July 22, 2016

Trapped air bubbles in the ice core

Air bubbles in the ice core.

Today we have drilled ice cores with enclosed air bubbles. Our first results reveal that the close off depth is around 62 m and at tbe end of today we reached the depth 87.09 m. The greenhouse gas trapped here is probably from AD1850 (Field leaders poor estimate), the period where the increase of greenhouse gasses started.

What we have done today:

1. Drilled and logged the EGRIP ice core
2. Worked on changing drill configaration
3. Resampled snow surface profile in the clean snow area
4. Finished lowering the floor in the core buffer
5. Cleaned up in Carpenters garage
6. Cleaned up in Mechanic garage

Ad. 1: Logging depth: 87.09 m (10 runs (43-52), 11.28 m)

Ad. 2: Steff and Trevor had some problems with the power supply for rotating the drill. The power supply seems to shut down at a certain level.

Ad. 5: Empty zarges boxes will be packed on a pallet for retro to Kangerlussuaq (Numbers of the boxes will be noted down for the database)

Weather today: Blue sky all day. Temperatures -10°C during night and evening and up to -4°C in the day. Wind 5 kn from SW night and evening increasing to 15 kn from SW during the day.

FL, Dorthe Dahl-Jensen

Steff and Trevor are drilling.

Mika, Emilie and Bo are logging the ice cores.