Atlantic Multidecadal Variability and North Atlantic Jet: a multi-model view from the Decadal Climate Prediction Project

The influence of the Atlantic multidecadal variability (AMV) on the North Atlantic storm track and eddy-driven jet in the winter season is assessed via a coordinated analysis of idealized simulations with state-of-the-art coupled models. Data used are obtained from a multimodel ensemble of AMV± experiments conducted in the framework of the Decadal Climate Prediction Project component C. These experiments are performed by nudging the surface of the Atlantic Ocean to states defined by the superimposition of observed AMV± anomalies onto the model climatology. A robust extratropical response is found in the form of a wave train extending from the Pacific to the Nordic seas. In the warm phase of the AMV compared to the cold phase, the Atlantic storm track is typically contracted and less extended poleward and the low-level jet is shifted toward the equator in the eastern Atlantic. Despite some robust features, the picture of an uncertain and model-dependent response of the Atlantic jet emerges and we demonstrate a link between model bias and the character of the jet response.

RUGGERI Paolo;  BELLUCCI Alessio;  NICOLI Dario;  ATHANASIADIS Panos;  GUALDI Silvio;  CASSOU Christophe;  CASTRUCCIO Frederic;  DANABASOGLU Gokhan;  DAVINI Paolo;  DUNSTONE Nick;  EADE Rosemary;  GASTINEAU Guillaume;  HARVEY Ben;  HERMANSON Leon;  QASMI Said;  RUPRICH-ROBERT Yohan;  SANCHEZ-GOMEZ Emilia;  SMITH Doug;  WILD Simon;  ZAMPIERI Matteo; 

2021-12-07

AMER METEOROLOGICAL SOC

JRC120632

0894-8755 (online),   

https://journals.ametsoc.org/configurable/content/journals$002fclim$002f34$002f1$002fJCLI-D-19-0981.1.xml?t:ac=journals%24002fclim%24002f34%24002f1%24002fJCLI-D-19-0981.1.xml,    https://publications.jrc.ec.europa.eu/repository/handle/JRC120632,   

10.1175/JCLI-D-19-0981.1 (online),