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Supplementary data for J. Kleinheins et al. "Thermal imaging of freezing drizzle droplets: pressure release events as a source of secondary ice particles", Journal of the Atmospheric Sciences 2021

Kleinheins, Judith; Kiselev, Alexei; Keinert, Alice; Leisner, Thomas

Abstract (englisch):
The freezing process of a supercooled water droplet freely falling through air is a remarkably dynamic and eventful process. During freezing from the outside in, the volume increase of liquid water upon solidification leads to a pressure rise inside the droplet. The pressure is released in various ways, e.g. by cracking or by complete fragmentation of the ice shell. These processes may be the source of secondary ice particles that are emitted during droplet freezing. In this study, the surface temperature of freezing drizzle-sized water droplets was measured with a high-resolution infrared thermography system, while recording the changes in shape and structure of the droplet by a high-speed video camera. The droplets were levitated in an electrodynamic trap under controlled conditions with respect to temperature, humidity and airflow velocity. Measurement of the surface temperature during freezing allowed for determination of the absolute pressure inside the liquid core. During the freezing of a droplet the pressure rise is interrupted many times by rapid pressure release events, each being a possible source of secondary ice. Pressure release events were three times more frequent for droplets freezing under free-fall conditions compared to droplets freezing in stagnant air. ... mehr

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Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Institut für Thermische Verfahrenstechnik (TVT)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Forschungsdaten
Publikationsdatum 24.03.2021
Erstellungsdatum 14.01.2020 - 08.02.2021
Identifikator DOI (KIT): 10.5445/IR/1000129595
KITopen-ID: 1000129595
Weitere HGF-Programme 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Lizenz Creative Commons Namensnennung 4.0 International
Schlagwörter cloud physics, secondary ice, thermal imaging, high-speed video

Numerical data for all the figures in the related paper. The format of the .csv files is described within the .csv-files. The format for the .json-file is described in a separate text file "comment_on_data_figure_6_all_json_file.txt". The videos are described in "Video captions IR Paper.pdf"

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