2011-2012 Distinguished Lecturer – Stephen Pekar

DR. STEPHEN PEKAR

Queens College

2011-2012 Distinguished Lecturer

Past Climate Changes in Antarctica: Looking Back to Our Future

Carbon dioxide levels are predicted to rise during this century to levels not seen in 25 to 45 Ma. During this time, the Earth changed from a generally ice-free “greenhouse world” to a more much colder and heavily glaciated “icehouse world.”  The climate on Antarctica shifted from a continent that supported expansive temperate forests and small ephemeral ice sheets, to the cold polar desert of today.

Recently, the IODP Expedition 318, Wilkes Land Glacial History, recovered sedimentary cores off the coast of Antarctica that were deposited during the greenhouse (54-34 Ma) and icehouse (34-present) worlds. These cores are showing us what an Earth with elevated CO₂ world could look like; in essence, they are like “looking back to our future.” This talk will provide an overview of Antarctic climate changes when CO₂ levels were similar to what is predicted for this century and also provide some of the early results from the IODP Wilkes Land Glacial History Expedition.

Dr. Pekar has been a shipboard scientist on  ODP Leg 189 and IODP Expedition 318. He has also participated on several expeditions related to the ANDRILL program.

LECTURE SCHEDULE

September 22, 2011 – Georgia Southern University
September 30, 2011 – Florida State University
November 9, 2011 – SETI Institute
November 18, 2011 – Tufts University
January 23, 2012 – Western Michigan University
February 17, 2012 – Louisiana State University
February 24, 2012 – University of New Mexico
March 8, 2012 – New England Aquarium
April 11, 2012 – St. Lawrence University