A new radiolarian transfer function for the Pacific Ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle
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 o...
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ftconicet:oai:ri.conicet.gov.ar:11336/162490 2023-10-09T21:50:21+02:00 A new radiolarian transfer function for the Pacific Ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle Hernández Almeida, Iván Boltovskoy, Demetrio Cortese, Giuseppe Kruglikova, Svetlana B. application/pdf http://hdl.handle.net/11336/162490 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/url/https://www.journals.elsevier.com/global-and-planetary-change info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gloplacha.2020.103186 http://hdl.handle.net/11336/162490 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 0921-8181 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ BASIN-WIDE MICROFOSSIL PALEOCLIMATE QUANTITATIVE CALIBRATION SEA-SURFACE TEMPERATURE TRAINING SET https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.gloplacha.2020.103186 2023-09-24T18:37:51Z 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 ... Article in Journal/Newspaper Bering Sea CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Bering Sea Pacific K5 ENVELOPE(24.794,24.794,67.805,67.805) Global and Planetary Change 190 103186 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
BASIN-WIDE MICROFOSSIL PALEOCLIMATE QUANTITATIVE CALIBRATION SEA-SURFACE TEMPERATURE TRAINING SET https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
BASIN-WIDE MICROFOSSIL PALEOCLIMATE QUANTITATIVE CALIBRATION SEA-SURFACE TEMPERATURE TRAINING SET https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 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 |
topic_facet |
BASIN-WIDE MICROFOSSIL PALEOCLIMATE QUANTITATIVE CALIBRATION SEA-SURFACE TEMPERATURE TRAINING SET https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
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 ... |
format |
Article in Journal/Newspaper |
author |
Hernández Almeida, Iván Boltovskoy, Demetrio Cortese, Giuseppe Kruglikova, Svetlana B. |
author_facet |
Hernández Almeida, Iván Boltovskoy, Demetrio Cortese, Giuseppe Kruglikova, Svetlana B. |
author_sort |
Hernández Almeida, Iván |
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 |
title_short |
A new radiolarian transfer function for the Pacific Ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle |
title_full |
A new radiolarian transfer function for the Pacific Ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle |
title_fullStr |
A new radiolarian transfer function for the Pacific Ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle |
title_full_unstemmed |
A new radiolarian transfer function for the Pacific Ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle |
title_sort |
new radiolarian transfer function for the pacific ocean and application to fossil records: assessing potential and limitations for the last glacial-interglacial cycle |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/162490 |
long_lat |
ENVELOPE(24.794,24.794,67.805,67.805) |
geographic |
Bering Sea Pacific K5 |
geographic_facet |
Bering Sea Pacific K5 |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://www.journals.elsevier.com/global-and-planetary-change info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gloplacha.2020.103186 http://hdl.handle.net/11336/162490 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 0921-8181 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.gloplacha.2020.103186 |
container_title |
Global and Planetary Change |
container_volume |
190 |
container_start_page |
103186 |
_version_ |
1779313395692994560 |