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  Impact of particle shape on the morphology of noctilucent clouds

Kiliani, J., Baumgarten, G., Lübken, F.-J., & Berger, U. (2015). Impact of particle shape on the morphology of noctilucent clouds. Atmospheric Chemistry and Physics, 15, 12897-12907. doi:10.5194/acp-15-12897-2015.

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Kiliani, Johannes1, Author           
Baumgarten, G., Author
Lübken, F.-J., Author
Berger, U., Author
Affiliations:
1Observations and Process Studies, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913575              

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 Abstract: Noctilucent clouds (NLCs) occur during summer in the polar region at altitudes around 83 km. They consist of ice particles with a typical size around 50 nm. The shape of NLC particles is less well known but is important both for interpreting optical measurements and modeling ice cloud characteristics. In this paper, NLC modeling of microphysics and optics is adapted to use cylindrical instead of spherical particle shape. The optical properties of the resulting ice clouds are compared directly to NLC three-color measurements by the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) Rayleigh/Mie/Raman (RMR) lidar between 1998 and 2014. Shape distributions including both needle-and disc-shaped particles are consistent with lidar measurements. The best agreement occurs if disc shapes are 60 % more common than needles, with a mean axis ratio of 2.8. Cylindrical particles cause stronger ice clouds on average than spherical shapes with an increase of backscatter at 532 nm by ≈ 30 % and about 20 % in ice mass density. This difference is less pronounced for bright than for weak ice clouds. Cylindrical shapes also cause NLCs to have larger but a smaller number of ice particles than for spherical shapes. © 2015 Author(s).

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Language(s): eng - English
 Dates: 2015-11-19
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.5194/acp-15-12897-2015
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Project name : Role Of the Middle atmosphere In Climate (ROMIC) project Trends In the Middle Atmosphere (TIMA)
Grant ID : 01LG1210A
Funding program : -
Funding organization : Bundesministerium für Bildung und Forschung

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Title: Atmospheric Chemistry and Physics
Source Genre: Journal
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Pages: - Volume / Issue: 15 Sequence Number: - Start / End Page: 12897 - 12907 Identifier: ISSN: 1680-7316