Overview

I am a Senior Lecturer in the Department of Mathematics and Global Systems Institute.

I have recently started in Exeter (in June 2020), following a PhD in Atmospheric, Oceanic, and Planetary Physics at Oxford, almost four years as a postdoc in the Department of Earth and Planetary Sciences at Johns Hopkins University, and 18 months as a research fellow in the School of Geographical Sciences at the University of Bristol (where I still have an honorary affiliation).

I am interested in understanding the large-scale dynamics of the atmosphere and oceans of Earth (and sometimes other planets too). I use a combination of idealised models, comprehensive general circulation models, and observational data. My current particular interests include:

• Polar vortex dynamics on Earth,Mars, and Titan
• Jet stream and Hadley cell variability
• Stratospheric ozone depletion
• Southern Ocean-atmosphere interactions

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Publications

_{Copyright Notice: Any articles made available for download are for personal use only. Any other use requires prior permission of the author and the copyright holder.}

| 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2014 | 2013 | 2012 |

2024

• Lewis NT, England MR, Screen JA, Geen R, Mudhar R, Seviour WJM, Thomson SI. (2024) Assessing the Spurious Impacts of Ice-Constraining Methods on the Climate Response to Sea-Ice Loss using an Idealised Aquaplanet GCM. [PDF]
• Lewis N, Seviour W, Roberts-Straw H, Screen J. (2024) The Response of Surface Temperature Persistence to Arctic Sea-Ice Loss, DOI:10.31223/x5sd6z.
• Lewis NT, Seviour WJM, Roberts‐Straw HE, Screen JA. (2024) The Response of Surface Temperature Persistence to Arctic Sea‐Ice Loss, Geophysical Research Letters, volume 51, no. 2, DOI:10.1029/2023gl106863. [PDF]

2023

• Kent C, Scaife AA, Seviour WJM, Dunstone N, Smith D, Smout-Day K. (2023) Identifying Perturbations That Tipped the Stratosphere Into a Sudden Warming During January 2013, GEOPHYSICAL RESEARCH LETTERS, volume 50, no. 24, article no. ARTN e2023GL106288, DOI:10.1029/2023GL106288. [PDF]
• Ball ER, Seviour WJM, Mitchell DM. (2023) The Importance of Isentropic Mixing in the Formation of the Martian Polar Layered Deposits, The Planetary Science Journal, volume 4, no. 11, DOI:10.3847/psj/ad045d.
• Geen R, Thomson SI, Screen JA, Blackport R, Lewis NT, Mudhar R, Seviour WJM, Vallis GK. (2023) An Explanation for the Metric Dependence of the Midlatitude Jet‐Waviness Change in Response to Polar Warming, Geophysical Research Letters, volume 50, no. 21, DOI:10.1029/2023gl105132. [PDF]
• de Speville CD, Seviour WJM, Lo YTE. (2023) Predicting future UK nighttime urban heat islands using observed short-term variability and regional climate projections, ENVIRONMENTAL RESEARCH LETTERS, volume 18, no. 10, article no. ARTN 104044, DOI:10.1088/1748-9326/acf94c. [PDF]
• Hall RJ, Mitchell DM, Seviour WJM, Wright CJ. (2023) Surface hazards in North-west Europe following sudden stratospheric warming events, Environmental Research Letters, volume 18, no. 6, DOI:10.1088/1748-9326/acd0c3.

2022

• Thomas J, Stone EJ, Mitchell DM, Seviour W, Barnes C, Bloomfield H, Crook J, Jones H, MacLeod C. (2022) Organising a collaborative online hackathon for cutting‐edge climate research, Weather, volume 77, no. 6, pages 221-226, DOI:10.1002/wea.4199. [PDF]
• Seviour WJM. (2022) Good ozone, bad ozone and the Southern Ocean, NATURE CLIMATE CHANGE, volume 12, no. 4, pages 316-317, DOI:10.1038/s41558-022-01322-8. [PDF]
• Hall RJ, Mitchell DM, Seviour WJM, Wright CJ. (2022) How Well Are Sudden Stratospheric Warming Surface Impacts Captured in CMIP6 Climate Models?, Journal of Geophysical Research: Atmospheres, volume 127, no. 7, DOI:10.1029/2021jd035725. [PDF]

