Coronavirus Information for the UC San Diego Community

Our leaders are working closely with federal and state officials to ensure your ongoing safety at the university. Stay up to date with the latest developments. Learn more.

Geophysics seminar: Tamara Pico (Caltech)

01/21/2020 - 12:00pm
Revelle Conference Room (IGPP 4301)
Event Description: 

Tamara Pico, Caltech


Ice ages cycles are often described as comprising a slow glacial build-up phase followed by a rapid deglaciation. However, during much of the last ice age, global ice volumes are largely uncertain due to a sparsity of sea-level records. Furthermore, it is challenging to reconstruct individual ice sheet geometries because advancing ice sheets raze evidence of previous ice margins. I revisit two topics of considerable debate within these broader questions. The first is the timing of both the expansion of the ice-free corridor between the Cordilleran and Laurentide Ice Sheet and the flooding of the Bering Strait. In this case, I use observations of the Bering Strait flooding as sea-level indicators to fingerprint the timing and location of North American saddle deglaciation. The second is the geometry of the Laurentide Ice Sheet in the build-up toward Last Glacial Maximum. To investigate this issue, I use sea-level records from the U.S. east coast and glacial isostatic adjustment modeling to infer the large-scale growth history of North American ice sheets. I also demonstrate that ancient landscapes provide additional insight into ice loading histories, as rivers can faithfully record surface deformation, and I use geologic records of U.S. east coast rivers as a novel data set for inferring the history of glaciation.

For more information on this event, contact: 
Ignacio Sepulveda
Event Calendar: