President's Report Masthead
December 31, 2015

Professor’s research contributes to ‘the climate story’

Tim Lowenstein discussed the changing atmosphere, hydrosphere and biosphere from a geological perspective at the 2015 Harpur College Dean’s Distinguished Lecture.

Lowenstein, a professor of geology, has more than 25 years of experience studying sedimentology and geochemistry. He has examined ancient minerals to determine past levels of greenhouse gases, such as carbon dioxide.

“The greenhouse gases are a very important part of the climate story,” said Lowenstein, who spoke in Old Union Hall on Nov. 20. “As a geologist, we can study past climates and we can try to understand what the carbon dioxide (CO2) was in the atmosphere in the past.”

Lowenstein looked at a carbon dioxide-sensitive mineral, Nahcolite, to study past CO2 levels. Nahcolite forms under conditions with high heat and high levels of CO2.

According to Lowenstein, 50 million years ago there was 1,125 parts per million (ppm) of CO2, three times today’s value. In addition, Earth was about 20 degrees warmer than it is today.
“We extrapolate that there is a causal link between CO2, as a greenhouse gas, and temperature,” he said.

However, recent experiments have shown that Nahcolite can form at CO2 levels as low as 680 ppm, which is significantly lower than was previously thought.

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