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ANDRILL's 2nd Antarctic drilling season exceeds all expectations
Date:11/27/2007

he future behavior of Antarctic ice sheets. This stratigraphic record will be used to determine the behavior of ancient ice sheets, and to better understand the factors driving past ice sheet, ice shelf and sea-ice growth and decay. This new knowledge will enhance our understanding of Antarctica's potential responses to future global climate changes.

After a seven-week setup period by Antarctica New Zealand during late winter in the Southern Hemisphere, drilling began Oct. 9 and continued until last week, with the drillers recovering 25 to 70 meters of core each day. There was only one major interruption, occurring in early November when sand and water flowed into the drill hole, but Harwood said the drill team "did an awesome job" of fixing the problem.

Following the planned drilling stoppage at the end of last week, scientists lowered a variety of scientific instruments into the deep drill hole over several days to get a better understanding of the physical properties of the geologic layers under pressure and to obtain an acoustic image of the inside of the borehole. Drilling resumed this week and will continue until probably Sunday to recover about 100 meters of additional core.

The first stop for each core section after recovery is the Crary Science and Engineering Center, operated by the U.S. National Science Foundation at McMurdo Station. After preliminary examination by on-ice scientists, the cores are shipped to Florida State University's Antarctic Marine Geology Research Facility in Tallahassee for storage and long-term study.


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Contact: Tom Simons
tsimons1@unl.edu
402-472-8514
University of Nebraska-Lincoln
Source:Eurekalert

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