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Yusuf Hamied Department of Chemistry


Environmental and climatic effects of volcanic gases and aerosols

I am an Interdisciplinary Lecturer in Climate Modelling jointly affiliated with the Departments of Chemistry and Geography. I combine expertise in atmospheric science, climate modelling, and volcanology to advance the current understanding of volcanic impacts and hazards. In particular, I investigate the impact of volcanism on atmospheric chemistry, climate, air quality, human health, ecosystems and aviation using a wide range of atmospheric models and volcanological datasets. I am particularly interested in continuously degassing volcanoes and effusive Icelandic volcanic eruptions and their effects on air quality and climate. I am convinced that these eruptions serve as a perfect natural lab and can help better understand and quantify aerosol-cloud interactions.

Recent research

I have extensively studied the most recent Icelandic eruption at Holuhraun (Bárðarbunga volcano). Starting in August 2014, Holuhraun erupted effusively for 6 months and emitted up to nine times as much sulphur dioxide per day as all European industry combined, which led to a measureable episodic degradation of air quality across Northern Europe in September 2014 (see Schmidt et al., 2015). Combining satellite observations with numerical modelling, we were also able to demonstrate that the eruption had a discernable effect on the brightness of low-level clouds over the North Atlantic (Gettelman et al., 2015; Malavelle et al., 2017).


Increased respiratory morbidity associated with exposure to a mature volcanic plume from a large Icelandic fissure eruption.
HK Carlsen, E Ilyinskaya, PJ Baxter, A Schmidt, T Thorsteinsson, MA Pfeffer, S Barsotti, F Dominici, RG Finnbjornsdottir, T Jóhannsson, T Aspelund, T Gislason, U Valdimarsdóttir, H Briem, T Gudnason
– Nature communications
Model physics and chemistry causing intermodel disagreement within the VolMIP-Tambora Interactive Stratospheric Aerosol ensemble
M Clyne, JF Lamarque, MJ Mills, M Khodri, W Ball, S Bekki, SS Dhomse, N Lebas, G Mann, L Marshall, U Niemeier, V Poulain, A Robock, E Rozanov, A Schmidt, A Stenke, T Sukhodolov, C Timmreck, M Toohey, F Tummon, D Zanchettin, Y Zhu, OB Toon
– Atmospheric Chemistry and Physics
Co-emission of volcanic sulfur and halogens amplifies volcanic effective radiative forcing
J Staunton-Sykes, TJ Aubry, YM Shin, J Weber, LR Marshall, NL Abraham, A Schmidt, A Archibald
– Atmospheric Chemistry and Physics Discussions
The 2019 Raikoke volcanic eruption: Part 1 Dispersion model simulations and satellite retrievals of volcanic sulfur dioxide
J de Leeuw, A Schmidt, CS Witham, N Theys, IA Taylor, RG Grainger, RJ Pope, J Haywood, M Osborne, NI Kristiansen
– Atmospheric Chemistry and Physics Discussions
Evidence for the predictability of changes in the stratospheric aerosol size following volcanic eruptions of diverse magnitudes using space-based instruments
LW Thomason, M Kovilakam, A Schmidt, C Von Savigny, T Knepp, L Rieger
– Atmospheric Chemistry and Physics
Reconciling the climate and ozone response to the 1257 CE Mount Samalas eruption
DC Wade, CM Vidal, NL Abraham, S Dhomse, PT Griffiths, J Keeble, G Mann, L Marshall, A Schmidt, AT Archibald
– Proceedings of the National Academy of Sciences of USA
Large Variations in Volcanic Aerosol Forcing Efficiency Due to Eruption Source Parameters and Rapid Adjustments
LR Marshall, CJ Smith, PM Forster, TJ Aubry, T Andrews, A Schmidt
– Geophysical Research Letters
ARTN e2020GL090241
Spatial and Temporal Variations in SO2 and PM2.5 Levels Around Kīlauea Volcano, Hawai'i During 2007–2018
RCW Whitty, E Ilyinskaya, E Mason, PE Wieser, EJ Liu, A Schmidt, T Roberts, MA Pfeffer, B Brooks, TA Mather, M Edmonds, T Elias, DJ Schneider, C Oppenheimer, A Dybwad, PA Nadeau, C Kern
– Frontiers in Earth Science
A New Volcanic Stratospheric Sulfate Aerosol Forcing Emulator (EVA_H): Comparison With Interactive Stratospheric Aerosol Models
TJ Aubry, M Toohey, L Marshall, A Schmidt, AM Jellinek
– Journal of Geophysical Research: Atmospheres
Modeled and Observed Volcanic Aerosol Control on Stratospheric NOy and Cly
B Zambri, S Solomon, DE Kinnison, MJ Mills, A Schmidt, RR Neely, AE Bourassa, DA Degenstein, CZ Roth
– Journal of Geophysical Research: Atmospheres
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Research Group

Research Interest Group

Telephone number

01223 336369

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