Direct observations of small atmospheric ice crystals (< 100 µm) on the Antarctic Plateau are scarce. However, they are commonly found in this region, which frequently experiences cirrus-level temperatures, even during the warmest part of the year. During the austral summer of 2023/2024, the Particle Phase Discriminator (PPD-2K) was deployed at DOME-C, Antarctica. This instrument was used to investigate the microphysical and optical characteristics of individual boundary layer ice particles with spherical equivalent diameters ranging from 11 to 150 µm. Measurements included particle concentration, size distribution, and forward light scattering patterns, which provide insights into particle sphericity (phase), shape, and structural complexity. Tropospheric depolarisation lidar data and temperature and humidity data from a 42 m measurement tower are used to analyse the atmospheric conditions. 

Measurement data recorded during the austral summer of 2023/2024 at Concordia Station, Dome C, Antarctica, (75°S, 123°E) of 1) In situ data from the PPD-2K instrument providing particle concentration, size distribution and information of the particle sphericity (particle phase), shape and crystal complexity from images of the forward direction diffraction patterns recorded at ground level (Dome C PPD-2K.rar). This is updated version 2. 2) Automatic depolarization LIDAR data including height, backscattering signal and linear depolarisation ratio between 20 m and 7000 m (lidar data.rar). 3) Temperature and humidity measurements taken at heights of 3 m, 18 m and 42 m above ground level on the measurement tower at Dome C, Antarctica (temperature_humidity.rar). Version 3: Pollution flagging is now improved.