Weather in Eureka improved today. The sky was mostly clear, allowing for solar measurements. The temperature at the Eureka Weather Station was -32°C. At the PEARL Ridge Lab, the temperature was a relatively mild -15°C.
In the PEARL Ridge Lab's IR lab, Joseph took 58 MIR measurements and 50 NIR measurements with the Bruker. Debora took 54 measurements with PARIS, and ran retrievals.
Over in the UV-Vis Lab, PEARL-GBS, UT-GBS and SAOZ performed nominal measurements. Xiaoyi analyzed UT-GBS data. With the UV diffuser on the UT-GBS telescope, the spectra look good. Xiaoyi also calculated preliminary ozone and NO2 vertical column densities from March 3 to 11. No ozone depletion has been observed yet, even compared to measurements taken during last year's campaign.
Down at 0PAL, Emily tested the polarization of various calibration lamps, and tested the efficacy of optics meant to depolarize light. She tested various materials to determine which had the least overall attenuation while maintaining desired depolarization qualities. Emily also had a helpful discussion about this issue with Xiaoyi, who has also had to deal with polarization in his instrument. Chris ran the lidar remotely for 23.5 hours. 30 minutes were needed to conduct a polarization calibration test with the new selection of depolarizing optics blocking the lidar returns from the sky. Initial success! The lidar was only attenuated by 10% overall, which still leaves enough photons landing on the detectors for good statistics during calibration. They will be able to use this depolarizing optics set up during future campaign white light calibration tests.
Xiaoyi, Emily, and Dan filmed the last segment of the outreach video this afternoon. Emily and Dan then finished editing the video, which they will soon send to CANDAC's outreach coordinator, Ashley Kilgour, for use during her launch of the CANDAC student researchers program.
Today's ACE ozonesonde flight occurred at 18:15 (local time) and reached an altitude of 31,443 m (6.9 hPa).