14 June 2010

Does weather show us a light at the end of the tunnel?

An endless ongoing task: removing snowdrifts
Sverrir is using the Pistenbully to remove the 4 m snowdrifts around the carpenters garage.

Today began as usual in the last five days: Warm, moderate wind and total cloud cover. But at dinner time (19.00) the clouds retracted to the northwest and camp experienced sunshine for the first time in several days. Many camp members rushed out and soon they had a ballgame going in the middle of camp.

What we have done today:
1. Drilling and logging.
2. Processed ice cores: 44 bags, from 3629 to 3673.
3. Measuring CFA. Measured 20.9 m. CFA depth: 1632.95 m.
4. Groomed skiway with beam groomer in zig-zag.
5. Removed snow from around carpenter garage.

Ad.1: Drillers report:
The good mode of the last 8 days disappeared when the pitch fell below 1.2 mm for five consecutive runs. We increased the pitch to 2.4 mm now (0.15 mm clearance at the lathe). This improved our situation in two ways.
First, we can again drill more than 3 meters per run, but with runs just at the limit of the motor current in pressure tube 1 at their termination. Second, we can now drill with negative cutter load which we hope will improve our borehole inclination. Previously we were obliged to drill with about 10 kg of load.

Driller's depth: 2071.90 meters. Logging depth: 2088.25 m.

Weather: Overcast all day, in the evening clearing up. Temp. -10 °C to -5 °C, 10 knots from S, then SW and SE. Visibility: Unrestricted, but poor surface contrast due to cloud cover.

FL, J.P. Steffensen 

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