2021

• Wright CJ, Hall RJ, Banyard TP, Hindley NP, Mitchell DM, Seviour WJM. (2021) Dynamical and Surface Impacts of the January 2021 Sudden Stratospheric Warming in Novel Aeolus Wind Observations, MLS and ERA5, volume 2021, pages 1-39, DOI:10.5194/wcd-2021-16.
• Wright CJ, Hall RJ, Banyard TP, Hindley NP, Krisch I, Mitchell DM, Seviour WJM. (2021) Dynamical and surface impacts of the January 2021 sudden stratospheric warming in novel Aeolus wind observations, MLS and ERA5, Weather and Climate Dynamics, volume 2, no. 4, pages 1283-1301, DOI:10.5194/wcd-2-1283-2021.
• Mitchell DM, Scott RK, Seviour WJM, Thomson S, Waugh DW, Teanby NA, Ball ER. (2021) Polar vortices in planetary atmospheres, DOI:10.1002/essoar.10508571.1.
• Mitchell DM, Scott RK, Seviour WJM, Thomson SI, Waugh DW, Teanby NA, Ball ER. (2021) Polar Vortices in Planetary Atmospheres, Reviews of Geophysics, volume 59, no. 4, DOI:10.1029/2020rg000723. [PDF]
• Ball ER, Mitchell DM, Seviour WJM, Thomson SI, Vallis GK. (2021) The roles of latent heating and dust in the structure and variability of the northern Martian polar vortex, DOI:10.48550/arxiv.2104.00503.
• Polvani LM, Banerjee A, Chemke R, Doddridge EW, Ferreira D, Gnanadesikan A, Holland MA, Kostov Y, Marshall J, Seviour WJM. (2021) Interannual SAM Modulation of Antarctic Sea Ice Extent Does Not Account for Its Long‐Term Trends, Pointing to a Limited Role for Ozone Depletion, Geophysical Research Letters, volume 48, no. 21, DOI:10.1029/2021gl094871. [PDF]
• Hall RJ, Mitchell DM, Seviour WJM, Wright CJ. (2021) Persistent Model Biases in the CMIP6 Representation of Stratospheric Polar Vortex Variability, Journal of Geophysical Research: Atmospheres, volume 126, no. 12, DOI:10.1029/2021JD034759.
• Ball ER, Mitchell DM, Seviour WJM, Thomson SI, Vallis GK. (2021) The roles of latent heating and dust in the structure and variability of the northern Martian polar vortex, 2021, Volume 2, Pages 203. [PDF]
• Hall RJ, Mitchell DM, Seviour WJM, Wright CJ. (2021) Tracking the Stratosphere‐to‐Surface Impact of Sudden Stratospheric Warmings, Journal of Geophysical Research: Atmospheres, volume 126, no. 3, DOI:10.1029/2020jd033881. [PDF]
• Sharkey J, Teanby NA, Sylvestre M, Mitchell DM, Seviour WJM, Nixon CA, Irwin PGJ. (2021) Potential vorticity structure of Titan's polar vortices from Cassini CIRS observations, Icarus, volume 354, DOI:10.1016/j.icarus.2020.114030.

2020

• Walker E, Mitchell D, Seviour W. (2020) The numerous approaches to tracking extratropical cyclones and the challenges they present, Weather, volume 75, no. 11, pages 336-341, DOI:10.1002/wea.3861.
• Mitchell DM, Eunice Lo YT, Seviour WJM, Haimberger L, Polvani LM. (2020) The vertical profile of recent tropical temperature trends: Persistent model biases in the context of internal variability, Environmental Research Letters, volume 15, no. 10, pages 1040b4-1040b4, DOI:10.1088/1748-9326/ab9af7. [PDF]
• Scott RK, Seviour WJM, Waugh DW. (2020) Forcing of the Martian polar annulus by Hadley cell transport and latent heating, Quarterly Journal of the Royal Meteorological Society, volume 146, no. 730, pages 2174-2190, DOI:10.1002/qj.3786. [PDF]
• Sharkey J, Teanby NA, Sylvestre M, Mitchell DM, Seviour WJM, Nixon CA, Irwin PGJ. (2020) Mapping the zonal structure of Titan's northern polar vortex, Icarus, volume 337, pages 113441-113441, article no. 113441, DOI:10.1016/j.icarus.2019.113441. [PDF]

