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dc.contributor.authorSmith, Helen
dc.contributor.authorBaran, Anthony
dc.contributor.authorHesse, Evelyn
dc.contributor.authorHill, Peter
dc.contributor.authorConnolly, Paul
dc.contributor.authorWebb, Ann
dc.date.accessioned2017-01-17T17:53:45Z
dc.date.available2017-01-17T17:53:45Z
dc.date.issued2016-11-01
dc.identifier.citationSmith , H , Baran , A , Hesse , E , Hill , P , Connolly , P & Webb , A 2016 , ' Using laboratory and field measurements to constrain a single habit shortwave optical parameterization for cirrus ' , Atmospheric Research , vol. 180 , pp. 226-240 . https://doi.org/10.1016/j.atmosres.2016.05.0005
dc.identifier.issn0169-8095
dc.identifier.otherORCID: /0000-0002-2721-7600/work/62749865
dc.identifier.otherORCID: /0000-0001-8697-4030/work/44742018
dc.identifier.urihttp://hdl.handle.net/2299/17526
dc.description© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.description.abstractA single habit parameterization for the shortwave optical properties of cirrus is presented. The parameterization utilizes a hollow particle geometry, with stepped internal cavities as identified in laboratory and field studies. This particular habit was chosen as both experimental and theoretical results show that the particle exhibits lower asymmetry parameters when compared to solid crystals of the same aspect ratio. The aspect ratio of the particle was varied as a function of maximum dimension, D, in order to adhere to the same physical relationships assumed in the microphysical scheme in a configuration of the Met Office atmosphere-only global model, concerning particle mass, size and effective density. Single scattering properties were then computed using T-Matrix, Ray Tracing with Diffraction on Facets (RTDF) and Ray Tracing (RT) for small, medium, and large size parameters respectively. The scattering properties were integrated over 28 particle size distributions as used in the microphysical scheme. The fits were then parameterized as simple functions of Ice Water Content (IWC) for 6 shortwave bands. The parameterization was implemented into the GA6 configuration of the Met Office Unified Model along with the current operational long-wave parameterization. The GA6 configuration is used to simulate the annual twenty-year short-wave (SW) fluxes at top-of-atmosphere (TOA) and also the temperature and humidity structure of the atmosphere. The parameterization presented here is compared against the current operational model and a more recent habit mixture model.en
dc.format.extent15
dc.format.extent5750319
dc.language.isoeng
dc.relation.ispartofAtmospheric Research
dc.titleUsing laboratory and field measurements to constrain a single habit shortwave optical parameterization for cirrusen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Atmospheric and Climate Physics Research
dc.contributor.institutionLight Scattering and Radiative Processes
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.sciencedirect.com/science/article/pii/S0169809516301120
rioxxterms.versionofrecord10.1016/j.atmosres.2016.05.0005
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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