EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model comparison of volcanic aerosol forcing and climate impact of tropical and extratropical eruptions

Zhihong Zhuo1, Herman Fuglestvedt1, Matthew Toohey2, Michael J. Mills3, and Kirstin Krüger1
Zhihong Zhuo et al.
  • 1Section for Meteorology and Oceanography, Department of Geosciences, University of Oslo, Oslo, Norway
  • 2Institute for Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 3Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, USA

Major volcanic eruptions increase sulfate aerosols in the stratosphere. This causes a large-scale dimming effect with significant surface cooling and stratosphere warming. However, the climate impact differs for tropical and extratropical eruptions, and depends on the eruption season and height, and volcanic volatiles injections. In order to study different volcanic aerosol forcing and their climate impact, we perform simulations based on the fully coupled Community Earth System Model version 2 (CESM2) with the version 6 of the Whole Atmosphere Community Climate Model (WACCM6) with prognostic stratospheric aerosol and chemistry. In this study, explosive eruptions at 14.6 N and 63.6 N in January and July injecting 17 MT and 200 MT SO2 at 24 km with and without halogens are simulated, in line with Central American Volcanic Arc and Icelandic volcanic eruptions. Simulated changes in the stratospheric sulfate and halogen burdens, and related impacts on aerosol optical depth, radiation, ozone and surface climate are analyzed. These simulated volcanic eruption cases will be compared with simulations based on the aerosol-climate model MAECHAM5-HAM.

How to cite: Zhuo, Z., Fuglestvedt, H., Toohey, M., Mills, M. J., and Krüger, K.: Model comparison of volcanic aerosol forcing and climate impact of tropical and extratropical eruptions, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15581,, 2021.

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