The influence of volcanic eruptions on circulation regimes over the North Atlantic and their impact on European climate

Yang Feng (1) , Myriam Khodri (1) , Laurent Li (2) , Marie-Alexandrine Sicre (3) , Nicolas Lebas (1)

1 VARCLIM - Océan et variabilité du climat
2 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
3 VOG - Variabilité de l'Océan et de la Glace de mer

Large volcanic eruptions influence climate on both annual and decadal time scales due todynamical interactions of different climate components in the Earth's system. It is well established that the North Atlantic Oscillation (NAO) tends to shift towards its positive phase during the winter season in the first 1–2 years after large tropical volcanic eruptions, causing warming over Europe. However, other North Atlantic circulation regimes such as Atlantic Ridge or zonal regime have received less attention. This study explores the volcanic fingerprint in terms of patterns and mechanisms on the North Atlantic atmospheric circulation in IPSL-CM6A-LR model simulations for tropical eruptions of the last millennium using dedicated sensitivity experiments and observation

Domaines: Planète et Univers [physics]; Sciences de la Terre; Climatologie

Yang Feng, Myriam Khodri, Laurent Li, Marie-Alexandrine Sicre, Nicolas Lebas. The influence of volcanic eruptions on circulation regimes over the North Atlantic and their impact on European climate. EGU 2020, May 2020, Vienne, Austria. ⟨10.5194/egusphere-egu2020-17415⟩. ⟨hal-03503469⟩