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dc.contributor.authorUlanowski, Joseph
dc.contributor.authorKaye, Paul H.
dc.contributor.authorHirst, Edwin
dc.contributor.authorGreenaway, Richard
dc.contributor.authorCotton, Richard J.
dc.contributor.authorHesse, Evelyn
dc.contributor.authorCollier, Christopher T.
dc.date.accessioned2014-02-13T10:58:54Z
dc.date.available2014-02-13T10:58:54Z
dc.date.issued2014-02-12
dc.identifier.citationUlanowski , J , Kaye , P H , Hirst , E , Greenaway , R , Cotton , R J , Hesse , E & Collier , C T 2014 , ' Incidence of rough and irregular atmospheric ice particles from Small Ice Detector 3 measurements ' , Atmospheric Chemistry and Physics , vol. 14 , pp. 1649–1662 . https://doi.org/10.5194/acp-14-1649-2014
dc.identifier.issn1680-7316
dc.identifier.otherPURE: 2763488
dc.identifier.otherPURE UUID: 948019fc-f05f-4f39-9c72-342a27c8d2ec
dc.identifier.otherScopus: 84894088628
dc.identifier.otherORCID: /0000-0003-4761-6980/work/32374617
dc.identifier.otherORCID: /0000-0001-6950-4870/work/32371974
dc.identifier.otherORCID: /0000-0002-2721-7600/work/62749850
dc.identifier.otherORCID: /0000-0002-0073-8684/work/69424251
dc.identifier.urihttp://hdl.handle.net/2299/12820
dc.description© Author(s) 2014. This work is distributed under the Creative Commons Attribution 3.0 License
dc.description.abstractThe knowledge of properties of ice crystals such as size, shape, concavity and roughness is critical in the context of radiative properties of ice and mixed-phase clouds. Limitations of current cloud probes to measure these properties can be circumvented by acquiring two-dimensional lightscattering patterns instead of particle images. Such patterns were obtained in situ for the first time using the Small Ice Detector 3 (SID-3) probe during several flights in a variety of mid-latitude mixed-phase and cirrus clouds. The patterns are analysed using several measures of pattern texture, selected to reveal the magnitude of particle roughness or complexity. The retrieved roughness is compared to values obtained from a range of well-characterized test particles in the laboratory. It is found that typical in situ roughness corresponds to that found in the rougher subset of the test particles, and sometimes even extends beyond the most extreme values found in the laboratory. In this study we do not differentiate between small-scale, fine surface roughness and large-scale crystal complexity. Instead, we argue that both can have similar manifestations in terms of light-scattering properties and also similar causes. Overall, the in situ data are consistent, with ice particles with highly irregular or rough surfaces being dominant. Similar magnitudes of roughness were found in growth and sublimation zones of cirrus. The roughness was found to be negatively correlated with the halo ratio, but not with other thermodynamic or microphysical properties found in situ. Slightly higher roughness was observed in cirrus forming in clean oceanic air masses than in a continental, polluted one. Overall, the roughness and complexity are expected to lead to increased shortwave cloud reflectivity, in comparison with cirrus composed of more regular, smooth ice crystal shapes. These findings put into question suggestions that climate could be modified through aerosol seeding to reduce cirrus cover and optical depth, as the seeding may result in decreased shortwave reflectivityen
dc.language.isoeng
dc.relation.ispartofAtmospheric Chemistry and Physics
dc.titleIncidence of rough and irregular atmospheric ice particles from Small Ice Detector 3 measurementsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Atmospheric and Climate Physics Research
dc.contributor.institutionLight Scattering and Radiative Processes
dc.contributor.institutionParticle Instruments and diagnostics
dc.description.statusPeer reviewed
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.5194/acp-14-1649-2014
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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