Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance
[EN] Geochemical analysis, micropalaeontological analysis and radiometric dating techniques were performed on four gravity cores, G-1, G-2, A-3 and A-6, recovered during the BIO Hesperides expeditions GEBRA-93 and FRUELA-96 from the Bransfield Strait (Antarctica). Moreover, in order to improve the s...
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Language: | English |
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Consejo Superior de Investigaciones Científicas (España)
2006
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Online Access: | http://hdl.handle.net/10261/2360 https://doi.org/10.3989/scimar.2006.70n4607 |
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ftcsic:oai:digital.csic.es:10261/2360 2024-02-11T09:57:14+01:00 Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance Eventos neoglaciales del Holoceno en el Estrecho de Bransfield (Antártida). Significado paleoceanográfico y paleoclimático Bárcena, María Ángeles Fabrés, Joan Isla, Enrique Flores, José Abel Sierro, Francisco Javier Canals, Miquel Palanques, Albert 2006-12-30 http://hdl.handle.net/10261/2360 https://doi.org/10.3989/scimar.2006.70n4607 en eng Consejo Superior de Investigaciones Científicas (España) https://doi.org/10.3989/scimar.2006.70n4607 Scientia Marina 70(4): 607-619 (2006) 0214-8358 http://hdl.handle.net/10261/2360 doi:10.3989/scimar.2006.70n4607 1886-8134 open Diatoms Geochemistry Neoglacial events Palaeoceanography Palaeoclimatology Holocene Bransfield Strait Antarctica Diatomeas Geoquímica Paleoceanografía Paleoclimatología Holoceno Estrecho de Bransfield Antártida Eventos neoglaciales artículo http://purl.org/coar/resource_type/c_6501 2006 ftcsic https://doi.org/10.3989/scimar.2006.70n4607 2024-01-16T09:18:40Z [EN] Geochemical analysis, micropalaeontological analysis and radiometric dating techniques were performed on four gravity cores, G-1, G-2, A-3 and A-6, recovered during the BIO Hesperides expeditions GEBRA-93 and FRUELA-96 from the Bransfield Strait (Antarctica). Moreover, in order to improve the sedimentation rate control we tentatively relate abundance variations in the sea-ice taxa group (SITG) to air temperature estimations based on Deuterium contents in Vostok ice-core. The results of diatom analyses were related to the sequence of neoglacial events that have occurred over the last three millennia. For these periods, a restricted communication between the Weddell, Bransfield and Bellingshausen seas has been proposed. The abundance patterns of diatom valves, resting spores (RS) of the diatom Chaetoceros and opal content agree with the high productivity values previously reported for the area. The significant reduction Chaetoceros RS towards the present is interpreted as a reduction in surface productivity. Trend differences between Chaetoceros RS and TOC contents are explained in terms of organic matter preservation. Diatom communities from the Bransfield Strait did not play an important role in the global CO2 cycle during cold periods. Bio- and geochemical changes have overprinted high frequency cyclicity at about 200-300 yr, which might be related to the 200-yr solar cycle. [ES] Se han realizado análisis geoquímicos y micropaleontológicos, así como técnicas de datación radiométricas sobre cuatro testigos de gravedad (G-1, G2, A-3 y A-6) recuperados durante las campañas del BIO Hespérides Gebra-93 y Fruela-96 en el Estrecho de Bransfield (Antártida). Se han correlacionado las estimaciones de temperatura del aire, derivadas del contenido en Deuterio en el testigo de hielo Vostok, con la abundancia del grupo de taxones de mar helado (SITG). Los resultados obtenidos del análisis de diatomeas han sido relacionados con la secuencia de eventos neoglaciales que tuvieron lugar durante los últimos 3000 años. Se ... Article in Journal/Newspaper Antarc* Antarctica Antártida Bransfield Strait ice core Sea ice Digital.CSIC (Spanish National Research Council) Bransfield Strait Estrecho ENVELOPE(-60.783,-60.783,-62.467,-62.467) Hielo ENVELOPE(-58.133,-58.133,-62.083,-62.083) Weddell Scientia Marina 70 4 607 619 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Diatoms Geochemistry Neoglacial events Palaeoceanography Palaeoclimatology Holocene Bransfield Strait Antarctica Diatomeas Geoquímica Paleoceanografía Paleoclimatología Holoceno Estrecho de Bransfield Antártida Eventos neoglaciales |
spellingShingle |
