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Pàgina inicial > Articles > Articles publicats > Mediterranean circulation perturbations over the last five centuries : |
Data: | 2016 |
Resum: | 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. |
Ajuts: | European Commission 265103 European Commission 243908 Ministerio de Economía y Competitividad CTM 2014-59111 Ministerio de Economía y Competitividad RYC-2013-14073 Ministerio de Economía y Competitividad RYC-2013-14714 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1356 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1090 |
Nota: | Unidad de excelencia María de Maeztu MdM-2015-0552 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Publicat a: | Scientific reports, Vol. 6 (Jan. 2016) , p. 29623, ISSN 2045-2322 |
10 p, 1.4 MB |