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Drilling Industry News

New Antarctic Drilling Record

January 1, 2007
In mid-December, the Antarctic Geological Drilling Program drilled to a new record depth of more than 3,280 feet below the seafloor in Antarctica, making it the most successful Antarctic drilling program to date in terms of depth and rock core recovered.


The Antarctic Geological Drilling (ANDRILL) Program drilled to a new record depth of more than 3,280 feet below the seafloor from the site on the Ross Ice Shelf near Scott Base in Antarctica mid-December, making ANDRILL the most successful Antarctic drilling program in terms of depth and rock core recovered. They seek data that will illuminate how the Antarctic has responded to and shaped 35 million years of climate.

ANDRILL, a multinational collaboration of more than 200 scientists, students and educators. aims to drill into the past to better understand how fast, how large and how frequently glacial and interglacial changes occurred in the Antarctic. Robert DeConto of UMass Amherst is heading the modeling component of the program. “Obviously, we’re thrilled with the quality and quantity of data coming from the drilling,” says DeConto. “We’re anxious to begin incorporating this new information into our climate and ice sheet models.”

The information coming from the drill core will be used to test numerical models developed by DeConto’s research group and colleagues at the Pennsylvania State University, which predict ice sheet and ice shelf behavior under various conditions.

This first season of drilling is aimed at learning about the long-term behavior of the Ross Ice Shelf, a huge floating glacier about the size of France, sitting between the west and east Antarctic ice sheets. Ice shelves are important because they impede the flow of glacial ice into the ocean, explains DeConto. Because the ice covering Antarctica contains about 230 feet of equivalent sea level, even modest changes can have a big impact on the world’s coastal areas.

“Hopefully, knowing something about how the ice shelf has responded to past climate changes will warn us about possible surprises in the future,” he says.

So far, the drill cores tell a story of a dynamic Antarctic ice sheet advancing and retreating more than 50 times during the last 5 million years. Some of the disappearances of the ice shelf probably were during past times when our planet was approximately 36 degrees F to 37 degrees F warmer than it is today – “much like it will be in the next 50 to 100 years,” notes Tim Naish of Victoria University, the other co-chief scientist on the McMurdo Ice Shelf Project.
 
The operations team of 25 drillers, engineers and support staff are excited about reaching 3,280 feet, ANDRILL project manager Jim Cowie says. The previous record of 3,277 feet was set in 2000 by the Ocean Drilling Program’s drill ship, the Joides Resolution.

Much of the technical success of the project can be attributed to Alex Pyne, who has overseen the design and fabrication of the drilling system, says Lou Sanson chief executive of Antarctic New Zealand, which is managing the on-ice drilling operations and logistics on behalf of the ANDRILL partner nations.

Pyne, from Victoria University of Wellington, New Zealand, is a veteran of 30 years of scientific drilling in the McMurdo Sound region. He acknowledges that much of the present success is due to lessons learned from previous drilling projects and a dedicated team who have brought to the project a wide range of expertise and experience.

“The key to scientific drilling is delivering high-quality core to the scientists, and we have consistently had better than 98 percent core recovery,” says Pyne, who also was the technical expert behind the Cape Roberts Project that drilled to a depth of 3,082 feet below the sea floor. Pyne says reaching 3,280 feet is “great for the drilling team who take a lot of pride in their work, but our eyes are still firmly focused on the target depth of [3,937 feet].”

More information about ANDRILL is available at www.andrill.org.

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