The temperature inversion is holding steady. Eureka enjoyed temperatures around -41°C, as well as light snow and clouds. The PEARL Ridge Lab, in wonderful contrast, enjoyed temperatures around -14°C, with clear skies above and sun! Dan took photos of the clouds from above at the Ridge Lab , while Sham took photos of the clouds from below. This is useful context to have for the lidar measurements.
In the PEARL Ridge Lab's IR lab, Dan took 90 MIR measurements with the Bruker remotely with his laptop. Dan also took 51 measurements with PARIS. Joseph again ran the suntracker remotely from his laptop. Fully enabling remote measurements will take more work (e.g. we would need to install a liquid nitrogen filler, precipitation sensor, etc.) but great progress is being made towards this goal.
This morning, Paul did his daily checks on SPS, MAESTRO and the Brewer. The SPS and tracker programs were not running. It appears the computer had rebooted with a Windows Update. Paul restarted the tracker and SPS program, and they continued on with measurements.
Sophie had a busy day in the UV-Vis lab. She analyzed data while the GBSs and SAOZ took measurements nominally. Paul and Sophie tried to figure out how often the time of the PEARL-GBS suntracker PC synchronizes to the local server. Following Yan's advice, they discovered it synchronizes every hour. This is satisfactory.
It was the 7th day of continuous CRL measurements down at 0PAL. Sham worked on deciding where to place a beam dump on the optics table. This will remove the hot spot made by the UV laser beam.
Today's ACE ozonesonde flight was launched at 6:15 PM (local time) and reached an altitude of 33 189 meters (6.8 hPa).