Alessia Dellea
Response of ENSO variability to reduced AMOC strength.
Rel. Jost-Diedrich Graf Von Hardenberg, Katinka Bellomo Repetto. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Per L'Ambiente E Il Territorio, 2025
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Abstract
The El Niño-Southern Oscillation (ENSO) and the Atlantic Meridional Overturning Circulation (AMOC) are critical components of the global climate system. Their potential interaction through teleconnections is a subject of major scientific importance, yet existing literature lacks consensus on the nature of this link, especially under future warming scenarios. This thesis investigates the state dependence of the AMOC-ENSO teleconnection, examining how their interaction changes based on the background climate state. Using the EC-Earth3 climate model, four targeted simulations are analyzed: a strong and weak AMOC state under both preindustrial and high-emission 4xCO2 conditions. Under preindustrial conditions, a weakened AMOC induces a weak and asymmetric response.
The net effect on ENSO variability is minimal, with a modest amplification of El Niño events in the eastern Pacific, while La Niña events remain largely unchanged
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