SID-3 Liquid and Ice Phase Particle Size Distributions measured during ACLOUD ...

• Main Authors: Järvinen, Emma, Schnaiter, M.
• Format: Dataset
• Language: unknown
• Published: Karlsruhe Institute of Technology 2023
• Subjects: Geological Science; Arctic; mixed-phase; clouds; ice crystals; small ice
• Online Access: https://dx.doi.org/10.35097/1602; https://radar.kit.edu/radar/en/dataset/NGXXNmRCpxAkydeL

This data set contains particle size distributions of spherical and aspherical cloud particles between 5 and 45 microns with a 10-second time resolution calculated from the Small Ice Detector Mark 3 (SID-3). The SID-3 detects individual cloud particles passing a 532 nm laser beam using two nested trigger detectors. The trigger signal is recorded as a histogram with a maximum rate of 11 kHz that can be used to derive particle size distributions by using the procedure described in Vochezer et al. (2016), doi:10.5194/amt-9-159-2016. For a sub-set of triggered particles a two-dimensional (2-D) scattering pattern is recorded that can be analysed for particle sphericity by a specifically developed image analysis software. Occasionally, coincidence sampling in the camera field of view causes optical distortions of the 2-D scattering patterns of liquid droplets and, consequently, a misclassification of such scattering patterns to be aspherical by the classification software. For the subsequent identification and ... : The data is in a NetCDF format. The file contains the following variables: time_sec_af_midn: time as seconds after midnight T: temperature in degree Celsius altitude: flight altitude bin_midpoints: bin midpoint diameters in µm - droplets bin_ice_midpoints: bin midpoint diameters in µm - ice bin_endpoints: bin endpoint diameters in µm - droplets bin_ice_endpoints: bin endpoint diameters in µm - ice Ntot_drop: Total concentration in particles per cubic centimeter – droplets dNtot_drop_upper: Clopper-Pearson confidence upper limit – droplets dNtot_drop_lower: Clopper-Pearson confidence lower limit – droplets Ntot_ice: Total concentration in particles per cubic centimeter – ice dNtot_ice_upper: Clopper-Pearson confidence upper limit – ice dNtot_ice_lower: Clopper-Pearson confidence lower limit – ice PSD_all: Particle size distribution – ALL particles PSD_ice: Particle size distribution – ice PSD_ice_upper: Clopper-Pearson confidence upper limit - Particle size distribution – ice PSD_ice_lower: Clopper-Pearson ...