University of Rochester

Jesse L. Rosenberger Seminar Series

Snapshots of Early and Mid Pleistocene Climate and Atmospheric Composition from the Allan Hills Blue Ice Area, Antarctica

John Higgins, PhD, Assistant Professor Princeton University, Department of Geosciences

Friday, November 10, 2017
3:00 p.m.–4:00 p.m.
University of Rochester River Campus, Dewey Hall, Room 2-110D

UR photo

Cosponsored by the Department of Earth & Environmental Sciences and the Center for Energy & Environment

Summary:

John Higgins' research interests are the global carbon cycle and the processes that stabilize Earth’s climate and control the chemistry of its atmosphere and oceans on geologic timescales. His group approaches these topics using laboratory experiments, analytical measurements of stable and radiogenic isotope ratios, and numerical models of ocean and atmosphere chemistry. Dr. Higgins will discuss the recent discovery of the oldest documented ice core and the atmospheric greenhouse gas concentrations associated with it. Dated at 2.7 Ma, this ice core provides insights into the CO2 concentration of Earth's atmosphere at the onset of a major global cooling event that led to the advance of ice sheets in the Northern Hemisphere.