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  Small ice particles at slightly supercooled temperatures in tropical maritime convection

Lloyd, G., Choularton, T., Bower, K., Crosier, J., Gallagher, M., Flynn, M., et al. (2020). Small ice particles at slightly supercooled temperatures in tropical maritime convection. Atmospheric Chemistry and Physics, 20, 3895-3904. doi:10.5194/acp-20-3895-2020.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-AC81-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-AC82-5
Genre: Journal Article

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Lloyd, G., Author
Choularton, T., Author
Bower, K., Author
Crosier, J., Author
Gallagher, M., Author
Flynn, M., Author
Dorsey, J., Author
Liu, D., Author
Taylor, J. W., Author
Schlenczek, O.1, Author              
Fugal, J., Author
Borrmann, S., Author
Cotton, R., Author
Field, P., Author
Blyth, A., Author
Affiliations:
1Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063287              

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 Abstract: In this paper we show that the origin of the ice phase in tropical cumulus clouds over the sea may occur by primary ice nucleation of small crystals at temperatures just between 0 and − 5 ‭⁰C. This was made possible through use of a holographic instrument able to image cloud particles at very high resolution and small size (6 μm). The environment in which the observations were conducted was notable for the presence of desert dust advected over the ocean from the Sahara. However, there is no laboratory evidence to suggest that these dust particles can act as ice nuclei at temperatures warmer than about −10 ‭⁰C, the zone in which the first ice was observed in these clouds. The small ice particles were observed to grow rapidly by vapour diffusion, riming, and possibly through collisions with supercooled raindrops, causing these to freeze and potentially shatter. This in turn leads to the further production of secondary ice in these clouds. Hence, although the numbers of primary ice particles are small, they are very effective in initiating the rapid glaciation of the cloud, altering the dynamics and precipitation production processes.

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Language(s): eng - English
 Dates: 2020-03-31
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.5194/acp-20-3895-2020
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Title: Atmospheric Chemistry and Physics
Source Genre: Journal
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Pages: 10 Volume / Issue: 20 Sequence Number: - Start / End Page: 3895 - 3904 Identifier: -