Diatoms Geochemistry Neoglacial events Palaeoceanography Palaeoclimatology Holocene Bransfield Strait Antarctica Diatomeas Geoquímica Paleoceanografía Paleoclimatología Holoceno Estrecho de Bransfield Antártida Eventos neoglaciales Bárcena, María Ángeles Fabrés, Joan Isla, Enrique Flores, José Abel Sierro, Francisco Javier Canals, Miquel Palanques, Albert Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance |
topic_facet |
Diatoms Geochemistry Neoglacial events Palaeoceanography Palaeoclimatology Holocene Bransfield Strait Antarctica Diatomeas Geoquímica Paleoceanografía Paleoclimatología Holoceno Estrecho de Bransfield Antártida Eventos neoglaciales |
description |
[EN] Geochemical analysis, micropalaeontological analysis and radiometric dating techniques were performed on four gravity cores, G-1, G-2, A-3 and A-6, recovered during the BIO Hesperides expeditions GEBRA-93 and FRUELA-96 from the Bransfield Strait (Antarctica). Moreover, in order to improve the sedimentation rate control we tentatively relate abundance variations in the sea-ice taxa group (SITG) to air temperature estimations based on Deuterium contents in Vostok ice-core. The results of diatom analyses were related to the sequence of neoglacial events that have occurred over the last three millennia. For these periods, a restricted communication between the Weddell, Bransfield and Bellingshausen seas has been proposed. The abundance patterns of diatom valves, resting spores (RS) of the diatom Chaetoceros and opal content agree with the high productivity values previously reported for the area. The significant reduction Chaetoceros RS towards the present is interpreted as a reduction in surface productivity. Trend differences between Chaetoceros RS and TOC contents are explained in terms of organic matter preservation. Diatom communities from the Bransfield Strait did not play an important role in the global CO2 cycle during cold periods. Bio- and geochemical changes have overprinted high frequency cyclicity at about 200-300 yr, which might be related to the 200-yr solar cycle. [ES] Se han realizado análisis geoquímicos y micropaleontológicos, así como técnicas de datación radiométricas sobre cuatro testigos de gravedad (G-1, G2, A-3 y A-6) recuperados durante las campañas del BIO Hespérides Gebra-93 y Fruela-96 en el Estrecho de Bransfield (Antártida). Se han correlacionado las estimaciones de temperatura del aire, derivadas del contenido en Deuterio en el testigo de hielo Vostok, con la abundancia del grupo de taxones de mar helado (SITG). Los resultados obtenidos del análisis de diatomeas han sido relacionados con la secuencia de eventos neoglaciales que tuvieron lugar durante los últimos 3000 años. Se ... |
format |
Article in Journal/Newspaper |
author |
Bárcena, María Ángeles Fabrés, Joan Isla, Enrique Flores, José Abel Sierro, Francisco Javier Canals, Miquel Palanques, Albert |
author_facet |
Bárcena, María Ángeles Fabrés, Joan Isla, Enrique Flores, José Abel Sierro, Francisco Javier Canals, Miquel Palanques, Albert |
author_sort |
Bárcena, María Ángeles |
title |
Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance |
title_short |
Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance |
title_full |
Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance |
title_fullStr |
Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance |
title_full_unstemmed |
Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance |
title_sort |
holocene neoglacial events in the bransfield strait (antarctica). palaeocenographic and paleoclimatic significance |
publisher |
Consejo Superior de Investigaciones Científicas (España) |
publishDate |
2006 |
url |
http://hdl.handle.net/10261/2360 https://doi.org/10.3989/scimar.2006.70n4607 |
long_lat |
ENVELOPE(-60.783,-60.783,-62.467,-62.467) ENVELOPE(-58.133,-58.133,-62.083,-62.083) |
geographic |
Bransfield Strait Estrecho Hielo Weddell |
geographic_facet |
Bransfield Strait Estrecho Hielo Weddell |
genre |
Antarc* Antarctica Antártida Bransfield Strait ice core Sea ice |
genre_facet |
Antarc* Antarctica Antártida Bransfield Strait ice core Sea ice |
op_relation |
https://doi.org/10.3989/scimar.2006.70n4607 Scientia Marina 70(4): 607-619 (2006) 0214-8358 http://hdl.handle.net/10261/2360 doi:10.3989/scimar.2006.70n4607 1886-8134 |
op_rights |
open |
op_doi |
https://doi.org/10.3989/scimar.2006.70n4607 |
container_title |
Scientia Marina |
container_volume |
70 |
container_issue |
4 |
container_start_page |
607 |
op_container_end_page |
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