A great expanse of ice

by Guest Blogger

August 1, 2005

Today I had an interesting experience. I accompanied a scientist up onto

the ice sheet to drill for ice core samples. I’ll make the distinction

between glaciers and ice sheets by saying 82% (at least) of Greenland is

covered by a massively thick layer of ice. At its centre it’s 3

kilometres (1.9 miles) thick. That’s the ice sheet.

When the ice sheet

gets close to the coast, it squeases out between the coastal mountains.

What is squishing out between the mountains are glaciers. So a glacier,

big as it is, pales in comparison to the immensity of the ice sheet.

We were on the ice sheet on the east coast of Greenland. Just a big

sea of featureless ice white landscape, stretching away all the way to

the west coast hundreds of miles away. It was blindingly white. The

helicopter pilot complained that the landscape was so featureless that

he had a hard time landing, as it was hard to tell how far above the ice

he was. There was no reference point. Just a smooth white surface as far

as the eye could see.

The ice coring machine was driven by a small two stroke engine and

consisted of a hollow tube which was called the auger and pipes which were

added above it as it’s depth increased. The auger was 1.5 metres (5 feet)

long and cut a cylinder of ice about 10 cm wide x 1.5 metres (4 inches

x 5 feet) long. Sections of pipe were added above the auger as it went

deeper.

As it went deeper it became heavier and more difficult to

retrieve. Once we drilled down a further 1.5 metres we stoped and pulled

everything out of the hole to retrieve the bottom auger section.

The

auger section contained the core sample. We carefully pushed the sample out

of the auger. Then we measured it, weighed it, photographed it, sectioned it

into 20 cm lengths, quarterede the sections, then recorded and bagged the

quartered section. There were usually 5 to 6 sections per core sample.

Then we would reassembled the auger and drilling pipe, adding another

metre of drill pipe and started the process again.

We woke up at 05:00 a.m., got to the ice sheet at 05:30, and got back to the

ship at 13:00 p.m. We worked steadily during our time on the ice and

managed to drill to a depth of 11 metres. According to Jason Box (Ohio

State Geography/Byrd Polar Research Center), the scientist for the ice

sampling, we ended by drilling ice from the summer of 2003. Eleven

metres of compressed snow and ice in two years!

I’m impressed. But then again everything thing about Greenland leaves an

impression on me.

peace and love,

phil

We Need Your Voice. Join Us!

Want to learn more about tax-deductible giving, donating stock and estate planning?

Visit Greenpeace Fund, a nonprofit, 501(c)(3) charitable entity created to increase public awareness and understanding of environmental issues through research, the media and educational programs.