Abstract
The parasol effect of volcanic dust and aerosol caused by volcanic eruption results in the deepening and strengthening of the Arctic vortex system, thus stimulating or strengthening the Arctic Oscillation (AO). Three of the strongest AOs in more than a century have been linked to volcanic eruptions. Every significant fluctuation of the AO index (AOI = ΔH_middle latitudes − ΔH_Arctic) for many years has been associated with a volcanic eruption. Volcanic activity occurring at different locations in the Arctic vortex circulation will exert different effects on the polar vortex.
Highlights
The parasol effect of volcanic aerosol layer and volcanic dust curtain caused by volcanic eruption, so that the troposphere low temperature drops, isobaric surface drops, the Arctic vortex system deepens, To stimulate or strengthen the Arctic oscillation
The third-strongest AO occurred in March 1990, was triggered by successive eruptions of the Alaskan Level-3 Redoubt Volcano on December 7, 1989 and January 2, 1990, and the Kamchatka Kliuchevskol Volcano Level-3 eruption on February 1, 1990. These eruptions occurred in convergent updrafts ahead of the trough and behind the ridge of high pressure in the polar vortex circulation
The sun umbrella effect of these materials caused the Arctic vortex system to deepen and strengthen, stimulating or reinforcing the AO
Summary
The parasol effect of volcanic aerosol layer and volcanic dust curtain caused by volcanic eruption, so that the troposphere low temperature drops, isobaric surface drops, the Arctic vortex system deepens, To stimulate or strengthen the Arctic oscillation.
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