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Drilling Industry News

Researchers Dig Deep into Bighorn Basin for Global Warming Clues

July 19, 2011
This month, researchers are undertaking a pioneering geological study in the Bighorn Basin of Wyoming to search for clues to a massive global warming event that occurred about 55 million years ago. A team of 27 scientists from 11 institutions will drill a series of cores into the basin’s stratified layers of rocks that they hope will yield better understanding of this mystery and – perhaps – of current and future global climate change.

Photo courtesy of Will Clyde/Bighorn Basin Coring Project.


About 55 million years ago, the Earth burped up a massive release of carbon dioxide into the atmosphere – an amount equivalent to burning all the petroleum and other fossil fuels that exist today. “And we don’t know where it came from,” says University of New Hampshire’s Will Clyde, associate professor of geology. “This is a big part of the carbon cycle that affected the climate system, and we don’t understand it.”

This month, Clyde is leading a pioneering National Science Foundation-funded geological study in the Bighorn Basin of Wyoming to search for clues to this event, which occurred during a period of extreme warming called the Paleocene-Eocene Thermal Maximum (PETM). A team of 27 scientists from 11 institutions will drill a series of cores into the basin’s stratified layers of rocks that they hope will yield better understanding of this mystery and – perhaps – of current and future global climate change.  

This field work, in an area just east of Yellowstone National Park near Cody, Wyo., will be the first time scientists have drilled continental cores in an attempt to better understand this release of carbon and the warming, an environmental anomaly called a hyperthermal event that surrounded it. Previous research has utilized ocean cores or more weathered rock outcroppings.

The sedimentary deposits in the semi-arid, 100-mile-wide Bighorn Basin created ideal conditions for studying the PETM. Drilling two-and-a-half-inch diameter cores more than 490 feet into the sediment, says Clyde, will advance research by providing pristine sediments on which scientists can do more precise geocehmical analyses.

“It will help us better understand the long-term carbon cycle of the Earth,” says Clyde, who chairs the Earth sciences department in UNH’s College of Engineering and Physical Sciences (CEPS).

It’s not just ancient history Clyde and his colleagues are interested in. Researchers suspect that the carbon release may have been a result of an initial rise in temperature during the PETM and they wonder whether current warming, due to global climate change, could launch a similar event. Further, the PETM provides insights into the carbon cycle, climate system, and how living organisms respond to environmental change.

“Could our dependence on carbon-based energy sources trigger one or more causes of prehistoric global warming, and, as a result, make our struggle with a warming earth far worse than currently predicted?” asks Clyde.

Between July 13 and Aug. 11, 2011, the scientists will drill pairs of cores at three sites – Polecat Bench, Gilmore Hill and Basin Substation – around the Bighorn Basin. In partnership with a professional drilling team, scientists will work around the clock for a week at each site; each core, says Clyde, could take three days to drill.

“The nature of these rocks makes them particularly hard to core,” he says, adding that because this type of scientific drilling has never been conducted on these kinds of deposits, the team will be pioneering some of this work.

Once collected, the cores will be shipped in refrigerated containers to the University of Bremen in Germany. Clyde and the team will visit that laboratory in January 2012 to continue studying the cores, measuring the isotopic signature of carbon residue in the rocks to determine the amount of carbon released into the atmosphere during hyperthermals.

Clyde is optimistic about the project’s ability to shed light on previous and potential global warming: “Hopefully, by looking at the past, we will better understand prospects for the long-term climate cycle that may or may not become our future.”

This research was funded by a $1.4 million grant from the National Science Foundation. In addition to Clyde, master’s students Abby D'Ambrosia and Jeremy Riedel and project manager Doug Schnurrenberger from UNH, and scientists from the following instutitions will participate: Universities of Michigan, Colorado, Wyoming, Birmingham (U.K.), and Bremen (Germany); Columbia, Northwestern, Pennsylvania State, Purdue and Utrecht (Netherlands) universities; the Smithsonian Institution; Bureau of Land Management; Denver Museum of Nature and Science; ExxonMobil; LacCore; NIOZ (Royal Netherlands Institute for Sea Research); and South Dakota School of Mines & Technology.

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Carbon Dioxide PETM

Brian Hoien
July 27, 2011
It was my understanding that this resulted from Methane release vs Carbon dioxide. Methane was released from ocean depths and of course methane is many times more of a problem when it comes to trapping heat. Brian Hoien, J&H Drilling Co Inc.

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