Jim Cochran


Measuring Gravity From a Moving Aircraft Requires a ‘Gravi-God’!

From: Joël Dubé, Engineer/Geophysicist at Sander Geophysics, OIB P-3 Gravity Team One of the instruments used in Operation IceBridge (OIB) is an airborne gravimeter operated through a collaboration between Lamont Doherty Earth Observatory of Columbia University and Sander Geophysics of Ottawa, Canada.  People from other instrument teams have been heard to call it a gravity… read more

by |May 18, 2011
The Geikie Plateau on Greenland's Eastern Coast (photo copyright Michael Studinger, NASA)

A 30 year history of measuring Greenland’s Breathtaking Vistas

We flew our last science flight out of Kangerlussuaq Base (western Greenland) over the Geikie Peninsula, on the east coast of Greenland. This high priority mission had not been completed prior to this because of difficult weather in the peninsula area. The mission focus was to determine how the surface ice elevation and ice thickness… read more

by |April 28, 2011
Flying low over the outlet glaciers (photo M. Wolovick)

Soaring Through the Southeastern Greenland Outlet Glaciers

Our mission was to collect some long survey lines down the center of some of Greenland’s most spectacular southeastern glaciers. The study design would require us to complete a transect across the Greenland ice sheet, fortunately at a location when the country undergoes a noticeable taper. Starting at Kangerlussuaq, our base on Greenland’s west coast,… read more

by |April 25, 2011
Jakobshavn Glacier's heavily broken and crevassed surface as the rapidly moving ice deforms as it flows. Photo credit P. Spector

Jakobshavn Glacier continues to provide surprises!

We have moved south! One of the many challenges of our Greenland survey is the need to switch bases in the midst of the season since Thule Air Force Base also serves as a staging location for a major resupply mission for many of the Arctic outposts.  The whole set up has to be packed… read more

by |April 7, 2011

Dog sled races link back to a centuries old tradition

One of the events that Thule looks forward to hosting each year is Armed Forces Day. The festival attracts several hundred people, both Inuit families and Air Force personnel. Held on the ice of North Star Bay, the events include broomstick hockey, snowmobile rides, helicopter rides, children’s craft activities and dog sled races. The dog… read more

by |April 11, 2010

The weight of ice

Taking off amidst snow flurries we are headed completely across the Greenland ice cap to the northeast corner of of the country. This flight will differ from most of the DC-8 flights during the Ice Bridge 2010 Greenland campaign. The DC-8 flights are mainly used to measure sea ice or surface mapping with high altitude… read more

by |April 3, 2010

Ice Cube Science

We have flown three flights in the last week, with a fourth postponed as winds were too high for take off. Two of the flights have focused on sea ice in the Arctic. The first was flown north of Canada’s Ellsmere Island, where thick multiyear ice tends to accumulate. We examined the thickness of that… read more

by |March 30, 2010

Following Arctic Leads

Our ICE Bridge team of 34 scientists and NASA personnel has piled mounds of equipment, luggage, and emergency Arctic survival gear into the DC-8, setting off just before midnight for Thule, Greenland. All but two of the seats are filled, and every possible open area has been piled with our supplies for the next few… read more

by |March 24, 2010

California ‘shake down’ starts Greenland trip!

Jim Cochran, Geophysicist, Lamont-Doherty Earth Observatory ICE Bridge scientists gathering at NASA’s Dryden Flight Research Center (DFRC) in Palmdale, CA for our upcoming Greenland mission were greeted in true California style. We were awakened by a magnitude 4.4 earthquake in the middle of the night! Although small by California standards the event was centered only about… read more

by |March 22, 2010