Johnson, Jill, Dr

Dr Jill Johnson

School of Mathematical and Physical Sciences

Lecturer in Statistics

jill.johnson@sheffield.ac.uk
+44 114 222 3703

I11, Hicks Building

Full contact details

Dr Jill Johnson
School of Mathematical and Physical Sciences
I11
Hicks Building
Hounsfield Road
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S3 7RH

Profile

Dr Johnson studied at Newcastle University, graduating in 2010 with a PhD in Statistics. Her thesis was titled ‘Modelling Dependence in Extreme Environmental Events’. Following this, she worked in the civil service as a research statistician at the government’s Food and Environment Research Agency, looking at uncertainty quantification and risk analysis for multiple applications including food safety and land use change.

In December 2012, Dr Johnson returned to academia as a research associate in the aerosol research group at the Institute for Climate and Atmospheric Science, University of Leeds, where her work focussed on the quantification and constraint of key uncertainties in complex models of the atmosphere and climate.

In August 2021 she joined the School of Mathematics and Statistics as a Lecturer in Statistics.

Research interests

Uncertainty quantification for computer models; Surrogate modelling (emulation); Model-observation comparison (history matching).

My research interests are in the development and practical application of statistical methods to quantify, assess and then reduce uncertainty in large-scale complex models of real-world systems. To date, I have focussed on problems in environmental science and particularly in relation to the atmosphere and climate: I have worked with a range of models on different scales including the simulation of an individual cloud, to the simulation of a cloud field, to the simulation of the global distribution of aerosols in the atmosphere. My approaches include expert elicitation to inform parameter choices, the use of surrogate statistical models (Gaussian process emulation) to enable dense sampling over a complex model’s input uncertainties, sensitivity analysis to understand the driving sources of uncertainty and ‘history matching’ to reduce uncertainty via comparison to observations.

In my research, I aim to address the statistical challenges of model-observation comparison to constrain the effects of high-dimensional model parameter uncertainty when using diverse observations that have sparse spatial and temporal coverage, and to explore model uncertainty when a model output is non-stationary.

Publications

Journal articles

Sansom RWN, Carslaw KS, Johnson JS & Lee L (2024) . Journal of Advances in Modeling Earth Systems, 16(9).
Regayre LA, Deaconu L, Grosvenor DP, Sexton DMH, Symonds C, Langton T, Watson-Paris D, Mulcahy JP, Pringle KJ, Richardson M , Johnson JS et al (2023) . Atmospheric Chemistry and Physics, 23(15), 8749-8768.
Reyes-Villegas E, Lowe D, Johnson JS, Carslaw KS, Darbyshire E, Flynn M, Allan JD, Coe H, Chen Y, Wild O , Archer-Nicholls S et al (2023) . Atmospheric Chemistry and Physics, 23(10), 5763-5782.
Vander Hoorn S, Johnson JS, Murray K, Smit R, Heyworth J, Lam S & Cope M (2022) . Atmosphere, 13(12).
Sansom R, Lee L, Johnson J, Regayre L & Carslaw K (2022) .
Hawker RE, Miltenberger AK, Johnson JS, Wilkinson JM, Hill AA, Shipway BJ, Field PR, Murray BJ & Carslaw KS (2021) . Atmospheric Chemistry and Physics, 21(23), 17315-17343.
Marshall LR, Schmidt A, Johnson JS, Mann GW, Lee LA, Rigby R & Carslaw KS (2021) . Journal of Geophysical Research: Atmospheres, 126(13).
Sexton DMH, McSweeney CF, Rostron JW, Yamazaki K, Booth BBB, Murphy JM, Regayre L, Johnson JS & Karmalkar AV (2021) . Climate Dynamics, 56(11-12), 3395-3436.
Sengupta K, Pringle K, Johnson JS, Reddington C, Browse J, Scott CE & Carslaw K (2021) . Atmospheric Chemistry and Physics, 21(4), 2693-2723.
Glassmeier F, Hoffmann F, Johnson JS, Yamaguchi T, Carslaw KS & Feingold G (2021) . Science, 371(6528), 485-489.
Pope CA, Gosling JP, Barber S, Johnson JS, Yamaguchi T, Feingold G & Blackwell PG (2021) . Technometrics, 63(1), 53-63.
Peace AH, Carslaw KS, Lee LA, Regayre LA, Booth BBB, Johnson JS & Bernie D (2020) . Environmental Research Letters, 15(9).
Regayre LA, Schmale J, Johnson JS, Tatzelt C, Baccarini A, Henning S, Yoshioka M, Stratmann F, Gysel-Beer M, Grosvenor DP & Carslaw KS (2020) . Atmospheric Chemistry and Physics, 20(16), 10063-10072.
Johnson JS, Regayre LA, Yoshioka M, Pringle KJ, Turnock ST, Browse J, Sexton DMH, Rostron JW, Schutgens NAJ, Partridge DG , Liu D et al (2020) . Atmospheric Chemistry and Physics, 20(15), 9491-9524.
Watson-Parris D, Bellouin N, Deaconu LT, Schutgens NAJ, Yoshioka M, Regayre LA, Pringle KJ, Johnson JS, Smith CJ, Carslaw KS & Stier P (2020) . Geophysical Research Letters, 47(9).
Park JM, van den Heever SC, Igel AL, Grant LD, Johnson JS, Saleeby SM, Miller SD & Reid JS (2020) . Journal of Geophysical Research: Atmospheres, 125(6).
Wellmann C, Barrett AI, Johnson JS, Kunz M, Vogel B, Carslaw KS & Hoose C (2020) . Atmospheric Chemistry and Physics, 20(4), 2201-2219.
Yoshioka M, Regayre LA, Pringle KJ, Johnson JS, Mann GW, Partridge DG, Sexton DMH, Lister GMS, Schutgens N, Stier P , Kipling Z et al (2019) . Journal of Advances in Modeling Earth Systems, 11(11), 3728-3754.
Schmale J, Baccarini A, Thurnherr I, Henning S, Efraim A, Regayre L, Bolas C, Hartmann M, Welti A, Lehtipalo K , Aemisegger F et al (2019) . Bulletin of the American Meteorological Society, 100(11), 2260-2283.
Glassmeier F, Hoffmann F, Johnson JS, Yamaguchi T, Carslaw KS & Feingold G (2019) . Atmospheric Chemistry and Physics, 19(15), 10191-10203.
Fanourgakis GS, Kanakidou M, Nenes A, Bauer SE, Bergman T, Carslaw KS, Grini A, Hamilton DS, Johnson JS, Karydis VA , Kirkevåg A et al (2019) . Atmospheric Chemistry and Physics, 19(13), 8591-8617.
Marshall L, Johnson JS, Mann GW, Lee L, Dhomse SS, Regayre L, Yoshioka M, Carslaw KS & Schmidt A (2019) . Journal of Geophysical Research: Atmospheres, 124(2), 964-985.
Wellmann C, Barrett AI, Johnson JS, Kunz M, Vogel B, Carslaw KS & Hoose C (2019) . Journal of Advances in Modeling Earth Systems, 10(12), 3103-3122.
Johnson JS, Regayre LA, Yoshioka M, Pringle KJ, Lee LA, Sexton DMH, Rostron JW, Booth BBB & Carslaw KS (2018) . Atmospheric Chemistry and Physics, 18(17), 13031-13053.
Regayre LA, Johnson JS, Yoshioka M, Pringle KJ, Sexton DMH, Booth BBB, Lee LA, Bellouin N & Carslaw KS (2018) . Atmospheric Chemistry and Physics, 18(13), 9975-10006.
Carslaw K, Lee L, Regayre L & Johnson J (2018) . Eos, 99.
Igel AL, van den Heever SC & Johnson JS (2018) . Journal of Geophysical Research: Atmospheres, 123(1), 22-37.
Butt EW, Turnock ST, Rigby R, Reddington CL, Yoshioka M, Johnson JS, Regayre LA, Pringle KJ, Mann GW & Spracklen DV (2017) . Environmental Research Letters, 12(10).
Reddington CL, Carslaw KS, Stier P, Schutgens N, Coe H, Liu D, Allan J, Browse J, Pringle KJ, Lee LA , Yoshioka M et al (2017) . Bulletin of the American Meteorological Society, 98(9), 1857-1877.
Carslaw KS, Gordon H, Hamilton DS, Johnson JS, Regayre LA, Yoshioka M & Pringle KJ (2017) . Current Climate Change Reports, 3(1), 1-15.
Feingold G, McComiskey A, Yamaguchi T, Johnson JS, Carslaw KS & Schmidt KS (2016) . Proceedings of the National Academy of Sciences, 113(21), 5812-5819.
Johnson JS, Cui Z, Lee LA, Gosling JP, Blyth AM & Carslaw KS (2015) . Journal of Advances in Modeling Earth Systems, 7(1), 162-187.
Johnson JS, Gosling JP & Kennedy MC (2011) . Journal of Statistical Planning and Inference, 141(5), 1838-1848.
Johnson JS, Regayre LA, Yoshioka M, Pringle KJ, Lee LA, Sexton D, Rostron J, Booth BBB & Carslaw KS () .
Regayre L, Johnson J, Yoshioka M, Pringle K, Sexton D, Booth B, Lee L, Bellouin N & Carslaw K () .
Falloon P, Challinor A, Dessai S, Hoang L, Johnson J & Koehler A-K () . Frontiers in Environmental Science, 2.

Preprints

Sansom RWN, Carslaw KS, Lee L & Johnson JS (2024) , Authorea, Inc..
Regayre LA, Deaconu L, Grosvenor DP, Sexton DMH, Symonds C, Langton T, Watson-Paris D, Mulcahy JP, Pringle KJ, Richardson M , Johnson JS et al (2023) , Copernicus GmbH.
Regayre LA, Deaconu L, Grosvenor DP, Sexton D, Symonds CC, Langton T, Watson-Paris D, Mulcahy JP, Pringle KJ, Richardson M , Johnson JS et al (2022) , Copernicus GmbH.
Reyes-Villegas E, Lowe D, Johnson J, Carslaw KS, Darbyshire E, Flynn M, Allan JD, Coe H, Chen Y, Wild O , Archer-Nicholls S et al () , Copernicus GmbH.

Research group: Statistics

Teaching activities: MAS113