Abstract:

The temporary enhancement of the stratospheric aerosol layer after major explosive volcanic eruptions can trigger climate anomalies beyond the duration of the radiative forcing. Whereas the mechanisms responsible for long-lasting response to volcanic forcing have been extensively investigated for tropical eruptions, less is known about dynamical responses to high-latitude eruptions. Here I will discuss results from climate simulation ensembles of an idealized long-lasting (6 months) northern hemisphere high-latitude eruption where the northern hemisphere response is investigated during the first three post-eruption boreal winters, focusing on dynamics governing the stratospheric polar vortex as well as stratosphere-troposphere coupling.

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