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Quasi-spherical ice in convective clouds

Research output: Contribution to journalArticlepeer-review

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Quasi-spherical ice in convective clouds. / Järvinen, Emma; Schnaiter, Martin; Mioche, Guillaume; Jourdan, Olivier; Shcherbakov, Valery N.; Costa, Anja; Afchine, Armin; Krämer, Martina; Heidelberg, Fabian; Jurkat, Tina; Voigt, Christiane; Schlager, Hans; Nichman, Leonid; Gallagher, Martin; Hirst, Edwin; Schmitt, Carl; Bansemer, Aaron; Heymsfield, Andy; Lawson, Paul; Tricoli, Ugo; Pfeilsticker, Klaus; Vochezer, Paul; Möhler, Ottmar; Leisner, Thomas.

In: Journal of the Atmospheric Sciences, Vol. 73, No. 10, 21.09.2016, p. 3885-3910.

Research output: Contribution to journalArticlepeer-review

Harvard

Järvinen, E, Schnaiter, M, Mioche, G, Jourdan, O, Shcherbakov, VN, Costa, A, Afchine, A, Krämer, M, Heidelberg, F, Jurkat, T, Voigt, C, Schlager, H, Nichman, L, Gallagher, M, Hirst, E, Schmitt, C, Bansemer, A, Heymsfield, A, Lawson, P, Tricoli, U, Pfeilsticker, K, Vochezer, P, Möhler, O & Leisner, T 2016, 'Quasi-spherical ice in convective clouds', Journal of the Atmospheric Sciences, vol. 73, no. 10, pp. 3885-3910. https://doi.org/10.1175/JAS-D-15-0365.1

APA

Järvinen, E., Schnaiter, M., Mioche, G., Jourdan, O., Shcherbakov, V. N., Costa, A., Afchine, A., Krämer, M., Heidelberg, F., Jurkat, T., Voigt, C., Schlager, H., Nichman, L., Gallagher, M., Hirst, E., Schmitt, C., Bansemer, A., Heymsfield, A., Lawson, P., ... Leisner, T. (2016). Quasi-spherical ice in convective clouds. Journal of the Atmospheric Sciences, 73(10), 3885-3910. https://doi.org/10.1175/JAS-D-15-0365.1

Vancouver

Järvinen E, Schnaiter M, Mioche G, Jourdan O, Shcherbakov VN, Costa A et al. Quasi-spherical ice in convective clouds. Journal of the Atmospheric Sciences. 2016 Sep 21;73(10):3885-3910. https://doi.org/10.1175/JAS-D-15-0365.1

Author

Järvinen, Emma ; Schnaiter, Martin ; Mioche, Guillaume ; Jourdan, Olivier ; Shcherbakov, Valery N. ; Costa, Anja ; Afchine, Armin ; Krämer, Martina ; Heidelberg, Fabian ; Jurkat, Tina ; Voigt, Christiane ; Schlager, Hans ; Nichman, Leonid ; Gallagher, Martin ; Hirst, Edwin ; Schmitt, Carl ; Bansemer, Aaron ; Heymsfield, Andy ; Lawson, Paul ; Tricoli, Ugo ; Pfeilsticker, Klaus ; Vochezer, Paul ; Möhler, Ottmar ; Leisner, Thomas. / Quasi-spherical ice in convective clouds. In: Journal of the Atmospheric Sciences. 2016 ; Vol. 73, No. 10. pp. 3885-3910.

Bibtex

@article{811670667603403da712f11cca6f9a01,
title = "Quasi-spherical ice in convective clouds",
abstract = "Homogeneous freezing of supercooled droplets occurs in convective systems in low and midlatitudes. This droplet-freezing process leads to the formation of a large amount of small ice particles, so-called frozen droplets, that are transported to the upper parts of anvil outflows, where they can influence the cloud radiative properties. However, the detailed microphysics and, thus, the scattering properties of these small ice particles are highly uncertain. Here, the link between the microphysical and optical properties of frozen droplets is investigated in cloud chamber experiments, where the frozen droplets were formed, grown, and sublimated under controlled conditions. It was found that frozen droplets developed a high degree of small-scale complexity after their initial formation and subsequent growth. During sublimation, the small-scale complexity disappeared, releasing a smooth and near-spherical ice particle. Angular light scattering and depolarization measurements confirmed that these sublimating frozen droplets scattered light similar to spherical particles: that is, they had angular light-scattering properties similar to water droplets. The knowledge gained from this laboratory study was applied to two case studies of aircraft measurements in midlatitude and tropical convective systems. The in situ aircraft measurements confirmed that the microphysics of frozen droplets is dependent on the humidity conditions they are exposed to (growth or sublimation). The existence of optically spherical frozen droplets can be important for the radiative properties of detraining convective outflows.",
keywords = "Cirrus clouds, Cloud microphysics, Ice crystals, Optical properties, Sublimation",
author = "Emma J{\"a}rvinen and Martin Schnaiter and Guillaume Mioche and Olivier Jourdan and Shcherbakov, {Valery N.} and Anja Costa and Armin Afchine and Martina Kr{\"a}mer and Fabian Heidelberg and Tina Jurkat and Christiane Voigt and Hans Schlager and Leonid Nichman and Martin Gallagher and Edwin Hirst and Carl Schmitt and Aaron Bansemer and Andy Heymsfield and Paul Lawson and Ugo Tricoli and Klaus Pfeilsticker and Paul Vochezer and Ottmar M{\"o}hler and Thomas Leisner",
year = "2016",
month = sep,
day = "21",
doi = "10.1175/JAS-D-15-0365.1",
language = "English",
volume = "73",
pages = "3885--3910",
journal = "Journal of the Atmospheric Sciences",
issn = "0022-4928",
publisher = "American Meteorological Society",
number = "10",

