 table The Gerlache Strait (Antarctic Peninsula) is a semi-enclosed basin that acts as a giant sedimentary trap collecting large amounts of material. Previous biogenic and glacial deposits are the main suppliers of sediments. The basin is also an area of high sea-surface productivity, mostly restricted to the summer months of December and January. In this study we present micropaleontological and geochemical data obtained from a set of foursediment cores obtained by the Spanish research vessel Hespérides during the Fruela-96 expedition. Thecores were collected using a multiple corer allowing recovery of up to eight replicates, with core lengths ranging between 32 and 34 cm. The stratigraphic framework of the cores, based in 210Pb activity, shows that there has been a continuous sedimentation in the sites during the last 220 years BP. The diatom assemblage varies between absolute values of 0.9 to 240 x 108 valves/g of dry sediment. Chaetoceros RS are the main contributor showing values from 66 to 90 %. The Thalassiosira antarctica/scotia group and Sea-ice taxa, mainly Fragilariopsis curta, are secondary contributors. The total abundance of diatoms and the content of biogenic silica are interpreted as paleoproductivity proxies. In this sense, a progressive reduction in paleoproductivity is observed towards the core top, with a sharp minimum around 100 yr B.P. Moreover an increase of Sea-ice Taxa is observed for the last 100 yr. These changes could be related to the onset of a neoglacial event during this period. In order to evaluate the cyclicity record, Spectral analyses (Multi-Tapered Method) were performed on different parameters (TOC, Opal, total diatom abundance, Sea-ice Taxa and T. antarctica). The time series study shows two main types of cyclicities, 80-90 and 20-30 years in two cores, G4 and G5, both recovered from central Gerlache Strait. This cyclicity seems to be in agreement with the Hale (22 years) and the Gleissberg (83 years) Solar ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica antartic* Antártica Sea ice Digital.CSIC (Spanish National Research Council) Antarctic Antarctic Peninsula De Gerlache ENVELOPE(-62.333,-62.333,-64.500,-64.500) Estrecho ENVELOPE(-60.783,-60.783,-62.467,-62.467) Estrecho De Gerlache ENVELOPE(-62.333,-62.333,-64.500,-64.500) Gerlache ENVELOPE(99.033,99.033,-66.500,-66.500) Gerlache Strait ENVELOPE(-62.333,-62.333,-64.500,-64.500) Hale ENVELOPE(-86.317,-86.317,-78.067,-78.067) |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Holocene Gerlache Basin Diatoms Geochemistry Sunspot cyclicity |
spellingShingle |
Holocene Gerlache Basin Diatoms Geochemistry Sunspot cyclicity Bárcena, María Ángeles Sesma, J. Isla, Enrique Palanques, Albert Respuesta del registro sedimentario a la ciclicidad solar en el estrecho de Gerlache (península Antártica) |
topic_facet |
Holocene Gerlache Basin Diatoms Geochemistry Sunspot cyclicity |
description |
38ª Sesión Científica, 2005, Teruel.-- 4 pages, 3 figures, 1 table The Gerlache Strait (Antarctic Peninsula) is a semi-enclosed basin that acts as a giant sedimentary trap collecting large amounts of material. Previous biogenic and glacial deposits are the main suppliers of sediments. The basin is also an area of high sea-surface productivity, mostly restricted to the summer months of December and January. In this study we present micropaleontological and geochemical data obtained from a set of foursediment cores obtained by the Spanish research vessel Hespérides during the Fruela-96 expedition. Thecores were collected using a multiple corer allowing recovery of up to eight replicates, with core lengths ranging between 32 and 34 cm. The stratigraphic framework of the cores, based in 210Pb activity, shows that there has been a continuous sedimentation in the sites during the last 220 years BP. The diatom assemblage varies between absolute values of 0.9 to 240 x 108 valves/g of dry sediment. Chaetoceros RS are the main contributor showing values from 66 to 90 %. The Thalassiosira antarctica/scotia group and Sea-ice taxa, mainly Fragilariopsis curta, are secondary contributors. The total abundance of diatoms and the content of biogenic silica are interpreted as paleoproductivity proxies. In this sense, a progressive reduction in paleoproductivity is observed towards the core top, with a sharp minimum around 100 yr B.P. Moreover an increase of Sea-ice Taxa is observed for the last 100 yr. These changes could be related to the onset of a neoglacial event during this period. In order to evaluate the cyclicity record, Spectral analyses (Multi-Tapered Method) were performed on different parameters (TOC, Opal, total diatom abundance, Sea-ice Taxa and T. antarctica). The time series study shows two main types of cyclicities, 80-90 and 20-30 years in two cores, G4 and G5, both recovered from central Gerlache Strait. This cyclicity seems to be in agreement with the Hale (22 years) and the Gleissberg (83 years) Solar ... |
format |
Article in Journal/Newspaper |
author |
Bárcena, María Ángeles Sesma, J. Isla, Enrique Palanques, Albert |
author_facet |
Bárcena, María Ángeles Sesma, J. Isla, Enrique Palanques, Albert |
author_sort |
Bárcena, María Ángeles |
title |
Respuesta del registro sedimentario a la ciclicidad solar en el estrecho de Gerlache (península Antártica) |
title_short |
Respuesta del registro sedimentario a la ciclicidad solar en el estrecho de Gerlache (península Antártica) |
title_full |
Respuesta del registro sedimentario a la ciclicidad solar en el estrecho de Gerlache (península Antártica) |
title_fullStr |
Respuesta del registro sedimentario a la ciclicidad solar en el estrecho de Gerlache (península Antártica) |
title_full_unstemmed |
Respuesta del registro sedimentario a la ciclicidad solar en el estrecho de Gerlache (península Antártica) |
title_sort |
respuesta del registro sedimentario a la ciclicidad solar en el estrecho de gerlache (península antártica) |
publisher |
Sociedad Geológica de España |
publishDate |
2005 |
url |
http://hdl.handle.net/10261/134224 |
long_lat |
ENVELOPE(-62.333,-62.333,-64.500,-64.500) ENVELOPE(-60.783,-60.783,-62.467,-62.467) ENVELOPE(-62.333,-62.333,-64.500,-64.500) ENVELOPE(99.033,99.033,-66.500,-66.500) ENVELOPE(-62.333,-62.333,-64.500,-64.500) ENVELOPE(-86.317,-86.317,-78.067,-78.067) |
geographic |
Antarctic Antarctic Peninsula De Gerlache Estrecho Estrecho De Gerlache Gerlache Gerlache Strait Hale |
geographic_facet |
Antarctic Antarctic Peninsula De Gerlache Estrecho Estrecho De Gerlache Gerlache Gerlache Strait Hale |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica antartic* Antártica Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica antartic* Antártica Sea ice |
op_relation |
http://www.sociedadgeologica.es/publicaciones/geogaceta/2005_38.html Sí issn: 0213-683X Geogaceta 38: 179-182 (2005) http://hdl.handle.net/10261/134224 |
op_rights |
none |
_version_ |
1790594150060523520 |