Solar Geoengineering Seminar Series


Wednesday, May 1, 2019, 11:30am to 12:30pm


Museum of Comparative Zoology, 26 Oxford Street, Harvard University Center for the Environment, Room 429

Please note the change in time.

"Fast and Slow Climate System Responses to Solar Geoengineering"


Ken Caldeira, Senior Scientist, Department of Global Ecology, Carnegie Institution for Science, Stanford, California.


Amy Chang Lunch is provided with RSVP to:


David Keith, Faculty Associate; Chair, Weatherhead Initiative on Climate Engineering. Gordon McKay Professor of Applied Physics, Harvard John A. Paulson School of Engineering and Applied Sciences; Professor of Public Policy, Harvard Kennedy School.



Factors that affect the radiative forcing of climate rapidly alter the atmosphere before substantial change in ocean temperatures occur (fast climate response). Later, the climate system responds to changes in ocean temperature (slow climate response). Numerical simulations indicate that the fast climate response can differ markedly across radiative forcing agents but their slow responses are similar. Solar geoengineering largely 'works' because solar geoengineering is good at offsetting the slow climate response to greenhouse gas forcing. In contrast, most of the mismatches between solar geoengineering and greenhouse-gas induced warming is due to the differing characteristics of the fast response to different radiative forcing agents.