I study nonlinear climate dynamics, which explores the ways in which the climate's response to perturbations such as humanity's CO2 emissions can become disproportionately stronger or weaker over time. This response is partly determined by how the atmosphere reacts to surface temperature changes. My past research has explored how this atmospheric reaction can depend on the temperature change's location (the "pattern effect"; see papers  and  below) and on how much temperature change has already occurred ("feedback temperature dependence"; see papers  and ). For more information, you can watch my April 2023 talk to the ECS Symposium or my talk for the 2021 AGU Fall Meeting.
I am the lead organizer of the forthcoming Green's Function Model Intercomparison Project (GFMIP), which explores the response of the atmosphere to the spatial field of sea surface temperature change. I worked with Maria Rugenstein to create the LongRunMIP data archive, which was the first collection of thousand-plus year simulations of coupled atmosphere-ocean general circulation models. I help organize the ECS Symposium, a monthly climate dynamics discussion group. I also was the lead organizer of the first Rossbypalooza summer school.
I work with Eric Potash on Is The Weather Weird?, which allows you to see how weird the current temperature in a number of locations is compared to the past. Thanks for reading, and feel free to send me an email at firstname.lastname@example.org.
Bloch-Johnson and Gregory: Nonlinear Climate Sensitivity. Part 2: A Closer Look at Spatial Feedbacks
Bloch-Johnson and Gregory: Nonlinear Climate Sensitivity. Part 1: A Taxonomy
Risi and co-authors, including Bloch-Johnson: Amplification of temperature changes with altitude in the tropics and subtropics