Preprints
https://doi.org/10.5194/cp-2021-24
https://doi.org/10.5194/cp-2021-24

  24 Mar 2021

24 Mar 2021

Review status: this preprint is currently under review for the journal CP.

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

Aleix Cortina-Guerra1, Juan José Gomez-Navarro2, Belen Martrat1, Juan Pedro Montávez2, Alessandro Incarbona3, Joan O. Grimalt1, Marie-Alexandrine Sicre4, and P. Graham Mortyn5,6 Aleix Cortina-Guerra et al.
  • 1Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA), Spanish Council for Scientific Research (CSIC), Barcelona, Spain
  • 2Department of Physics, University of Murcia, Murcia, Spain
  • 3Dipartimento di Scienze della Terra e del Mare, Università di Palermo, Palermo, Italy
  • 4Sorbonne Universités (UPMC, Université Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, Paris, France
  • 5Institute of Environmental Science and Technology (ICTA), Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
  • 6Department of Geography, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain

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 Lions was taken as a proxy of EMT-type events and correlated with winter mean geopotential height at 500 mb in the Northern Hemisphere (200 N-900 N and 1000 W-800 E). Correlations revealed a pattern similar to the Eastern Atlantic/Western Russian (EA/WR) mode as the main driver of EMT-type events, with the past 1000 yr 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.

Aleix Cortina-Guerra et al.

Status: open (until 25 May 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on cp-2021-24', Anonymous Referee #1, 21 Apr 2021 reply
  • RC2: 'Comment on cp-2021-24', Anonymous Referee #2, 11 May 2021 reply

Aleix Cortina-Guerra et al.

Aleix Cortina-Guerra et al.

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Short summary
During late XX century a singular Mediterranean circulation episode called the Eastern Mediterranean transient (EMT) event occurred. It involved changes on the seawater physical and biogeochemical properties, that can impact broadly areas. Here, using paleosimulations for the last 1000 years we found that the Eastern Atlantic/Western Russian atmospheric mode was the main driver of the EMT-type events in the past, and that enhancement of this mode was coetaneous with low solar insolation.