Current and productivity patterns in the equatorial Pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients

Radiolarians were studied in 11 box-cores retrieved in the western (160°E), central (135°W) and eastern (90°W) equatorial Pacific. The western and central cores span the last ca. 40 000 yrs, while the eatern core is estimated to reach approx. 12 000-17 000 yrs. Time-average data show very sharp asse...

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Autor principal: Boltovskoy, D.
Formato: JOUR
Materias:
currents
downcore faunal gradients
faunal gradient
Last Glacial Maximum
palaeoceanography
productivity
productivity pattern
radiolaria
radiolarian
(Equatorial)
Pacific
Radiolaria (protozoans)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00262803_v38_n4_p397_Boltovskoy
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00262803_v38_n4_p397_Boltovskoy
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spelling todo:paper_00262803_v38_n4_p397_Boltovskoy2023-10-03T14:37:01Z Current and productivity patterns in the equatorial Pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients Boltovskoy, D. currents downcore faunal gradients faunal gradient Last Glacial Maximum palaeoceanography productivity productivity pattern radiolaria radiolarian (Equatorial) Pacific Radiolaria (protozoans) Radiolarians were studied in 11 box-cores retrieved in the western (160°E), central (135°W) and eastern (90°W) equatorial Pacific. The western and central cores span the last ca. 40 000 yrs, while the eatern core is estimated to reach approx. 12 000-17 000 yrs. Time-average data show very sharp assemblage composition difference between the three locales. Species dominant at the western most sites are indicative of warm, oligotrophic conditions; than atocoenoses from 135°W suggest strong input of California Current radiolarians; while the easternmost core hosts assemblages which point to a significant influence of the Peru Current. In the central and eastern parts of the equatorial Pacific belt, radiolarian distributional patterns in the sediments and their shifts during the last millennia respond chiefly to environmental conditions at depths in excess of 50 m (rather than to sea surface temperature), and to subsurface and deep lateral advection of shells from eastern boundary current areas. -from Author Fil:Boltovskoy, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00262803_v38_n4_p397_Boltovskoy
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic currents
downcore faunal gradients
faunal gradient
Last Glacial Maximum
palaeoceanography
productivity
productivity pattern
radiolaria
radiolarian
(Equatorial)
Pacific
Radiolaria (protozoans)
spellingShingle currents
downcore faunal gradients
faunal gradient
Last Glacial Maximum
palaeoceanography
productivity
productivity pattern
radiolaria
radiolarian
(Equatorial)
Pacific
Radiolaria (protozoans)
Boltovskoy, D.
Current and productivity patterns in the equatorial Pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients
topic_facet currents
downcore faunal gradients
faunal gradient
Last Glacial Maximum
palaeoceanography
productivity
productivity pattern
radiolaria
radiolarian
(Equatorial)
Pacific
Radiolaria (protozoans)
description Radiolarians were studied in 11 box-cores retrieved in the western (160°E), central (135°W) and eastern (90°W) equatorial Pacific. The western and central cores span the last ca. 40 000 yrs, while the eatern core is estimated to reach approx. 12 000-17 000 yrs. Time-average data show very sharp assemblage composition difference between the three locales. Species dominant at the western most sites are indicative of warm, oligotrophic conditions; than atocoenoses from 135°W suggest strong input of California Current radiolarians; while the easternmost core hosts assemblages which point to a significant influence of the Peru Current. In the central and eastern parts of the equatorial Pacific belt, radiolarian distributional patterns in the sediments and their shifts during the last millennia respond chiefly to environmental conditions at depths in excess of 50 m (rather than to sea surface temperature), and to subsurface and deep lateral advection of shells from eastern boundary current areas. -from Author
format JOUR
author Boltovskoy, D.
author_facet Boltovskoy, D.
author_sort Boltovskoy, D.
title Current and productivity patterns in the equatorial Pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients
title_short Current and productivity patterns in the equatorial Pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients
title_full Current and productivity patterns in the equatorial Pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients
title_fullStr Current and productivity patterns in the equatorial Pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients
title_full_unstemmed Current and productivity patterns in the equatorial Pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients
title_sort current and productivity patterns in the equatorial pacific across the last glacial maxium based on radiolarian east-west and downcore faunal gradients
url http://hdl.handle.net/20.500.12110/paper_00262803_v38_n4_p397_Boltovskoy
work_keys_str_mv AT boltovskoyd currentandproductivitypatternsintheequatorialpacificacrossthelastglacialmaxiumbasedonradiolarianeastwestanddowncorefaunalgradients
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