Planktonic foraminifera assemblage, MAT-derived sea surface temperature and Cibicides spp. oxygen isotopes
This study explores the mechanisms behind the high glacial productivity in the southern Brazilian margin during the last 70 kyr. Therefore, we use planktonic foraminifera assemblage and subsurface temperatures derived through the Modern Analogue Technique. We show that enhanced glacial productivity...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.902040 2024-09-15T18:30:56+00:00 Planktonic foraminifera assemblage, MAT-derived sea surface temperature and Cibicides spp. oxygen isotopes Portilho-Ramos, Rodrigo Costa Pinho, Tainã Marcos Lima Chiessi, Cristiano Mazur Barbosa, Catia F LATITUDE: -27.697170 * LONGITUDE: -46.494000 * DATE/TIME START: 1998-10-08T00:00:00 * DATE/TIME END: 1998-10-08T00:00:00 2019 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.902040 https://doi.org/10.1594/PANGAEA.902040 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.902040 https://doi.org/10.1594/PANGAEA.902040 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Portilho-Ramos, Rodrigo Costa; Pinho, Tainã Marcos Lima; Chiessi, Cristiano Mazur; Barbosa, Catia Fernandes (2019): Understanding the mechanisms behind high glacial productivity in the southern Brazilian margin. Climate of the Past, 15(3), 943-955, https://doi.org/10.5194/cp-15-943-2019 dataset publication series 2019 ftpangaea https://doi.org/10.1594/PANGAEA.90204010.5194/cp-15-943-2019 2024-07-24T02:31:21Z This study explores the mechanisms behind the high glacial productivity in the southern Brazilian margin during the last 70 kyr. Therefore, we use planktonic foraminifera assemblage and subsurface temperatures derived through the Modern Analogue Technique. We show that enhanced glacial productivity was driven by the synergy of two mechanisms operating in different seasons: (i) a high productivity upwelling during short austral summer events; and (ii) the persistent presence of the Plata Plume Water due to prolonged austral winter conditions. We suggest that the upwelling systems in the southern Brazilian margin were more productive during the last glacial period due to the enhanced Si supply for diatom production through high-Si thermocline waters preformed in the Southern Ocean. We hypothesize that orbital forcing did not have a major influence on changes in upwelling during the last glacial period. However, the more frequent northward intrusions of the Plata Plume Water were modulated by austral winter insolation at 65 °S through changes in the strength of alongshore SW-winds. After the Last Glacial Maximum, the reduced Si content of thermocline waters decreased upwelling productivity, while lower austral winter insolation decreased the influence of the Plata Plume Water over the southern Brazilian margin, reducing regional productivity. Other/Unknown Material Planktonic foraminifera Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-46.494000,-46.494000,-27.697170,-27.697170) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
This study explores the mechanisms behind the high glacial productivity in the southern Brazilian margin during the last 70 kyr. Therefore, we use planktonic foraminifera assemblage and subsurface temperatures derived through the Modern Analogue Technique. We show that enhanced glacial productivity was driven by the synergy of two mechanisms operating in different seasons: (i) a high productivity upwelling during short austral summer events; and (ii) the persistent presence of the Plata Plume Water due to prolonged austral winter conditions. We suggest that the upwelling systems in the southern Brazilian margin were more productive during the last glacial period due to the enhanced Si supply for diatom production through high-Si thermocline waters preformed in the Southern Ocean. We hypothesize that orbital forcing did not have a major influence on changes in upwelling during the last glacial period. However, the more frequent northward intrusions of the Plata Plume Water were modulated by austral winter insolation at 65 °S through changes in the strength of alongshore SW-winds. After the Last Glacial Maximum, the reduced Si content of thermocline waters decreased upwelling productivity, while lower austral winter insolation decreased the influence of the Plata Plume Water over the southern Brazilian margin, reducing regional productivity. |
format |
Other/Unknown Material |
author |
Portilho-Ramos, Rodrigo Costa Pinho, Tainã Marcos Lima Chiessi, Cristiano Mazur Barbosa, Catia F |
spellingShingle |
Portilho-Ramos, Rodrigo Costa Pinho, Tainã Marcos Lima Chiessi, Cristiano Mazur Barbosa, Catia F Planktonic foraminifera assemblage, MAT-derived sea surface temperature and Cibicides spp. oxygen isotopes |
author_facet |
Portilho-Ramos, Rodrigo Costa Pinho, Tainã Marcos Lima Chiessi, Cristiano Mazur Barbosa, Catia F |
author_sort |
Portilho-Ramos, Rodrigo Costa |
title |
Planktonic foraminifera assemblage, MAT-derived sea surface temperature and Cibicides spp. oxygen isotopes |
title_short |
Planktonic foraminifera assemblage, MAT-derived sea surface temperature and Cibicides spp. oxygen isotopes |
title_full |
Planktonic foraminifera assemblage, MAT-derived sea surface temperature and Cibicides spp. oxygen isotopes |
title_fullStr |
Planktonic foraminifera assemblage, MAT-derived sea surface temperature and Cibicides spp. oxygen isotopes |
title_full_unstemmed |
Planktonic foraminifera assemblage, MAT-derived sea surface temperature and Cibicides spp. oxygen isotopes |
title_sort |
planktonic foraminifera assemblage, mat-derived sea surface temperature and cibicides spp. oxygen isotopes |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.902040 https://doi.org/10.1594/PANGAEA.902040 |
op_coverage |
LATITUDE: -27.697170 * LONGITUDE: -46.494000 * DATE/TIME START: 1998-10-08T00:00:00 * DATE/TIME END: 1998-10-08T00:00:00 |
long_lat |
ENVELOPE(-46.494000,-46.494000,-27.697170,-27.697170) |
genre |
Planktonic foraminifera Southern Ocean |
genre_facet |
Planktonic foraminifera Southern Ocean |
op_source |
Supplement to: Portilho-Ramos, Rodrigo Costa; Pinho, Tainã Marcos Lima; Chiessi, Cristiano Mazur; Barbosa, Catia Fernandes (2019): Understanding the mechanisms behind high glacial productivity in the southern Brazilian margin. Climate of the Past, 15(3), 943-955, https://doi.org/10.5194/cp-15-943-2019 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.902040 https://doi.org/10.1594/PANGAEA.902040 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.90204010.5194/cp-15-943-2019 |
_version_ |
1810472498391678976 |