The team worked at the Ridge Lab on March 22 and 24 to continue measurements and instrument maintenance. We worked from the Weather Station on March 23.

On March 22, Kevin and Petra went to the Ridge Lab rooftop to reposition the Environment and Climate Change Canada camera to point at the UT-GBS dome and FTIR Robodome. Petra ran mid- and near-infrared FTIR measurements both days we visited the Ridge Lab. She also recorded a full day of near-infrared spectra on Sunday March 23, because we were working from the Weather Station. The team wound down with Weather Station staff at a fun, arctic-themed paint night on the evening of March 22.

On March 24, Darby stayed at the Weather Station to work at 0PAL and updated the sky scan azimuth direction for the Pandora to yield the maximum zenith angle range for the scans, which will point at a set of inclinations from zenith (straight up) to horizontal along 257.7deg from North, across the fjord, and be used to calculate vertical distributions of trace gases in the atmosphere. There are mountains across the fjord, so Petra and Darby used the elevation maps to estimate whether the new direction allows horizontal scans and determined that they are far enough away that, despite being about 450 m high, the view is unobstructed. The Pandora operated nominally.

Cheers,
Darby Bates
[on behalf of the 2025 Canadian Arctic ACE/OSIRIS Validation Campaign team]