The EGRIP sign post has been updated with relevant information.
May 23, 2023
The EGRIP sign post has been updated with relevant information.
Today the borehole was logged. Because we are approaching the deepest part of the ice sheet, where there could be shearing occurring in the ice as it moves over the bedrock, we want to keep a close eye on any borehole deformation that may take place. We also want to monitor the inclination of the borehole and know the temperature profile. The logging shows a temperature in the deepest part of the borehole of -8.9°C, and that the drillers control of the drill orientation has successfully resulted in a decreased borehole inclination. Now the drill has been remounted to start drilling tomorrow.
The Greendrill science team went out to their site this morning to set up the camp. A bit of a rough experience as the wind is picking up. The Twin-Otter crew returned from the site and told us that all tents are up and camp is functional. Tomorrow the Twin-Otter will leave for Iceland and return in a weeks’ time to pick up the Greendrill team again.
Josie and Palle have been working on an acoustic ‘Pinger’ system to mount on the borehole lid. A sound emitted from the top of the borehole gets reflected in the surface of the bore hole drill liquid and detected at the surface, whereby the borehole liquid level can be determined. Fast changes in the borehole liquid will be used as an indicator of something unexpected happening at the bottom of the borehole.
What we did today:
Weather today: Clear, clear blue sky without a molecule of water vapor during day time. Temperatures -21°C to -27°C, but freezing cold due to wind chill of -45°C caused by westerly wind rising to 20 kt in the night. Overcast in the evening and initiation of snowdrift.
FL, Anders Svensson
Josie and Palle are working on the borehole Acoustic lid. Here they are testing it in the carpenters’ garage using spare fiberglass outer barrels for the drill, before fitting the lid to the borehole in the trench.