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PPD-2K Ice Fog Particle Size and Shape Distributions from ALPACA

Schnaiter, Martin ORCID iD icon 1; Järvinen, Emma ORCID iD icon 1; Schmitt, Carl G.; Vas, Dragos
1 Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF), Karlsruher Institut für Technologie (KIT)

Abstract:

This data set contains particle size distributions of spherical and aspherical cloud particles between 7.9 and 107 microns with a 300-second time resolution calculated using the Particle Phase Discriminator Mark. 2 Karlsruhe Edition (PPD-2K). The PPD-2K detects individual cloud particles passing a 532 nm laser beam using two nested trigger detectors. The trigger signal is recorded 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, shape and complexity by a specifically developed image analysis software. More information on the analysis of particle complexity using the k-value can be found in Schnaiter et al., 2016, doi.org/10.5194/acp-16-5091-2016.
From the numbers of observed spherical and aspherical 2-D scattering patterns the fractions of spherical and aspherical particles are derived. Multiplication of those number-based fractions with the total particle size distribution yields phase-specific particle size distribution. ... mehr


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Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF)
Publikationstyp Forschungsdaten
Publikationsdatum 27.02.2024
Erstellungsdatum 28.01.2022 - 03.02.2022
Identifikator DOI: 10.35097/1935
KITopen-ID: 1000168786
HGF-Programm 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Lizenz Creative Commons Namensnennung – Nicht kommerziell 4.0 International
Schlagwörter Ice Fog, Ice Particles, Particle Size Distribution, Particle Habit Distribution, PPD-2K
Liesmich

This netCDF file contains PPD-2K measurements taken during the ALPACA field project. The variables in the file are:

  • Time: seconds after midnight
  • Dp: bin midpoint diameters in microns
  • dNdlogDp: Total particle size distribution normalised with bin width as a function of time and Dp in cm-3
  • N: Total concentration as a function of time in cm-3
  • N_column: Concentration of particles classified as column as a function of time in cm-3 (contains confidence intervals)
  • N_droplets: Concentration of particles classified as spherical as a function of time in cm-3 (contains confidence intervals)
  • N_ice: Concentration of particles classified as aspherical as a function of time in cm-3 (contains confidence intervals)
  • N_plate: Concentration of particles classified as plates as a function of time in cm-3 (contains confidence intervals)
  • N_rough_column: Concentration of particles classified as roughened columns as a function of time in cm-3 (contains confidence intervals)
  • N_rough_plate: Concentration of particles classified as roughened plates as a function of time in cm-3 (contains confidence intervals)
  • Column_fraction: Size segregated fraction of columns as a function of time and Dp
  • Plate_fraction: Size segregated fraction of plates as a function of time and Dp
  • Rough_column_fraction: Size segregated fraction of roughened columns as a function of time and Dp
  • Rough_plate_fraction: Size segregated fraction of roughened plates as a function of time and Dp
  • Kvalue: Median size segregated k-value as a function of time and Dp
  • Variance: Median size segregated variance as a function of time and Dp
    See more information on the data products from Vochezer et al. (2016), doi:10.5194/amt-9-159-2016, and Schnaiter et al., 2016, doi.org/10.5194/acp-16-5091-2016.
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