Personal profile
Research interests
My research interests lie in Earth System Modeling and in the use of these models to understand and predict climate variability and change at spatial scales ranging from the planetary to the regional and on timescales from seasonal to multi-decadal. I seed to determine robust responses to climate change and their implications through a deeper understanding of the processes and mechanisms involved and to understand the origins of both natural and forced variability in the historical record. I am also interested in the biases that occur in Earth System Models and how they may be alleviated and what the implications of these biases are for our ability to predict the future of the climate system. To date, I have focussed on the dynamics of the tropospheric mid-latitude circulation, regional hydroclimate, the coupled stratosphere-troposphere system, land-atmosphere coupling, historical trends in the observational record and their representation in models, the use of emergent constraints to constrain long-term climate projections, and sub-seasonal to decadal prediction.
Teaching
Course notes from Advanced Atmospheric Dynamics course at the University of Toronto (2011)
Related documents
Education/Academic qualification
Physics, PhD, Imperial College
Physics, MS, University of Saint Andrews
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Collaborations and top research areas from the last five years
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CMIP7 Data Request: atmosphere priorities and opportunities
Dingley, B., Anstey, J. A., Abalos, M., Abraham, C., Bergman, T., Bock, L., Fiddes, S., Hassler, B., Kramer, R. J., Luo, F., O'Connor, F. M., Šácha, P., Simpson, I. R., Wilcox, L. J. & Zelinka, M. D., Apr 17 2026, In: Geoscientific Model Development. 19, 7, p. 2945-2984 40 p.Research output: Contribution to journal › Article › peer-review
Open Access2 Scopus citations -
Externally-Forced Changes to Southern Hemisphere Stratosphere-Troposphere Coupling Variability
Butler, A. H., Lim, E. P. & Simpson, I. R., Mar 2026, In: Earth's Future. 14, 3, e2025EF007334.Research output: Contribution to journal › Article › peer-review
Open Access -
Gaps and ways forward in atmospheric blocking and extreme weather research
Wang, L., Lu, J., Breeden, M. L., Chen, G., Henderson, S. A., Narinesingh, V., Simpson, I. R., Woollings, T., Hu, Y. & Lubis, S. W., Mar 24 2026, In: Nature Communications. 17, 1Research output: Contribution to journal › Review article › peer-review
Open Access -
Increased Model Resolution Amplifies Boreal Winter Arctic Precipitation and Atmospheric Circulation Response to Sea Ice Loss
Sun, L., Wills, R. C. J., Deser, C., Herrington, A., Simpson, I. R. & Gervais, M., May 2026, In: Journal of Climate. 39, 9, p. 2039-2060 22 p.Research output: Contribution to journal › Article › peer-review
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Is the High ECS in CESM2 Degrading Transient Climate Change Projections Over the 21st Century?
Duffy, M. L., Simpson, I. R., Medeiros, B., Zhu, J., McCluskey, C. S., Herrington, A. R., Gettelman, A., Otto-Bliesner, B. L., Fasullo, J. T., Lauritzen, P. H., Neale, R. B. & Lawrence, D. M., Jan 2026, In: Journal of Advances in Modeling Earth Systems. 18, 1, e2025MS004967.Research output: Contribution to journal › Article › peer-review
Open Access
Prizes
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2024 Editor's citation for Excellence in Refereeing, JGR Atmospheres
Simpson, I. (Recipient), 2025
Prize: External Award
Activities
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The impacts of vertical resolution on seasonal predictability in a new CESM suite of seasonal hindcasts
Simpson, I. (Speaker)
Jun 11 2025Activity: Give a talk or presentation › Oral presentation
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Berkeley Atmospheric Sciences Symposium
Simpson, I. (Speaker)
Mar 7 2025Activity: Give a talk or presentation › Invited talk
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A global discrepancy in atmospheric humidity trends between models and observations
Simpson, I. (Speaker)
Feb 26 2025Activity: Give a talk or presentation › Invited talk
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Is water availability from the land surface in arid/semi-arid regions mis-represented in CESM?
Simpson, I. (Speaker)
Feb 24 2025Activity: Give a talk or presentation › Oral presentation
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A global discrepancy in atmospheric water vapor trends between models and observations
Simpson, I. (Speaker)
Feb 12 2025Activity: Give a talk or presentation › Oral presentation
Press/Media
Datasets
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CESM2 83-level simulations
Simpson, I. (Creator) & Rosenbloom, N. (Creator), NSF NCAR - National Center for Atmospheric Research, Jun 3 2024
DOI: 10.5065/S125-CA92
Dataset
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CESM2 single forcing large ensemble description paper
Simpson, I. (Creator), NSF NCAR - National Center for Atmospheric Research, Feb 25 2023
DOI: 10.5065/p0vq-t219
Dataset
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Observed humidity trends in dry regions contradict climate models
Simpson, I. (Creator), NSF NCAR - National Center for Atmospheric Research, Sep 27 2023
DOI: 10.5065/5jz0-0n57
Dataset
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Simpson et al (2021) Emergent constraints
Simpson, I. (Creator), NSF NCAR CISL - Information Sciences Division, Apr 28 2021
DOI: 10.5065/wz6y-5e82
Dataset
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CAM6 Prescribed SST AMIP Ensembles
Phillips, A. (Creator) & Simpson, I. (Creator), NSF NCAR - National Center for Atmospheric Research, Dec 2 2020
DOI: 10.26024/800d-nj44
Dataset