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dc.contributor.author
Hernández Almeida, Iván
dc.contributor.author
Boltovskoy, Demetrio
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dc.contributor.author
Cortese, Giuseppe
dc.contributor.author
Kruglikova, Svetlana B.
dc.date.available
2022-07-19T13:36:33Z
dc.date.issued
2020-04
dc.identifier.citation
Hernández Almeida, Iván; Boltovskoy, Demetrio; Cortese, Giuseppe; Kruglikova, Svetlana B.; A new radiolarian transfer function for the Pacific Ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle; Elsevier Science; Global and Planetary Change; 190; 103186; 4-2020; 1-17
dc.identifier.issn
0921-8181
dc.identifier.uri
http://hdl.handle.net/11336/162490
dc.description.abstract
Climatic and oceanographic processes in the Pacific Ocean have global implications. Reliable sedimentary proxies in this region are thus necessary to understand the magnitude of past climate variability. Radiolarian assemblages are of particular relevance in some regions of the Pacific Ocean where other proxies are either poorly preserved or are biased towards a specific season. Previously published radiolarian-based transfer functions in the Pacific Ocean did not cover some regions, such as the Western Pacific marginal seas or high-latitude Southwestern Pacific. Filling these gaps in sample distribution and using a thorough methodology for finding the most important variable for radiolarian assemblages in surface sediment are both essential steps in quantitative studies. In this study, we use published radiolarian census counts from 801 core-tops distributed across the Pacific Ocean, to investigate which environmental factors drive the assemblages. We harmonized taxonomically the modern dataset, and using 27 multivariate statistical analyses, we determined that sea surface temperature at 10 m (SST10) is the most important variable influencing the changes observed in the radiolarian assemblages. The calibration method weighted-mean modern analogue technique with five analogs (WMAT-K5) corrected for autocorrelation using a cut-off distance of 500 km, showed a performance of R2 cv= 0.83; RMSEP= 3.8ᵒC. This calibration method was then applied to taxonomically harmonized radiolarian census counts from 31 cores located in the Bering Sea, Western Pacific marginal seas, and Southwest and Eastern Equatorial Pacific, with some of these records covering at least the last 165 ka. We assessed the analogue quality and significance of the downcore SST10 reconstructions in all of them. We found that temperatures at 10 and 200 m were the most significant variables for the fossil assemblages. Finally, we compare the temperature reconstructions to previously published radiolarian-based SST estimates for the same cores, or to other SST records based on other methodologies. We find some differences between our new temperature estimates compared to existing ones, in particular in the Eastern Equatorial Pacific. Comparison to other methods in the Japan and Bering Sea and Sea of Okhotsk show that radiolarian-based reconstructions provide robust temperature estimates compared to biogeochemical methods, which showed SST overestimation during glacial periods.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BASIN-WIDE
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MICROFOSSIL
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PALEOCLIMATE
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QUANTITATIVE CALIBRATION
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SEA-SURFACE TEMPERATURE
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TRAINING SET
dc.subject.classification
Ecología
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
A new radiolarian transfer function for the Pacific Ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-09-07T18:24:47Z
dc.journal.volume
190
dc.journal.number
103186
dc.journal.pagination
1-17
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Hernández Almeida, Iván. Eidgenössische Technische Hochschule Zürich; Suiza
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Fil: Boltovskoy, Demetrio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina
dc.description.fil
Fil: Cortese, Giuseppe. Institute of Geological and Nuclear Sciencies; Nueva Zelanda
dc.description.fil
Fil: Kruglikova, Svetlana B.. Russian Academy of Sciences; Rusia
dc.journal.title
Global and Planetary Change
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.journals.elsevier.com/global-and-planetary-change
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.gloplacha.2020.103186
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