University of Hertfordshire

From the same journal

From the same journal

By the same authors

Cloud chamber laboratory investigations into scattering properties of hollow ice particles

Research output: Contribution to journalArticlepeer-review

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  • 907010

    Final published version, 2.86 MB, PDF document

  • Helen Smith
  • Paul Connolly
  • Anthony Baran
  • Evelyn Hesse
  • Andrew Smedley
  • Ann Webb
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Original languageEnglish
Pages (from-to)106-118
Number of pages13
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume157
Early online date24 Feb 2015
DOIs
Publication statusPublished - 1 May 2015

Abstract

Measurements are presented of the phase function, P11, and asymmetry parameter, g, of five ice clouds created in a laboratory cloud chamber. At −7 °C, two clouds were created: one comprised entirely of solid columns, and one comprised entirely of hollow columns. Similarly at −15 °C, two clouds were created: one consisting of solid plates and one consisting of hollow plates. At −30 °C, only hollow particles could be created within the constraints of the experiment. The resulting cloud at −30 °C contained short hollow columns and thick hollow plates. During the course of each experiment, the cloud properties were monitored using a Cloud Particle Imager (CPI). In addition to this, ice crystal replicas were created using formvar resin. By examining the replicas under an optical microscope, two different internal structures were identified. The internal and external facets were measured and used to create geometric particle models with realistic internal structures. Theoretical results were calculated using both Ray Tracing (RT) and Ray Tracing with Diffraction on Facets (RTDF). Experimental and theoretical results are compared to assess the impact of internal structure on P11 and g and the applicability of RT and RTDF for hollow columns.

Notes

Copyright 2015 The Authors. Published by Elsevier Ltd.This is an open access article under the CC-BY license (http://creativecommons.org/licenses/by/4.0/). Date of Acceptance: 16/02/2015

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