During the South Pole Atmospheric Radiation and Cloud Lidar Experiment (SPARCLE), in situ measurements were made in a supercooled liquid cloud at ~240 K. In situ measurements were made from a tethered balloon, including a Vaisala RS-80 radiosonde with sensors for pressure, temperature, altitude, and relative humidity, as well as a hydrometeor videosonde (HYVIS), which captured images of hydrometeors in the cloud. At the same time, continuous downwelling radiance measurements were made with the Polar Atmospheric Emitted Radiance Interferometer (PAERI). The HYVIS images were used to characterize the cloud droplet radius distribution in the cloud.

The South Pole MPL data is available here: https://mplnet.gsfc.nasa.gov/data?s=South_Pole&v=V2&product=L1_NRB&focus=v