EGU23-4474, updated on 04 Jun 2024
https://doi.org/10.5194/egusphere-egu23-4474
EGU General Assembly 2023
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Initial meteorological conditions and eruption source parameters control on volcanic forcing

Kirstin Krüger1, Zhihong Zhuo1, Herman Fuglestvedt1, Mike Mills2, and Matthew Toohey3
Kirstin Krüger et al.
  • 1University of Oslo, Meteorology and Oceanography, Department of Geosciences, Oslo, Norway
  • 2NCAR, Boulder, USA
  • 3University of Saskatchewan, Canada

Studying impacts of past volcanic eruptions on climate and society relies on volcanology, paleo proxies and archaeological records next to climate model simulations. Here we newly study the control of varying meteorological conditions and eruption source parameters on the volcanic forcing. Simulating explosive tropical and extratropical Northern Hemisphere (NH) volcanic eruptions are carried out by co-injecting sulfur and halogens into the stratosphere with the CESM2(WACCM) model including aerosol, chemistry, climate, and earth system processes. We consider different initial meteorological conditions (ENSO, QBO, and polar vortex states) and varying eruption source parameters injecting 17 Tg and 200 Tg of SO2 together with scaled halogens, at 24 km altitude and 15° N and 64° N latitude, during January and July pre industrial 1850 conditions. Varying initial meteorological conditions reveal a similar large impact on the volcanic forcing (SO2, SO4, aerosol optical depth, halogens) as varying source parameters for both tropical and NH extratropical eruptions. Our results are compared with available model experiments from MAECHAM5-HAM. Consequences and uncertainties of volcanic forcing and responses to past and future eruptions are discussed. 

How to cite: Krüger, K., Zhuo, Z., Fuglestvedt, H., Mills, M., and Toohey, M.: Initial meteorological conditions and eruption source parameters control on volcanic forcing, EGU General Assembly 2023, Vienna, Austria, 23–28 Apr 2023, EGU23-4474, https://doi.org/10.5194/egusphere-egu23-4474, 2023.