}

RIS

TY - JOUR

T1 - Quasi-spherical ice in convective clouds

AU - Järvinen, Emma

AU - Schnaiter, Martin

AU - Mioche, Guillaume

AU - Jourdan, Olivier

AU - Shcherbakov, Valery N.

AU - Costa, Anja

AU - Afchine, Armin

AU - Krämer, Martina

AU - Heidelberg, Fabian

AU - Jurkat, Tina

AU - Voigt, Christiane

AU - Schlager, Hans

AU - Nichman, Leonid

AU - Gallagher, Martin

AU - Hirst, Edwin

AU - Schmitt, Carl

AU - Bansemer, Aaron

AU - Heymsfield, Andy

AU - Lawson, Paul

AU - Tricoli, Ugo

AU - Pfeilsticker, Klaus

AU - Vochezer, Paul

AU - Möhler, Ottmar

AU - Leisner, Thomas

PY - 2016/9/21

Y1 - 2016/9/21

N2 - Homogeneous freezing of supercooled droplets occurs in convective systems in low and midlatitudes. This droplet-freezing process leads to the formation of a large amount of small ice particles, so-called frozen droplets, that are transported to the upper parts of anvil outflows, where they can influence the cloud radiative properties. However, the detailed microphysics and, thus, the scattering properties of these small ice particles are highly uncertain. Here, the link between the microphysical and optical properties of frozen droplets is investigated in cloud chamber experiments, where the frozen droplets were formed, grown, and sublimated under controlled conditions. It was found that frozen droplets developed a high degree of small-scale complexity after their initial formation and subsequent growth. During sublimation, the small-scale complexity disappeared, releasing a smooth and near-spherical ice particle. Angular light scattering and depolarization measurements confirmed that these sublimating frozen droplets scattered light similar to spherical particles: that is, they had angular light-scattering properties similar to water droplets. The knowledge gained from this laboratory study was applied to two case studies of aircraft measurements in midlatitude and tropical convective systems. The in situ aircraft measurements confirmed that the microphysics of frozen droplets is dependent on the humidity conditions they are exposed to (growth or sublimation). The existence of optically spherical frozen droplets can be important for the radiative properties of detraining convective outflows.

AB - Homogeneous freezing of supercooled droplets occurs in convective systems in low and midlatitudes. This droplet-freezing process leads to the formation of a large amount of small ice particles, so-called frozen droplets, that are transported to the upper parts of anvil outflows, where they can influence the cloud radiative properties. However, the detailed microphysics and, thus, the scattering properties of these small ice particles are highly uncertain. Here, the link between the microphysical and optical properties of frozen droplets is investigated in cloud chamber experiments, where the frozen droplets were formed, grown, and sublimated under controlled conditions. It was found that frozen droplets developed a high degree of small-scale complexity after their initial formation and subsequent growth. During sublimation, the small-scale complexity disappeared, releasing a smooth and near-spherical ice particle. Angular light scattering and depolarization measurements confirmed that these sublimating frozen droplets scattered light similar to spherical particles: that is, they had angular light-scattering properties similar to water droplets. The knowledge gained from this laboratory study was applied to two case studies of aircraft measurements in midlatitude and tropical convective systems. The in situ aircraft measurements confirmed that the microphysics of frozen droplets is dependent on the humidity conditions they are exposed to (growth or sublimation). The existence of optically spherical frozen droplets can be important for the radiative properties of detraining convective outflows.

KW - Cirrus clouds

KW - Cloud microphysics

KW - Ice crystals

KW - Optical properties

KW - Sublimation

UR - http://www.scopus.com/inward/record.url?scp=84994193497&partnerID=8YFLogxK

U2 - 10.1175/JAS-D-15-0365.1

DO - 10.1175/JAS-D-15-0365.1

M3 - Article

AN - SCOPUS:84994193497

VL - 73

SP - 3885

EP - 3910

JO - Journal of the Atmospheric Sciences

JF - Journal of the Atmospheric Sciences

SN - 0022-4928

IS - 10

ER -