Northern Hemisphere atmospheric pattern enhancing Eastern Mediterranean Transient-type events during the past 1000 years

Aleix Cortina-Guerra*, Juan José Gomez-Navarro, Belen Martrat, Juan Pedro Montávez, Alessandro Incarbona, Joan O. Grimalt, Marie Alexandrine Sicre, P. Graham Mortyn

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

Abstract

High-resolution climate model simulations for the last millennium were used to elucidate the main winter Northern Hemisphere atmospheric pattern during enhanced Eastern Mediterranean Transient (EMT-type) events, a situation in which an additional overturning cell is detected in the Mediterranean at the Aegean Sea. The differential upward heat flux between the Aegean Basin and the Gulf of Lion was taken as a proxy of EMT-type events and correlated with winter mean geopotential height at 500gmbar in the Northern Hemisphere (20-90g gN and 100g gW-80g gE). Correlations revealed a pattern similar to the East Atlantic/Western Russian (EA/WR) mode as the main driver of EMT-type events, with the past 1000 years of EA/WR-like mode simulations being enhanced during insolation minima. Our model results are consistent with alkenone sea surface temperature (SST) reconstructions that documented an increase in the west-east basin gradients during EMT-type events.

Original languageEnglish
Pages (from-to)1523-1532
Number of pages10
JournalClimate of the Past
Volume17
Issue number4
DOIs
Publication statusPublished - 20 Jul 2021

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