Enhanced western mediterranean rainfall during past interglacials driven by North Atlantic pressure changes
There is increasing concern with anthropogenic greenhouse gas emissions that ocean warming, in concert with summer and winter precipitation changes, will induce anoxia in multiple ocean basins, such as in the Mediterranean Sea. Although the hydrological changes in the eastern Mediterranean are quite...
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ftarchimer:oai:archimer.ifremer.fr:75519 2023-05-15T17:30:42+02:00 Enhanced western mediterranean rainfall during past interglacials driven by North Atlantic pressure changes Dixit, Yama Toucanne, Samuel Fontanier, Christophe Pasquier, Virgil Lora, Juan M. Jouet, Gwenael Tripati, Aradhna 2020-07 application/pdf https://archimer.ifremer.fr/doc/00643/75519/76396.pdf https://doi.org/10.1016/j.quaint.2020.08.017 https://archimer.ifremer.fr/doc/00643/75519/ eng eng Elsevier BV info:eu-repo/grantAgreement/EC/FP7/609102/EU//PRESTIGE https://archimer.ifremer.fr/doc/00643/75519/76396.pdf doi:10.1016/j.quaint.2020.08.017 https://archimer.ifremer.fr/doc/00643/75519/ info:eu-repo/semantics/openAccess restricted use Quaternary International (1040-6182) (Elsevier BV), 2020-07 , Vol. 553 , P. 1-13 Western mediterranean Interglacials Mg/ca-SST Ba/Ca-salinity Sapropel Foraminifera text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1016/j.quaint.2020.08.017 2021-10-26T22:57:37Z There is increasing concern with anthropogenic greenhouse gas emissions that ocean warming, in concert with summer and winter precipitation changes, will induce anoxia in multiple ocean basins, such as in the Mediterranean Sea. Although the hydrological changes in the eastern Mediterranean are quite well constrained, quantitative evidence of changes in sea surface temperature (SST) and winter rainfall in the western Mediterranean across the past interglacials is relatively scarce. In this study, we use a combination of trace element (Ba/Ca and Mg/Ca) and stable oxygen isotope composition of planktonic foraminifera from a sediment core located off the Golo River, Corsica (northern Tyrrhenian Sea) to reconstruct variations in SSTs and sea surface salinities (SSS) during the Holocene (MIS 1) and warm periods of the past two interglacials (MIS 5, 7). We also analyse PMIP3 model simulations for the mid-Holocene to investigate the mechanism for moisture transport in the western Mediterranean. Our Mg/Ca-SSTs, Ba/Ca-salinity and derived δ18O-seawater records suggest that the warm periods of the Last interglacials were characterized by high river discharge and lower SSS in the northern Tyrrhenian Sea. Since this region is ideally located on the trajectory of wintertime storm tracks across the North Atlantic into the Mediterranean Sea and is also outside the influence of the ITCZ-controlled summer monsoon rains, we suggest enhanced winter rainfall during the past interglacials. Our analysis of PMIP3 model simulations for mid-Holocene also support increased south-westerly moisture transport into the western Mediterranean originating from the North Atlantic. We also find evidence that long-term amplitude of the salinity decrease tightly follows eccentricity. We suggest that these hydrologic changes in the western Mediterranean, and the northern Mediterranean borderlands as a whole, were a contributing factor, together with local cyclogenesis and African summer monsoon rainfall, to basin-wide anoxia in the past. Our findings offer new constraints to the amplitude and cause of winter rainfall changes in the Mediterranean during past warm periods. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Quaternary International 553 1 13 |
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 |
Western mediterranean Interglacials Mg/ca-SST Ba/Ca-salinity Sapropel Foraminifera |
spellingShingle |
Western mediterranean Interglacials Mg/ca-SST Ba/Ca-salinity Sapropel Foraminifera Dixit, Yama Toucanne, Samuel Fontanier, Christophe Pasquier, Virgil Lora, Juan M. Jouet, Gwenael Tripati, Aradhna Enhanced western mediterranean rainfall during past interglacials driven by North Atlantic pressure changes |
