It has been unusually cold at both Eureka and PEARL's Ridge Lab. The Eureka Weather Station measured a low temperature this morning of -49.9 °C. By mid-afternoon it had only risen to -48 °C. At PEARL, the temperature during the afternoon remained near -38 °C; the wind made it feel like -55 °C. The wind made conditions feel especially cold when Joseph, Debora and Dan ventured outside to walk along a nearby Ridge and visit an inuksuk near PEARL.
In the PEARL Ridge Lab's IR lab, Joseph and Dan took 48 mid-infrared measurements. Since the weather was stable, sunny and clear, they were able to use an automatic measurement macro mid- afternoon. Debora took 26 measurements with PARIS. In the evening, Debora watched the launch of an ozonesonde, and learned about the procedure from Wes, an Environment Canada meteorological technician at the Eureka Weather Station.
Xiaoyi spent the day in much the same manner as yesterday: conducting resolution tests for the UT-GBS. He worked on refocusing the light onto the CCD and has achieved the same resolution as last year. He plans to move the UT-GBS back to the mezzanine tomorrow. By comparing its data with the PEARL-GBS, he will be able to further examine the impact of the new optics.
Volodya spent today at the Eureka Weather Station to install Brewer 192 on the instrument platform. Due to a data cable problem, it is not yet operational.
Overnight and into the morning at 0PAL, Chris (working remotely from Dalhousie University) took measurements with the CRL lidar for 9 hours (midnight to 9am). The weather was clear enough to also perform an alignment. This hadn't been possible recently due to ice crystals in the air. Today, Emily and Pierre inspected the roof hatch window, and Emily continued the depolarization analysis. This evening, Chris started up the lidar again and plans to take measurements all night.
Today's ACE ozonesonde flight occurred at 18:15 and reached an altitude of 30,602 m and 8.0 millibars.