2019

• Seviour WJM, Codron F, Doddridge EW, Ferreira D, Gnanadesikan A, Kelley M, Kostov Y, Marshall J, Polvani LM, Thomas JL. (2019) The Southern Ocean Sea Surface Temperature Response to Ozone Depletion: A Multimodel Comparison, JOURNAL OF CLIMATE, volume 32, no. 16, pages 5107-5121, DOI:10.1175/JCLI-D-19-0109.1. [PDF]

2018

• Waugh DW, Grise KM, Seviour WJM, Davis SM, Davis N, Adam O, Son S-W, Simpson IR, Staten PW, Maycock AC. (2018) Revisiting the Relationship among Metrics of Tropical Expansion, Journal of Climate, volume 31, no. 18, pages 7565-7581, DOI:10.1175/jcli-d-18-0108.1. [PDF]
• Seviour WJM, Davis SM, Grise KM, Waugh DW. (2018) Large Uncertainty in the Relative Rates of Dynamical and Hydrological Tropical Expansion, Geophysical Research Letters, volume 45, no. 2, pages 1106-1113, DOI:10.1002/2017gl076335. [PDF]

2017

• Seviour WJM, Waugh DW, Scott RK. (2017) The Stability of Mars’s Annular Polar Vortex, Journal of the Atmospheric Sciences, volume 74, no. 5, pages 1533-1547, DOI:10.1175/jas-d-16-0293.1. [PDF]
• Seviour WJM, Gnanadesikan A, Waugh D, Pradal M-A. (2017) Transient Response of the Southern Ocean to Changing Ozone: Regional Responses and Physical Mechanisms, Journal of Climate, volume 30, no. 7, pages 2463-2480, DOI:10.1175/jcli-d-16-0474.1. [PDF]
• Gnanadesikan A, Scott AA, Pradal M, Seviour WJM, Waugh DW. (2017) Regional Responses to Black Carbon Aerosols: The Importance of Air‐Sea Interaction, Journal of Geophysical Research: Atmospheres, volume 122, no. 23, DOI:10.1002/2017jd027589. [PDF]
• Seviour WJM. (2017) Weakening and shift of the Arctic stratospheric polar vortex: Internal variability or forced response?, Geophysical Research Letters, volume 44, no. 7, pages 3365-3373, DOI:10.1002/2017gl073071. [PDF]
• Seviour WJM, Waugh DW, Polvani LM, Correa GJP, Garfinkel CI. (2017) Robustness of the Simulated Tropospheric Response to Ozone Depletion, Journal of Climate, volume 30, no. 7, pages 2577-2585, DOI:10.1175/jcli-d-16-0817.1. [PDF]

2016

• Seviour WJM, Gnanadesikan A, Waugh DW. (2016) The Transient Response of the Southern Ocean to Stratospheric Ozone Depletion, Journal of Climate, volume 29, no. 20, pages 7383-7396, DOI:10.1175/jcli-d-16-0198.1. [PDF]
• Seviour WJM, Gray LJ, Mitchell DM. (2016) Stratospheric polar vortex splits and displacements in the high‐top CMIP5 climate models, Journal of Geophysical Research: Atmospheres, volume 121, no. 4, pages 1400-1413, DOI:10.1002/2015jd024178. [PDF]

2014

• Seviour WJM, Hardiman SC, Gray LJ, Butchart N, MacLachlan C, Scaife AA. (2014) Skillful Seasonal Prediction of the Southern Annular Mode and Antarctic Ozone, JOURNAL OF CLIMATE, volume 27, no. 19, pages 7462-7474, DOI:10.1175/JCLI-D-14-00264.1. [PDF]

2013

• Seviour WJM, Mitchell DM, Gray LJ. (2013) A practical method to identify displaced and split stratospheric polar vortex events, Geophysical Research Letters, volume 40, no. 19, pages 5268-5273, DOI:10.1002/grl.50927. [PDF]

2012

• Seviour WJM, Butchart N, Hardiman SC. (2012) The Brewer-Dobson circulation inferred from ERA-Interim, QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, volume 138, no. 665, pages 878-888, DOI:10.1002/qj.966. [PDF]

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