English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Observations and simple theoretical arguments suggest that the NorthernHemisphere (NH) stratospheric polar vortex is stronger in winters followingmajor volcanic eruptions. However, recent studies show that climate modelsforced by prescribed volcanic aerosol fields fail to reproduce this effect.We investigate the impact of volcanic aerosol forcing on stratosphericdynamics, including the strength of the NH polar vortex, in ensemblesimulations with the Max Planck Institute Earth System Model. The model isforced by four different prescribed forcing sets representing the radiativeproperties of stratospheric aerosol following the 1991 eruption of Mt. Pinatubo: two forcing sets are based on observations, and are commonly usedin climate model simulations, and two forcing sets are constructed based oncoupled aerosol–climate model simulations. For all forcings, we find that simulatedtemperature and zonal wind anomalies in the NH high latitudes are notdirectly impacted by anomalous volcanic aerosol heating. Instead, high-latitude effects result from enhancements in stratospheric residualcirculation, which in turn result, at least in part, from enhancedstratospheric wave activity. High-latitude effects are therefore much lessrobust than would be expected if they were the direct result of aerosolheating. Both observation-based forcing sets result in insignificant changesin vortex strength. For the model-based forcing sets, the vortex response isfound to be sensitive to the structure of the forcing, with one forcing setleading to significant strengthening of the polar vortex in rough agreementwith observation-based expectations. Differences in the dynamical responseto the forcing sets imply that reproducing the polar vortex responses topast eruptions, or predicting the response to future eruptions, depends onaccurate representation of the space–time structure of the volcanic aerosolforcing

The impact of volcanic aerosol on the Northern Hemisphere stratospheric polar vortex: mechanisms and sensitivity to forcing structure