On a day as today, when winds are blowing the snow around, large snow drifts may form over night. If we parked our vehicles randomly, we may get large drifts that need to be removed in the morning. Or perhaps snow drifts would made us become stuck when starting out for driving the next morning. Also, the order of how the vehicles are parked has been carefully considered. In the front, our main generator delivering power to the whole camp is placed. Both the living/kitchen module and the sleeping module, which are next to each other for practical reasons, receive power from the main generator. We keep the upwind area clean and this area is designated for science. ...

Written 8 December, 2007 3604 meters above sea level Maximum & Minimum temperatures: - 29 °C to - 36 °C Yesterday’s breezy conditions evolved overnight into strong winds with a lot of blowing snow, making today’s conditions the worst for visibility that we have experienced since our departure from Troll. Our goal for today is to travel all day and make good progress toward our next drilling site. Fortunately, with GPS navigation and no known obstacles between here and the drill site, we have been able to push ahead in spite of the poor conditions. The wind makes a striking difference on the ice sheet. Thursday morning it was -30 C, with clear skies, almost no wind, and walking and working on the ice sheet was pleasant. Bare cheeks were fin...

Written December 7, 2007 3589 meters above sea level Minimum temperature: -45 °C When drilling ice cores, one important task is to establish a precise dating of the core, i.e. know the age of the ice at certain depths. There are several methods for dating an ice core including using fallouts from the nuclear test bomb explosions as horizons of known age. We are drilling down to 7.5 meters to capture the well known radioactive reference layers from 1955 and 1965. These are later identified in the laboratory by measuring the Total ß-radioactivity. This contribution is from the log of the Norw...

Written 6 December, 2007 3589 meters above sea level Minimum temperature: -41 °C One of the associated projects that we accommodate on the traverse is to collect samples for studies of concentrations of black carbon in the snow pack. Black carbon originates from the industrialized parts of the world and is transported to the Polar Regions through the atmosphere. Presence of black carbon efficiently reduces the surface albedo, i.e. how efficient the surface reflects solar radiation. The lower the albedo, the more solar energy is absorbed at the surface which in turn can reduce the albedo even more by changi...

Written December 5, 2007 3585 meters above sea level After traveling all day, tonight we set camp at a location where satellite imagery told us we would experience very different snow structure across an expanse of several kilometers. Standing outside the vehicles and looking out across the expanse of the ice sheet, on casual inspection it looked pretty much the same in all directions; very small surface roughness with evidence of shifting winds, including occasional patches of shiny wind-induced surface polish. Yet our crevasse-detection radar had recently begun showing signs of unusual vertical fe...

Contents: 1. IPY Science Day: Ice Sheets, December 13th 2007 2. AGU 3. Data Coordinators 4. IPO in December 5. IPY Events and Conferences 6. Logos and Clothing 7. Two recent meetings 8. Blog on IPY.org From: IPY International Programme Office To: IPY Project Coordinators cc: IPY Community Google Groups 1. IPY Science Day: Ice Sheets, December 13th 2007 December 13th marks the second IPY Science Day, focussing on Ice Sheets. You can find information from more than 20 IPY Projects researching various aspects of Ice Sheets on ipy.org, as well as an educational flier, in 16 languages, and information for teachers and media. Show your involve...

Written December 3, 2007 3590 meters above sea level With a sense of accomplishment, this noon we bid farewell to the packed snow and the lone temperature array transmitter, which is all that was left to mark our drilling site 91. Under a cool, cloudless sky, the horizon looked identical in all directions: flat and white, with lighter sky near the horizon fading into a deep blue straight up. Very small patterns formed by drifted snow, less than ten centimeters high, now provide the major surface features. Such a huge expanse dominated by the smallest of features! The calm, clear, sunny day makes th...

Written December 3, 2007 3587 meters above sea level Minimum temperature: -47 °C Clear, sunny skies today made it possible for a long-planned flight to visit us at site 91. We said good-bye to three of the part-time traverse crew, Tom, Unni, and Torbjørn, who are heading back to their jobs and families. They were a big help and also a joy to be with, and we will miss their company as we continue the traverse toward South Pole. Today was also a special day, almost like Christmas, for our lead mechanic, Kjetil, who received six differentials for the vehicles! Two have broken so far on the traverse, and Kjetil has been able to replace them in the field. We are all hoping that now that we have plenty of extras, they will not be needed! ...

Written 2 December, 2007 3587 meters above sea level Minimum temperature: -45 °C Now that we have been here at Site 91 for three days, several of the main tasks here are done, and the list of things to do is becoming shorter. The big event yesterday was finishing the 90 meter ice core (well, 90.40 meters actually). Drilling went so well that the core was finished almost a day early. Mary and Tom also finished the work in the snow pit by measuring the thermal conductivity and grain size, and collecting samples for stereology, stable isotope analyses, and trace chemistry. Atsu and Jan...

Written December 1, 2007 3587 meters above sea level Today was our second day here at Site 91, and we were again fortunate to have excellent weather to continue with our work. The drilling progressed nicely, reaching 59 meters by the end of the day, while Atsu coordinated the shallow drilling and recovered two more 7 meter cores. At sites with very little snowfall (less than 10 cm of snowfall each year) and very low annual temperature (mean annual temperature ~ -50 °C) drilling can be a challenge, particularly in the upper 5 meters. Close to the surface, snow grains metamorphose from very...