topic_facet |
Western mediterranean Interglacials Mg/ca-SST Ba/Ca-salinity Sapropel Foraminifera |
description |
There is increasing concern with anthropogenic greenhouse gas emissions that ocean warming, in concert with summer and winter precipitation changes, will induce anoxia in multiple ocean basins, such as in the Mediterranean Sea. Although the hydrological changes in the eastern Mediterranean are quite well constrained, quantitative evidence of changes in sea surface temperature (SST) and winter rainfall in the western Mediterranean across the past interglacials is relatively scarce. In this study, we use a combination of trace element (Ba/Ca and Mg/Ca) and stable oxygen isotope composition of planktonic foraminifera from a sediment core located off the Golo River, Corsica (northern Tyrrhenian Sea) to reconstruct variations in SSTs and sea surface salinities (SSS) during the Holocene (MIS 1) and warm periods of the past two interglacials (MIS 5, 7). We also analyse PMIP3 model simulations for the mid-Holocene to investigate the mechanism for moisture transport in the western Mediterranean. Our Mg/Ca-SSTs, Ba/Ca-salinity and derived δ18O-seawater records suggest that the warm periods of the Last interglacials were characterized by high river discharge and lower SSS in the northern Tyrrhenian Sea. Since this region is ideally located on the trajectory of wintertime storm tracks across the North Atlantic into the Mediterranean Sea and is also outside the influence of the ITCZ-controlled summer monsoon rains, we suggest enhanced winter rainfall during the past interglacials. Our analysis of PMIP3 model simulations for mid-Holocene also support increased south-westerly moisture transport into the western Mediterranean originating from the North Atlantic. We also find evidence that long-term amplitude of the salinity decrease tightly follows eccentricity. We suggest that these hydrologic changes in the western Mediterranean, and the northern Mediterranean borderlands as a whole, were a contributing factor, together with local cyclogenesis and African summer monsoon rainfall, to basin-wide anoxia in the past. Our findings offer new constraints to the amplitude and cause of winter rainfall changes in the Mediterranean during past warm periods. |
format |
Article in Journal/Newspaper |
author |
Dixit, Yama Toucanne, Samuel Fontanier, Christophe Pasquier, Virgil Lora, Juan M. Jouet, Gwenael Tripati, Aradhna |
author_facet |
Dixit, Yama Toucanne, Samuel Fontanier, Christophe Pasquier, Virgil Lora, Juan M. Jouet, Gwenael Tripati, Aradhna |
author_sort |
Dixit, Yama |
title |
Enhanced western mediterranean rainfall during past interglacials driven by North Atlantic pressure changes |
title_short |
Enhanced western mediterranean rainfall during past interglacials driven by North Atlantic pressure changes |
title_full |
Enhanced western mediterranean rainfall during past interglacials driven by North Atlantic pressure changes |
title_fullStr |
Enhanced western mediterranean rainfall during past interglacials driven by North Atlantic pressure changes |
title_full_unstemmed |
Enhanced western mediterranean rainfall during past interglacials driven by North Atlantic pressure changes |
title_sort |
enhanced western mediterranean rainfall during past interglacials driven by north atlantic pressure changes |
publisher |
Elsevier BV |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00643/75519/76396.pdf https://doi.org/10.1016/j.quaint.2020.08.017 https://archimer.ifremer.fr/doc/00643/75519/ |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Quaternary International (1040-6182) (Elsevier BV), 2020-07 , Vol. 553 , P. 1-13 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/609102/EU//PRESTIGE https://archimer.ifremer.fr/doc/00643/75519/76396.pdf doi:10.1016/j.quaint.2020.08.017 https://archimer.ifremer.fr/doc/00643/75519/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.quaint.2020.08.017 |
container_title |
Quaternary International |
container_volume |
553 |
container_start_page |
1 |
op_container_end_page |
13 |
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1766127582278844416 |