University of Hertfordshire

Documents

  • Ahmed Abdelmotaleb
  • Emma Järvinen
  • D Duft
  • Edwin Hirst
  • Steffen Vogt
  • T. Leisner
  • Martin Schnaiter
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Original languageEnglish
Pages3131-3144
Number of pages14
Volume9
Issue number7
JournalAtmospheric Measurement Techniques
PublisherCopernicus GmbH
DOIs
Publication statusPublished - 20 Jul 2016

Abstract

The number and shape of ice crystals present in mixed-phase and ice clouds influence the radiation properties, precipitation occurrence and lifetime of these clouds. Since clouds play a major role in the climate system, influencing the energy budget by scattering sunlight and absorbing heat radiation from the earth, it is necessary to investigate the optical and microphysical properties of cloud particles particularly in situ. The relationship between the microphysics and the single scattering properties of cloud particles is usually obtained by modelling the optical scattering properties from in situ measurements of ice crystal size distributions. The measured size distribution and the assumed particle shape might be erroneous in case of non-spherical ice particles. There is a demand to obtain both information correspondently and simultaneously for individual cloud particles in their natural environment. For evaluating the average scattering phase function as a function of ice particle habit and crystal complexity, in situ measurements are required. To this end we have developed a novel airborne optical sensor (PHIPS-HALO) to measure the optical properties and the corresponding microphysical parameters of individual cloud particles simultaneously. PHIPS-HALO has been tested in the AIDA cloud simulation chamber and deployed in mountain stations as well as research aircraft (HALO and Polar 6). It is a successive version of the laboratory prototype instrument PHIPS-AIDA. In this paper we present the detailed design of PHIPS-HALO, including the detection mechanism, optical design, mechanical construction and aerodynamic characterization.

Notes

This is an Open Access article distributed under the terms ofthe Creative Commons Attribution 3.0 License https://creativecommons.org/licenses/by/3.0/

ID: 10458056