Mediterranean circulation perturbations over the last five centuries: Relevance to past Eastern Mediterranean Transient-type events

Rodolfo Sprovieri, Enrico Di Stefano, Alessandro Incarbona, Belen Martrat, Alexandra Gogou, Maria Triantaphyllou, P. Graham Mortyn, Leonardo Langone, Mario Sprovieri, Patrizia Ziveri, Juerg Luterbacher, Salvatore Mazzola, Elena Xoplaki, Joan O. Grimalt, Gianluca Marino, Gabriel Jordà, Giorgio Tranchida, Laura Rodríguez-Sanz

Risultato della ricerca: Article

12 Citazioni (Scopus)

Abstract

The Eastern Mediterranean Transient (EMT) occurred in the Aegean Sea from 1988 to 1995 and is the most significant intermediate-to-deep Mediterranean overturning perturbation reported by instrumental records. The EMT was likely caused by accumulation of high salinity waters in the Levantine and enhanced heat loss in the Aegean Sea, coupled with surface water freshening in the Sicily Channel. It is still unknown whether similar transients occurred in the past and, if so, what their forcing processes were. In this study, sediments from the Sicily Channel document surface water freshening (SCFR) at 1910 ± 12, 1812 ± 18, 1725 ± 25 and 1580 ± 30 CE. A regional ocean hindcast links SCFR to enhanced deep-water production and in turn to strengthened Mediterranean thermohaline circulation. Independent evidence collected in the Aegean Sea supports this reconstruction, showing that enhanced bottom water ventilation in the Eastern Mediterranean was associated with each SCFR event. Comparison between the records and multi-decadal atmospheric circulation patterns and climatic external forcings indicates that Mediterranean circulation destabilisation occurs during positive North Atlantic Oscillation (NAO) and negative Atlantic Multidecadal Oscillation (AMO) phases, reduced solar activity and strong tropical volcanic eruptions. They may have recurrently produced favourable deep-water formation conditions, both increasing salinity and reducing temperature on multi-decadal time scales.
Lingua originaleEnglish
pagine (da-a)-
Numero di pagine10
RivistaScientific Reports
Volume6
Stato di pubblicazionePublished - 2016

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perturbation
surface water
Atlantic Multidecadal Oscillation
deep water formation
thermohaline circulation
North Atlantic Oscillation
atmospheric circulation
solar activity
bottom water
ventilation
volcanic eruption
deep water
timescale
salinity
ocean
sediment
sea
temperature

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Mediterranean circulation perturbations over the last five centuries: Relevance to past Eastern Mediterranean Transient-type events. / Sprovieri, Rodolfo; Di Stefano, Enrico; Incarbona, Alessandro; Martrat, Belen; Gogou, Alexandra; Triantaphyllou, Maria; Mortyn, P. Graham; Langone, Leonardo; Sprovieri, Mario; Ziveri, Patrizia; Luterbacher, Juerg; Mazzola, Salvatore; Xoplaki, Elena; Grimalt, Joan O.; Marino, Gianluca; Jordà, Gabriel; Tranchida, Giorgio; Rodríguez-Sanz, Laura.

In: Scientific Reports, Vol. 6, 2016, pag. -.

Risultato della ricerca: Article

Sprovieri, R, Di Stefano, E, Incarbona, A, Martrat, B, Gogou, A, Triantaphyllou, M, Mortyn, PG, Langone, L, Sprovieri, M, Ziveri, P, Luterbacher, J, Mazzola, S, Xoplaki, E, Grimalt, JO, Marino, G, Jordà, G, Tranchida, G & Rodríguez-Sanz, L 2016, 'Mediterranean circulation perturbations over the last five centuries: Relevance to past Eastern Mediterranean Transient-type events', Scientific Reports, vol. 6, pagg. -.
Sprovieri, Rodolfo ; Di Stefano, Enrico ; Incarbona, Alessandro ; Martrat, Belen ; Gogou, Alexandra ; Triantaphyllou, Maria ; Mortyn, P. Graham ; Langone, Leonardo ; Sprovieri, Mario ; Ziveri, Patrizia ; Luterbacher, Juerg ; Mazzola, Salvatore ; Xoplaki, Elena ; Grimalt, Joan O. ; Marino, Gianluca ; Jordà, Gabriel ; Tranchida, Giorgio ; Rodríguez-Sanz, Laura. / Mediterranean circulation perturbations over the last five centuries: Relevance to past Eastern Mediterranean Transient-type events. In: Scientific Reports. 2016 ; Vol. 6. pagg. -.
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title = "Mediterranean circulation perturbations over the last five centuries: Relevance to past Eastern Mediterranean Transient-type events",
abstract = "The Eastern Mediterranean Transient (EMT) occurred in the Aegean Sea from 1988 to 1995 and is the most significant intermediate-to-deep Mediterranean overturning perturbation reported by instrumental records. The EMT was likely caused by accumulation of high salinity waters in the Levantine and enhanced heat loss in the Aegean Sea, coupled with surface water freshening in the Sicily Channel. It is still unknown whether similar transients occurred in the past and, if so, what their forcing processes were. In this study, sediments from the Sicily Channel document surface water freshening (SCFR) at 1910 ± 12, 1812 ± 18, 1725 ± 25 and 1580 ± 30 CE. A regional ocean hindcast links SCFR to enhanced deep-water production and in turn to strengthened Mediterranean thermohaline circulation. Independent evidence collected in the Aegean Sea supports this reconstruction, showing that enhanced bottom water ventilation in the Eastern Mediterranean was associated with each SCFR event. Comparison between the records and multi-decadal atmospheric circulation patterns and climatic external forcings indicates that Mediterranean circulation destabilisation occurs during positive North Atlantic Oscillation (NAO) and negative Atlantic Multidecadal Oscillation (AMO) phases, reduced solar activity and strong tropical volcanic eruptions. They may have recurrently produced favourable deep-water formation conditions, both increasing salinity and reducing temperature on multi-decadal time scales.",
keywords = "Paleoceanography; Mediterranean Sea; Eastern Mediterranean transient",
author = "Rodolfo Sprovieri and {Di Stefano}, Enrico and Alessandro Incarbona and Belen Martrat and Alexandra Gogou and Maria Triantaphyllou and Mortyn, {P. Graham} and Leonardo Langone and Mario Sprovieri and Patrizia Ziveri and Juerg Luterbacher and Salvatore Mazzola and Elena Xoplaki and Grimalt, {Joan O.} and Gianluca Marino and Gabriel Jord{\`a} and Giorgio Tranchida and Laura Rodr{\'i}guez-Sanz",
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TY - JOUR

