Preprints
https://doi.org/10.5194/acp-2022-255
https://doi.org/10.5194/acp-2022-255
 
22 Apr 2022
22 Apr 2022
Status: this preprint has been withdrawn by the authors.

Process-based microphysical characterization of a strong mid-latitude convective system using aircraft in situ cloud measurements

Mireia Papke Chica1,2,7, Valerian Hahn1,2, Tiziana Braeuer1, Elena de la Torre Castro1,2, Florian Ewald1, Mathias Gergely3, Simon Kirschler1,2, Luca Bugliaro Goggia1, Stefanie Knobloch1, Martina Kraemer2,4, Johannes Lucke1,5, Johanna Mayer1, Raphael Maerkl1,2, Manuel Moser1,2, Laura Tomsche1,2, Tina Jurkat-Witschas1, Martin Zoeger6, Christian von Savigny7, and Christiane Voigt1,2 Mireia Papke Chica et al.
  • 1Institute of Atmospheric Physics, German Aerospace Center, DLR, Oberpfaffenhofen, Germany
  • 2Institute of Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
  • 3Deutscher Wetterdienst, Hohenpeissenberg Meteorological Observatory, Hohenpeissenberg, Germany
  • 4Forschungszentrum Jülich GmbH, Jülich, Germany
  • 5Faculty of Aerospace Engineering, Delft University of Technology, Delft, Netherlands
  • 6Institute for Flight Experiments, German Aerospace Center, DLR, Oberpfaffenhofen, Germany
  • 7Institute of Physics, University of Greifswald, Greifswald, Germany

Abstract. Clouds in the mixed-phase temperature regime impose a large uncertainty onto climate prediction models, in part due to incomplete knowledge of the degree of glaciation affecting cloud radiative properties. To achieve a better representation of these clouds, it is crucial to improve the understanding of ice nucleation and growth as well as microphysical properties determining the cloud phase. In this case study, we provide a rare data set of aircraft in situ measurements in a strong mid-latitude convective system extending from the boundary layer to the tropopause and aim to extend the sparse database of such measurements. Data were obtained with the research aircraft HALO and cloud properties were probed with the Cloud and Aerosol Spectrometer (CAS-DPOL) and the Cloud Imaging Probe grayscale (CIPg) during the CIRRUS-HL mission above Southern Germany in July 2021. Microphysical properties of the convective cloud system were measured along a 58-minute stepwise descent between the ground weather stations of Hohenpeissenberg and Munich at temperatures of -35 °C, -23 °C, -13 °C, -7 °C, and -1 °C. A phase identification (liquid/ice) of particles with diameters > 50 μm was achieved using the particle images of the CIPg. Based on recent work, clouds were categorized into four groups with different microphysical properties: Mostly Liquid, Coexistence, Secondary Ice, and Large Ice. High concentrations of large ice crystals were observed in upper layers at temperatures between -35 °C and -13 °C, confirming the importance of the Wegener-Bergeron-Findeisen process for mid-latitude convection. Exceptionally high vertical motions for mid-latitudes of up to +/ 4 ms-1 encountered in the convection promote various freezing and ice growth processes, which in this system led to high ice water contents of up to ~ 1.2 gm-3 and to instrument icing. In contrast, low-level clouds near -1 °C encountered at lower vertical velocities were predominantly composed of liquid droplets and contained precipitated large ice in low concentrations. We find that mechanisms initiating ice nucleation and growth strongly depend on temperature, relative humidity, and vertical velocity and variate within the cloud system. Our measurements represent a unique in-flight data set on microphysical cloud properties of a strong midlatitude convective event and invite for detailed cloud model evaluations and radar intercomparisons with focus on the mixed-phase temperature regime.

This preprint has been withdrawn.

Mireia Papke Chica et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-255', Anonymous Referee #1, 19 Jun 2022
    • CC1: 'Reply on RC1', Valerian Hahn, 05 Aug 2022
      • CC2: 'Reply on CC1', Valerian Hahn, 05 Aug 2022
  • RC2: 'Comment on acp-2022-255', Anonymous Referee #2, 15 Aug 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-255', Anonymous Referee #1, 19 Jun 2022
    • CC1: 'Reply on RC1', Valerian Hahn, 05 Aug 2022
      • CC2: 'Reply on CC1', Valerian Hahn, 05 Aug 2022
  • RC2: 'Comment on acp-2022-255', Anonymous Referee #2, 15 Aug 2022

Mireia Papke Chica et al.

Video supplement

Animation of Hohenpeissenberg radar reflectivity cross sections (C-band) Papke Chica, Mireia; Ewald, Florian; Gergely, Mathias; Voigt, Christiane https://doi.org/10.5281/zenodo.6351715

Mireia Papke Chica et al.

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This preprint has been withdrawn.

Short summary
The mixed-phase temperature regime in convective clouds challenges our understanding of microphysical and radiative cloud properties. We provide a rare and unique dataset of aircraft in situ measurements in a strong mid-latitude convective system. We find that mechanisms initiating ice nucleation and growth strongly depend on temperature, relative humidity, and vertical velocity and variate within the measured system, resulting in altitude dependent changes of the cloud liquid and ice fraction.
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