Replicating the Regional Hadley Cell Response to Increased CO2 in CMIP6

In response to CO2, the Hadley Cells are projected to expand and weaken in a zonal-mean perspective. However, this perspective does not allow for regional patters and direct societal impacts to be studied. I re-examine this response on a regional scale by comparing the response of the Hadley Cell edge with that of the regional streamfunction. Regionally, the Hadley Cells strengthen where they expand and weaken where they contract. I test the robustness of this result across climate models using the pre-industrial control and abrupt quadrupling of CO2 simulations from the Coupled Model Intercomparison Project, Phase 6 (CMIP6). Looking into the response on a seasonal and regional basis provides the opportunity to better understand the nuances of atmospheric circulations and societal impacts to increased CO2.