Middle Miocene temperature and productivity evolution at a Northeast Atlantic shelf site (IODP U1318, Porcupine Basin) : global and regional changes
We present a high-resolution multiproxy middle Miocene sea surface temperature (SST) and productivity (SSP) reconstruction of Integrated Ocean Drilling Program Site U1318, from the upper slope edge (similar to 400 m water depth) of the Porcupine Basin continental margin, eastern North Atlantic Ocean...
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2021
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ftunivgent:oai:archive.ugent.be:8732304 2023-12-24T10:08:50+01:00 Middle Miocene temperature and productivity evolution at a Northeast Atlantic shelf site (IODP U1318, Porcupine Basin) : global and regional changes Sangiorgi, Francesca Quaijtaal, Willemijn Donders, Timme H. Schouten, Stefan Louwye, Stephen 2021 application/pdf https://biblio.ugent.be/publication/8732304 http://hdl.handle.net/1854/LU-8732304 https://doi.org/10.1029/2020PA004059 https://biblio.ugent.be/publication/8732304/file/8732305 eng eng https://biblio.ugent.be/publication/8732304 http://hdl.handle.net/1854/LU-8732304 http://doi.org/10.1029/2020PA004059 https://biblio.ugent.be/publication/8732304/file/8732305 Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) info:eu-repo/semantics/openAccess PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY ISSN: 2572-4517 ISSN: 2572-4525 Earth and Environmental Sciences middle Miocene sea surface temperature sea surface productivity North Atlantic dinoflagellate cysts ANTARCTIC ICE-SHEET SEA-SURFACE TEMPERATURE DINOFLAGELLATE CYST ASSEMBLAGES ATMOSPHERIC CARBON-DIOXIDE ISOTOPE STRATIGRAPHY CLIMATIC TRANSITION TETRAETHER LIPIDS ORGANIC-MATTER SOUTHERN CALIBRATION journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftunivgent https://doi.org/10.1029/2020PA004059 2023-11-29T23:08:56Z We present a high-resolution multiproxy middle Miocene sea surface temperature (SST) and productivity (SSP) reconstruction of Integrated Ocean Drilling Program Site U1318, from the upper slope edge (similar to 400 m water depth) of the Porcupine Basin continental margin, eastern North Atlantic Ocean. Biomarker and dinoflagellate cyst proxies reveal warm and mostly stratified waters during the Miocene Climatic Optimum (MCO) that cooled similar to 3 degrees C across the Miocene Climate Transition (MCT). The organic biomarker (TEX86 and UK ' 37) paleothermometers document a series of 11 transient cooling events (CEs), superimposed on the long-term climate evolution. These CEs are associated with increases in cold-water dinocysts and correlate to global benthic delta O-18 shifts, including the Mi-2, Mi-3, and Mi-4 events. Most CEs are also associated with increases in primary productivity. A prolonged interval of high SSP between similar to 13.8 and 13.6 Ma supports the idea that carbon production (and burial) in shallow areas represents a feedback mechanism contributing to long-term atmospheric CO2 decline and cooling during the MCT. SST comparison in three North Atlantic sites (Azores Site 608, Porcupine Basin Site U1318, and Rockall Plateau Site 982) reveals that MCO SSTs are much warmer at Site 608 than at the other two sites. The low-resolution SST record of Site 982 shows no decrease in temperature around the MCT. This may be linked to contemporaneous tectonic changes in the Tethys, Central American, and Arctic Seaways impacting local ocean circulation, superimposed on global drivers of climate change. Article in Journal/Newspaper Antarc* Antarctic Arctic Climate change Ice Sheet North Atlantic Northeast Atlantic Ghent University Academic Bibliography Arctic Antarctic Rockall Plateau ENVELOPE(-18.833,-18.833,56.333,56.333) Paleoceanography and Paleoclimatology 36 7 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences middle Miocene sea surface temperature sea surface productivity North Atlantic dinoflagellate cysts ANTARCTIC ICE-SHEET SEA-SURFACE TEMPERATURE DINOFLAGELLATE CYST ASSEMBLAGES ATMOSPHERIC CARBON-DIOXIDE ISOTOPE STRATIGRAPHY CLIMATIC TRANSITION TETRAETHER LIPIDS ORGANIC-MATTER SOUTHERN CALIBRATION |
spellingShingle |
Earth and Environmental Sciences middle Miocene sea surface temperature sea surface productivity North Atlantic dinoflagellate cysts ANTARCTIC ICE-SHEET SEA-SURFACE TEMPERATURE DINOFLAGELLATE CYST ASSEMBLAGES ATMOSPHERIC CARBON-DIOXIDE ISOTOPE STRATIGRAPHY CLIMATIC TRANSITION TETRAETHER LIPIDS ORGANIC-MATTER SOUTHERN CALIBRATION Sangiorgi, Francesca Quaijtaal, Willemijn Donders, Timme H. Schouten, Stefan Louwye, Stephen Middle Miocene temperature and productivity evolution at a Northeast Atlantic shelf site (IODP U1318, Porcupine Basin) : global and regional changes |
