Herman Fæhn Fuglestvedt

• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn; Toohey, Matthew & Krüger, Kirstin (2024). Initial atmospheric conditions control transport of volcanic volatiles, forcing and impacts. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 24(10), s. 6233–6249. doi: 10.5194/acp-24-6233-2024.
• Fuglestvedt, Herman Fæhn; Zhuo, Zhihong; Toohey, Matthew & Krüger, Kirstin (2024). Volcanic forcing of high-latitude Northern Hemisphere eruptions. npj Climate and Atmospheric Science. ISSN 2397-3722. 7(1), s. 1–12. doi: 10.1038/s41612-023-00539-4.
• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn; Toohey, Matthey & Krüger, Kirstin (2023). Initial conditions control transport of volcanic volatiles, forcing and impacts. Atmospheric Chemistry and Physics Discussions (ACPD). ISSN 1680-7367. doi: 10.5194/egusphere-2023-2374.
• Fuglestvedt, Herman & Haerter, Jan O. (2020). Cold Pools as Conveyor Belts of Moisture. Geophysical Research Letters. ISSN 0094-8276. 47(12). doi: 10.1029/2020GL087319. Fulltekst i vitenarkiv

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• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn; Toohey, Matthew; Mills, Michael J. & Krüger, Kirstin (2022). Impacts of tropical versus extratropical volcanic eruptions co-injecting sulphur and halogen to the stratosphere.
• Krüger, Kirstin; Fuglestvedt, Herman Fæhn; Van Dijk, Evelien; Zhuo, Zhihong; Sigl, Michael & Toohey, Matthew (2022). Modelling volcanic climate and environmental impacts and their signals in ice cores.
• Krüger, Kirstin; Fuglestvedt, Herman Fæhn; Zhuo, Zhihong; Mills, Mike & Sigl, Michael (2022). Volcanic sulfate deposition to Greenland and Antarctica: A modeling sensitivity study with CESM(WACCM). Vis sammendrag

  Reconstructions of the atmospheric sulfate aerosol burdens resulting from past volcanic eruptions are based on ice core-derived estimates of volcanic sulfate deposition and the assumption that the two quantities are directly proportional. Toohey et al (2013) modelled that the Antarctic and Greenland volcanic sulfate deposition is nonlinear for very large sulfur rich tropical eruptions (Tambora magnitude and larger), with significantly less sulfate deposition to Antarctica than to Greenland using the MAECHAM5-HAM aerosol-climate model. Here we test the relationship for simulations of explosive tropical and extratropical Northern Hemisphere volcanic eruptions 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 eruption parameters varying composition, latitude, season, injection height and magnitude. We run the model injecting 17 Tg and 200 Tg of SO2, together with scaled halogens, at 24 km altitude 15° N and 64° N during January and July pre industrial 1850 conditions. We will analyse the modelled sulphate deposition signals over Greenland and Antarctica and compare them to the volcanic ice core records of known eruptions of comparable strength during the Common Era and the Holocene. The analysis will focus on the deposition fluxes and their Greenland/Antarctica efficiencies in relation to the eruption parameters, sulphate aerosol transport, and the atmospheric circulation and deposition. With the help of the model data we will learn more about the volcanic sources to the sink processes, which will be helpful to better interpret volcanic signals in bipolar ice core records.

• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn; Toohey, Matthew; Mills, Michael J & Krüger, Kirstin (2022). Impacts of tropical versus extratropical volcanic eruptions co-injecting sulphur and halogen to the stratosphere.
• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn & Krüger, Kirstin (2022). Impacts of tropical versus extratropical volcanic eruptions co-injecting sulfur and halogen to the stratosphere.
• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn; Toohey, Matthew & Krüger, Kirstin (2022). Impacts of tropical versus extratropical volcanic eruptions with sulphur and halogen injections to the stratosphere.
• Fuglestvedt, Herman Fæhn (2022). High-Latitude Explosive Volcanic Eruptions and Their Sensitivity to Source Parameters.
• Fuglestvedt, Herman Fæhn (2022). Arctic Polar Vortex Controls Aerosol Evolution After High-Latitude Volcanic Eruptions.
• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn & Krüger, Kirstin (2021). Impacts of tropical versus extratropical volcanic eruptions (including volcanic sulphur and halogen injections).
• Fuglestvedt, Herman Fæhn; Zhuo, Zhihong; Mills, Michael J. & Krüger, Kirstin (2021). Modelling the atmospheric impacts of high-latitude explosive volcanic eruptions.
• Fuglestvedt, Herman Fæhn; Zhuo, Zhihong; Michael, Mills & Krüger, Kirstin (2021). Modelling the atmospheric impacts of high-latitude explosive volcanic eruptions.
• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn; Toohey, Matthew; Mills, Michael J. & Krüger, Kirstin (2021). Model comparison of stratospheric aerosol forcing of tropical and extratropi-cal volcanic eruptions. Vis sammendrag

  Major volcanic eruptions, as one of the natural forcing, increase sulfate aerosols in the stratosphere. The stratospheric aerosol forcing differs from tropical and extratropical eruptions, and depends on the eruption season and height, and volcanic volatile injections. In order to study different aerosol forcing and their impact, we perform simulations based on the fully coupled Community Earth System Model version 2 (CESM2) with the Whole Atmosphere Community Climate Model version 6 (WACCM6) with prognostic stratospheric aerosol and chemistry. Explosive eruptions at 14.6 N and 63.6 N in January and July injecting 17 Tg and 200 Tg 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 impacts on aerosol optical depth and ozone are analyzed.

• Zhuo, Zhihong; Fuglestvedt, Herman Fæhn; Toohey, Matthew; Mills, Michael J. & Krüger, Kirstin (2021). Model comparison of aerosol forcing and impactof tropicaland extratropical eruptions.
• Fuglestvedt, Herman; Krüger, Kirstin; Zhuo, Zhihong; Sigl, Michael; Toohey, Matthew & Mills, Michael J. (2021). Modelling high-latitude explosive eruptions and their atmospheric and environmental impacts .
• Zhuo, Zhihong; Fuglestvedt, Herman; Toohey, Matthew; Mills, Michael J. & Krüger, Kirstin (2021). Model comparison of volcanic aerosol forcing and climate impact of tropical and extratropical eruptions.
• Fuglestvedt, Herman & Kirstin, Krüger (2020). Modelling the Atmospheric Forcing of High-Latitude Volcanic Eruptions.

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