I am a postdoctoral researcher at the University of Reading, working with Jonathan Gregory. I study the sensitivity of the Earth's climate to changes in the composition of the atmosphere, and how that sensitivity, and our estimates of it, can evolve over time. I use a range of approaches, including building simple mathematical models, running computer simulations that try to capture the full complexity of the Earth system, and analyzing observations of the Earth's recent past, as well as proxies of the climate of the distant past. I am co-organizer, with Maria Rugenstein, of LongRunMIP, which is an archive of millenial-scale runs of coupled general circulation models. I also organized the first Rossbypalooza, a workshop bringing together climate scientists and statisticians for a week-long hackathon and lecture series. If you want to learn more about my research, you can watch my talk for the 2021 AGU Fall Meeting.

Main Publications

• Bloch-Johnson, Rugenstein, Stolpe, Rohrschneider, Zheng, and Gregory, 2021: Climate sensitivity increases under higher CO₂ levels due to feedback temperature dependence GRL link pdf SI
• Bloch-Johnson, Rugenstein, and Abbot, 2020: Spatial radiative feedbacks from internal variability using multiple regression J. Climate link pdf SI
• Rugenstein, Bloch-Johnson, Gregory, Andrews, Mauritsen, Li, Frölicher, Paynter, Danabasoglu, Yang, Dufresne, Cao, Schmidt, Abe-Ouchi, Geoffroy, and Knutti, 2019: Equilibrium climate sensitivity estimated by equilibrating climate models GRL link pdf
• Rugenstein, Bloch-Johnson, Abe-Ouchi, Andrews, Beyerle, Cao, Chadha, Danabasoglu, Dufresne, Duan, Foujols, Frölicher, Geoffroy, Gregory, Knutti, Li, Marzocchi, Mauritsen, Menary, Moyer, Nazarenko, Paynter, Saint-Martin, Schmidt, Yamamoto, and Yang, 2019: LongRunMIP - motivation and design for a large collection of millennial-length AO-GCM simulations BAMS link pdf
• Bloch-Johnson, Pierrehumbert, and Abbot, 2015: Feedback temperature dependence determines the risk of high warming GRL link pdf SI

Other Publications

• Cael, Britten, Calafat, Bloch-Johnson, Stainforth, and Goodwin: Climate nonlinearities: selection, uncertainty, projections, and damages in review
• Rohrschneider, Bloch-Johnson, and Rugenstein: Does feedback temperature dependence influence the slow mode of the climate response? in review
• Zhang, Bloch-Johnson, Romps, and Abbot, 2021: Evolving CO₂ Rather Than SST Leads to a Factor of Ten Decrease in GCM Convergence Time, JAMES link
• Callahan, Chen, Rugenstein, Bloch-Johnson, Yang, Stein, and Moyer, 2021: Robust decrease in El-Niño/Southern Oscillation amplitude under long-term warming Nature Climate Change link
• Schwarzwald, Poppick, Rugenstein, Bloch-Johnson, Wang, McInerney, and Moyer, 2021: Changes in future precipitation mean and variability across scales J. Climate link
• Abbot, Bloch-Johnson, Checlair, Farahat, Graham, Plotkin, Popovic, and Spaulding-Astudillo, 2018: Decrease in hysteresis of planetary climate for planets with long solar days The Astrophysical Journal link pdf
• Köhler, Stap, von der Heydt, de Boer, van de Wal, and Bloch-Johnson, 2017: A state-dependent quantification of climate sensitivity based on paleodata of the last 2.1 million years Paleoceanography link