topic_facet |
Earth and Environmental Sciences middle Miocene sea surface temperature sea surface productivity North Atlantic dinoflagellate cysts ANTARCTIC ICE-SHEET SEA-SURFACE TEMPERATURE DINOFLAGELLATE CYST ASSEMBLAGES ATMOSPHERIC CARBON-DIOXIDE ISOTOPE STRATIGRAPHY CLIMATIC TRANSITION TETRAETHER LIPIDS ORGANIC-MATTER SOUTHERN CALIBRATION |
description |
We present a high-resolution multiproxy middle Miocene sea surface temperature (SST) and productivity (SSP) reconstruction of Integrated Ocean Drilling Program Site U1318, from the upper slope edge (similar to 400 m water depth) of the Porcupine Basin continental margin, eastern North Atlantic Ocean. Biomarker and dinoflagellate cyst proxies reveal warm and mostly stratified waters during the Miocene Climatic Optimum (MCO) that cooled similar to 3 degrees C across the Miocene Climate Transition (MCT). The organic biomarker (TEX86 and UK ' 37) paleothermometers document a series of 11 transient cooling events (CEs), superimposed on the long-term climate evolution. These CEs are associated with increases in cold-water dinocysts and correlate to global benthic delta O-18 shifts, including the Mi-2, Mi-3, and Mi-4 events. Most CEs are also associated with increases in primary productivity. A prolonged interval of high SSP between similar to 13.8 and 13.6 Ma supports the idea that carbon production (and burial) in shallow areas represents a feedback mechanism contributing to long-term atmospheric CO2 decline and cooling during the MCT. SST comparison in three North Atlantic sites (Azores Site 608, Porcupine Basin Site U1318, and Rockall Plateau Site 982) reveals that MCO SSTs are much warmer at Site 608 than at the other two sites. The low-resolution SST record of Site 982 shows no decrease in temperature around the MCT. This may be linked to contemporaneous tectonic changes in the Tethys, Central American, and Arctic Seaways impacting local ocean circulation, superimposed on global drivers of climate change. |
format |
Article in Journal/Newspaper |
author |
Sangiorgi, Francesca Quaijtaal, Willemijn Donders, Timme H. Schouten, Stefan Louwye, Stephen |
author_facet |
Sangiorgi, Francesca Quaijtaal, Willemijn Donders, Timme H. Schouten, Stefan Louwye, Stephen |
author_sort |
Sangiorgi, Francesca |
title |
Middle Miocene temperature and productivity evolution at a Northeast Atlantic shelf site (IODP U1318, Porcupine Basin) : global and regional changes |
title_short |
Middle Miocene temperature and productivity evolution at a Northeast Atlantic shelf site (IODP U1318, Porcupine Basin) : global and regional changes |
title_full |
Middle Miocene temperature and productivity evolution at a Northeast Atlantic shelf site (IODP U1318, Porcupine Basin) : global and regional changes |
title_fullStr |
Middle Miocene temperature and productivity evolution at a Northeast Atlantic shelf site (IODP U1318, Porcupine Basin) : global and regional changes |
title_full_unstemmed |
Middle Miocene temperature and productivity evolution at a Northeast Atlantic shelf site (IODP U1318, Porcupine Basin) : global and regional changes |
title_sort |
middle miocene temperature and productivity evolution at a northeast atlantic shelf site (iodp u1318, porcupine basin) : global and regional changes |
publishDate |
2021 |
url |
https://biblio.ugent.be/publication/8732304 http://hdl.handle.net/1854/LU-8732304 https://doi.org/10.1029/2020PA004059 https://biblio.ugent.be/publication/8732304/file/8732305 |
long_lat |
ENVELOPE(-18.833,-18.833,56.333,56.333) |
geographic |
Arctic Antarctic Rockall Plateau |
geographic_facet |
Arctic Antarctic Rockall Plateau |
genre |
Antarc* Antarctic Arctic Climate change Ice Sheet North Atlantic Northeast Atlantic |
genre_facet |
Antarc* Antarctic Arctic Climate change Ice Sheet North Atlantic Northeast Atlantic |
op_source |
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY ISSN: 2572-4517 ISSN: 2572-4525 |
op_relation |
https://biblio.ugent.be/publication/8732304 http://hdl.handle.net/1854/LU-8732304 http://doi.org/10.1029/2020PA004059 https://biblio.ugent.be/publication/8732304/file/8732305 |
op_rights |
Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020PA004059 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
7 |
_version_ |
1786204035988062208 |