T1 - Mediterranean circulation perturbations over the last five centuries: Relevance to past Eastern Mediterranean Transient-type events

AU - Sprovieri, Rodolfo

AU - Di Stefano, Enrico

AU - Incarbona, Alessandro

AU - Martrat, Belen

AU - Gogou, Alexandra

AU - Triantaphyllou, Maria

AU - Mortyn, P. Graham

AU - Langone, Leonardo

AU - Sprovieri, Mario

AU - Ziveri, Patrizia

AU - Luterbacher, Juerg

AU - Mazzola, Salvatore

AU - Xoplaki, Elena

AU - Grimalt, Joan O.

AU - Marino, Gianluca

AU - Jordà, Gabriel

AU - Tranchida, Giorgio

AU - Rodríguez-Sanz, Laura

PY - 2016

Y1 - 2016

N2 - The Eastern Mediterranean Transient (EMT) occurred in the Aegean Sea from 1988 to 1995 and is the most significant intermediate-to-deep Mediterranean overturning perturbation reported by instrumental records. The EMT was likely caused by accumulation of high salinity waters in the Levantine and enhanced heat loss in the Aegean Sea, coupled with surface water freshening in the Sicily Channel. It is still unknown whether similar transients occurred in the past and, if so, what their forcing processes were. In this study, sediments from the Sicily Channel document surface water freshening (SCFR) at 1910 ± 12, 1812 ± 18, 1725 ± 25 and 1580 ± 30 CE. A regional ocean hindcast links SCFR to enhanced deep-water production and in turn to strengthened Mediterranean thermohaline circulation. Independent evidence collected in the Aegean Sea supports this reconstruction, showing that enhanced bottom water ventilation in the Eastern Mediterranean was associated with each SCFR event. Comparison between the records and multi-decadal atmospheric circulation patterns and climatic external forcings indicates that Mediterranean circulation destabilisation occurs during positive North Atlantic Oscillation (NAO) and negative Atlantic Multidecadal Oscillation (AMO) phases, reduced solar activity and strong tropical volcanic eruptions. They may have recurrently produced favourable deep-water formation conditions, both increasing salinity and reducing temperature on multi-decadal time scales.

AB - The Eastern Mediterranean Transient (EMT) occurred in the Aegean Sea from 1988 to 1995 and is the most significant intermediate-to-deep Mediterranean overturning perturbation reported by instrumental records. The EMT was likely caused by accumulation of high salinity waters in the Levantine and enhanced heat loss in the Aegean Sea, coupled with surface water freshening in the Sicily Channel. It is still unknown whether similar transients occurred in the past and, if so, what their forcing processes were. In this study, sediments from the Sicily Channel document surface water freshening (SCFR) at 1910 ± 12, 1812 ± 18, 1725 ± 25 and 1580 ± 30 CE. A regional ocean hindcast links SCFR to enhanced deep-water production and in turn to strengthened Mediterranean thermohaline circulation. Independent evidence collected in the Aegean Sea supports this reconstruction, showing that enhanced bottom water ventilation in the Eastern Mediterranean was associated with each SCFR event. Comparison between the records and multi-decadal atmospheric circulation patterns and climatic external forcings indicates that Mediterranean circulation destabilisation occurs during positive North Atlantic Oscillation (NAO) and negative Atlantic Multidecadal Oscillation (AMO) phases, reduced solar activity and strong tropical volcanic eruptions. They may have recurrently produced favourable deep-water formation conditions, both increasing salinity and reducing temperature on multi-decadal time scales.

KW - Paleoceanography; Mediterranean Sea; Eastern Mediterranean transient

UR - http://hdl.handle.net/10447/222962

M3 - Article

VL - 6

SP - -

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

ER -