Robert Graham

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Robert Graham

DPhil student in AOPP

Ahoyhoy, my name is R.J. Graham. I'm a DPhil student in AOPP working in Ray Pierrehumbert's group. Currently my research is focused on modeling geochemical climate feedbacks on rocky planets. I'm supported by a Clarendon Scholarship.

I use models of varying complexity to study the atmospheres and climatic evolution of Earth and hypothetical "Earth-like" exoplanets. Currently I am focused on the feedback of silicate weathering on atmospheric CO2 levels and global climate for temperate planets. I have also used GCM simulations to explore the dynamics of terrestrial planetary atmospheres during snowball events. With my research, I aim to understand the processes that initiate, maintain, threaten, and end habitability for wet, rocky worlds like Earth. How unique is our planet?


Shaw, T. A. and R. J. Graham, 2020: Hydrological cycle changes explain weak Snowball Earth storm track despite increased surface baroclinicity, Geophysical Research Letters, DOI: 10.1029/2020GL089866.

Graham, R. J. and R. T. Pierrehumbert, 2020: Thermodynamic and Energetic Limits on Continental Silicate Weathering Strongly Impact the Climate and Habitability of Wet, Rocky Worlds, Astrophysical Journal, DOI: 10.3847/1538-4357/ab9362.

Graham, R. J., T. A. Shaw and D. S. Abbot, 2019: The snowball stratosphere, Journal of Geophysical Research - Atmospheres, DOI: 10.1029/2019JD031361.

Abbot, D.S., J. Bloch-Johnson, J. Checlair, N. X. Farahat, R. J. Graham, D. Plotkin, P. Popovic, and F. Spaulding-Astudillo, 2018: Decrease in Hysteresis of Planetary Climate for Planets with Long Solar Days, Astrophysical Journal, DOI: 10.3847/1538-4357/AAA70F.


Graham, R. J., 2021: High pCO2 reduces sensitivity to CO2 perturbations on Earth-like planets throughout most of habitable zone, submitted.

Graham, R.J., T. Lichtenberg, R. Boukrouche, and R. Pierrehumbert, 2021: A multi-component moist pseudoadiabat with arbitrary retained condensate fraction, submitted.

In prep

Graham, R.J., T. Lichtenberg, and R. Pierrehumbert, 2021: Carbon cycle hysteresis from CO2 condensation on terrestrial planets, in prep.