Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach
High-resolution paleoproductivity variations have been reconstructed in a productive cell in the Alboran Sea for the Holocene. Fossil coccolithophore assemblages have been studied along with the U37 k' -estimated sea-surface temperature ( SST) and other paleoenvironmental proxies. The appearanc...
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Sage Publications Ltd
2015
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ftarchimer:oai:archimer.ifremer.fr:46265 2023-05-15T17:31:36+02:00 Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach Ausin, Blanca Flores, Jose A. Sierro, Francisco J. Cacho, Isabel Hernandez-almeida, Ivan Martrat, Belen Grimalt, Joan O. 2015-04 application/pdf https://archimer.ifremer.fr/doc/00351/46265/46054.pdf https://archimer.ifremer.fr/doc/00351/46265/46055.tif https://doi.org/10.1177/0959683614565952 https://archimer.ifremer.fr/doc/00351/46265/ eng eng Sage Publications Ltd https://archimer.ifremer.fr/doc/00351/46265/46054.pdf https://archimer.ifremer.fr/doc/00351/46265/46055.tif doi:10.1177/0959683614565952 https://archimer.ifremer.fr/doc/00351/46265/ The Author(s) 2015 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav info:eu-repo/semantics/openAccess restricted use Holocene (0959-6836) (Sage Publications Ltd), 2015-04 , Vol. 25 , N. 4 , P. 583-595 Alboran Sea coccolithophore productivity Holocene North Atlantic Oscillation Western Mediterranean Deep Water text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.1177/0959683614565952 2021-09-23T20:28:47Z High-resolution paleoproductivity variations have been reconstructed in a productive cell in the Alboran Sea for the Holocene. Fossil coccolithophore assemblages have been studied along with the U37 k' -estimated sea-surface temperature ( SST) and other paleoenvironmental proxies. The appearance of this cell is suggested at 7.7 ka cal. BP and was linked to the establishment of the western anti-cyclonic gyre. From that time until the present, the nannofossil accumulation rate of Florisphaera profunda has revealed successive episodes of weakening and strengthening of upwelling conditions in the Alboran Sea that have been simultaneous to changes in Western Mediterranean Deep Water ( WMDW) formation in the Gulf of Lions. A two-phase scenario operating at millennial-centennial time scale is proposed to explain this climatic and oceanographic variability: ( 1) coeval with more arid climate conditions, weaker northerlies or north-westerlies blowing over the Gulf of Lions would have triggered a slackening of WMDW formation. This together with a minor Atlantic Jet ( AJ) inflowing into the Alboran Sea would have led to less vertical mixing and, hence, a more stable water column in the study area; ( 2) wetter climate conditions would have prevailed in the region, while stronger northerlies or north-westerlies would have enabled WMDW reinforcement in the Gulf of Lions simultaneous to an intensification of the AJ that migrated southward. This would have increased vertical mixing, intensifying upwelling conditions in the study area. Here, the winter North Atlantic Oscillation ( NAO) is considered to be an important forcing mechanism for this variability, influencing WMDW formation, which in turn has been linked to short-term productivity variations during the last 7.7 ka in the Alboran Sea. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) The Holocene 25 4 583 595 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Alboran Sea coccolithophore productivity Holocene North Atlantic Oscillation Western Mediterranean Deep Water |
spellingShingle |
Alboran Sea coccolithophore productivity Holocene North Atlantic Oscillation Western Mediterranean Deep Water Ausin, Blanca Flores, Jose A. Sierro, Francisco J. Cacho, Isabel Hernandez-almeida, Ivan Martrat, Belen Grimalt, Joan O. Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach |
topic_facet |
Alboran Sea coccolithophore productivity Holocene North Atlantic Oscillation Western Mediterranean Deep Water |
description |
High-resolution paleoproductivity variations have been reconstructed in a productive cell in the Alboran Sea for the Holocene. Fossil coccolithophore assemblages have been studied along with the U37 k' -estimated sea-surface temperature ( SST) and other paleoenvironmental proxies. The appearance of this cell is suggested at 7.7 ka cal. BP and was linked to the establishment of the western anti-cyclonic gyre. From that time until the present, the nannofossil accumulation rate of Florisphaera profunda has revealed successive episodes of weakening and strengthening of upwelling conditions in the Alboran Sea that have been simultaneous to changes in Western Mediterranean Deep Water ( WMDW) formation in the Gulf of Lions. A two-phase scenario operating at millennial-centennial time scale is proposed to explain this climatic and oceanographic variability: ( 1) coeval with more arid climate conditions, weaker northerlies or north-westerlies blowing over the Gulf of Lions would have triggered a slackening of WMDW formation. This together with a minor Atlantic Jet ( AJ) inflowing into the Alboran Sea would have led to less vertical mixing and, hence, a more stable water column in the study area; ( 2) wetter climate conditions would have prevailed in the region, while stronger northerlies or north-westerlies would have enabled WMDW reinforcement in the Gulf of Lions simultaneous to an intensification of the AJ that migrated southward. This would have increased vertical mixing, intensifying upwelling conditions in the study area. Here, the winter North Atlantic Oscillation ( NAO) is considered to be an important forcing mechanism for this variability, influencing WMDW formation, which in turn has been linked to short-term productivity variations during the last 7.7 ka in the Alboran Sea. |
format |
Article in Journal/Newspaper |
author |
Ausin, Blanca Flores, Jose A. Sierro, Francisco J. Cacho, Isabel Hernandez-almeida, Ivan Martrat, Belen Grimalt, Joan O. |
author_facet |
Ausin, Blanca Flores, Jose A. Sierro, Francisco J. Cacho, Isabel Hernandez-almeida, Ivan Martrat, Belen Grimalt, Joan O. |
author_sort |
Ausin, Blanca |
title |
Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach |
title_short |
Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach |
title_full |
Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach |
title_fullStr |
Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach |
title_full_unstemmed |
Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach |
title_sort |
atmospheric patterns driving holocene productivity in the alboran sea (western mediterranean): a multiproxy approach |
publisher |
Sage Publications Ltd |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00351/46265/46054.pdf https://archimer.ifremer.fr/doc/00351/46265/46055.tif https://doi.org/10.1177/0959683614565952 https://archimer.ifremer.fr/doc/00351/46265/ |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Holocene (0959-6836) (Sage Publications Ltd), 2015-04 , Vol. 25 , N. 4 , P. 583-595 |
op_relation |
https://archimer.ifremer.fr/doc/00351/46265/46054.pdf https://archimer.ifremer.fr/doc/00351/46265/46055.tif doi:10.1177/0959683614565952 https://archimer.ifremer.fr/doc/00351/46265/ |
op_rights |
The Author(s) 2015 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1177/0959683614565952 |
container_title |
The Holocene |
container_volume |
25 |
container_issue |
4 |
container_start_page |
583 |
op_container_end_page |
595 |
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1766129273193627648 |