Atlantic Multidecadal Variability (AMV) is known for being able to influence the mid-latitude climate variability, especially over the European region. In this work we assess the impact of the wintertime AMV in a group of 200-year atmospheric-only simulation performed with EC-Earth 3.1. We force the atmosphere with positive and negative AMV-like SSTs and Sea Ice Concentrations patterns: firstly we apply the AMV anomalies to the whole North Atlantic ocean, hence only to the extratropics (north of 30oN) and finally only to the tropics (between 0o and 30oN), for a total of 6 experiments. Preliminary results show a wintertime NAO-like signal associated with a shift of the jet stream and changes in the blocking frequencies, leading to a negative NAO during positive AMV and viceversa. Surprisingly, the bulk of the signal is caused by the tropical anomalies, and it is associated with the changes in tropical precipitation along the Equator. Indeed, the NAO-like response is almost negligible when the AMV anomalies are applied only to the extratropics.

Influence of the Atlantic Multidecadal Variability on the Winter European Climate in EC-Earth 3.1

Paolo Davini;Susanna Corti
2015

Abstract

Atlantic Multidecadal Variability (AMV) is known for being able to influence the mid-latitude climate variability, especially over the European region. In this work we assess the impact of the wintertime AMV in a group of 200-year atmospheric-only simulation performed with EC-Earth 3.1. We force the atmosphere with positive and negative AMV-like SSTs and Sea Ice Concentrations patterns: firstly we apply the AMV anomalies to the whole North Atlantic ocean, hence only to the extratropics (north of 30oN) and finally only to the tropics (between 0o and 30oN), for a total of 6 experiments. Preliminary results show a wintertime NAO-like signal associated with a shift of the jet stream and changes in the blocking frequencies, leading to a negative NAO during positive AMV and viceversa. Surprisingly, the bulk of the signal is caused by the tropical anomalies, and it is associated with the changes in tropical precipitation along the Equator. Indeed, the NAO-like response is almost negligible when the AMV anomalies are applied only to the extratropics.
2015
Istituto di Scienze dell'Atmosfera e del Clima - ISAC
amv
Atlantic Multidecadal Variability
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/333279
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact