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

Järvinen, Emma; Schnaiter, M.

doi:10.35097/1602

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

Järvinen, Emma

¹; Schnaiter, M.

¹
¹ Aerosolforschung (IMKAAF), Karlsruher Institut für Technologie (KIT)

Abstract:

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 re-classification of coincidence scattering patterns a machine learning (ML) algorithm was developed.
From the numbers of observed spherical and aspherical 2-D scattering patterns the fractions of spherical and aspherical particles are derived. ... mehr

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Seitenaufrufe: 70
seit 05.07.2023

Zugehörige Institution(en) am KIT	Aerosolforschung (IMKAAF)
Publikationstyp	Forschungsdaten
Publikationsdatum	04.07.2023
Erstellungsdatum	29.06.2023 - 29.06.2023
Identifikator	DOI: 10.35097/1602 KITopen-ID: 1000159945
HGF-Programm	12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Lizenz	Creative Commons Namensnennung 4.0 International
Vorab online veröffentlicht am	29.06.2023
Schlagwörter	Arctic, mixed-phase, clouds, ice crystals, small ice
Liesmich	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 confidence lower limit - Particle size distribution – ice PSD_drop: Particle size distribution – Droplets PSD_drop_upper: Clopper-Pearson confidence upper limit - Particle size distribution – Droplets PSD_drop_lower: Clopper-Pearson confidence lower limit - Particle size distribution – Droplets NDropImag: Number of droplet images used to construct particle size distribution NIceImag: Number of ice images used to construct particle size distribution d_eff_ice: Effective diameter – ice d_eff_drop: Effective diameter – droplets IWC: Ice water content assuming a sphere LWC: Liquid water content LWC_upper: Liquid water content upper limit – sphere. Calculated using Clopper-Pearson confidence lower limit. LWC_lower: Liquid water content lower limit – sphere. Calculated using Clopper-Pearson confidence lower limit. b_ext_drop: Extinction coefficient - droplets b_ext_ice: Extinction coefficient - ice
Art der Forschungsdaten	Dataset

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

Abstract: