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Browsing by Author "Hirst, Edwin"
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AIITS: Preliminary light scattering data from Tropical Tropopause Layer cirrus
Stopford, Chris; Kaye, Paul H.; Ulanowski, Joseph; Hirst, Edwin; Greenaway, Richard; Dorsey, James; Gallagher, Martin; Woods, Sarah; Lawson, Paul; Thornberry, Troy; Rollins, Drew; Harris, Neil (2015-07-22)The new optical particle spectrometer AIITS (Aerosol Ice Interface Transition Spectrometer) is the next instrument in the Small Ice Detector (SID) family. Like SID3, it acquires two-dimensional forward scattering patterns ... -
Apparatus and Method for the Analysis of Particle Characteristics using Monotonically Scattered light.
Particle Instruments and diagnostics; Kaye, Paul; Hirst, Edwin (1995-11-28) -
Atmospheric dust charging, vertical profiles, and optical properties measured in the Arabian Peninsula during the DREAME campaign
Ulanowski, Joseph; Sabbah, Ismail; Harrison, R.G.; Nicoll, K.A.; Hirst, Edwin; Kaye, Paul H.; Al-Abbadi, Naif; Rogers, George (2010)Polarimetric observations of atmospheric Saharan dust over the Canary Islands have provided strong evidence for the presence of vertically aligned particles. The alignment was thought to be due to the electric field present ... -
The characterisation of airborne particles by analysis of spatial light scattering profiles
Kaye, Paul H.; Hirst, Edwin; Micheli, F. (1992)An instrument has been developed to investigate the potential characterisation of airborne particles, with particular reference to shape and size, by analysis of the spatial intensity distribution of scattered light. In ... -
Characterising atmospheric cloud particles using spatial light scattering
Hirst, Edwin; Kaye, Paul H.; Saunders, S.; Johnson, D.W.; Pickering, M.A. (1998)To be able to understand the radiative transfer properties of ice and mixed phase (ice and water) clouds, a detailed knowledge of the cloud particles' shapes and sizes is required, along with measurements of the number ... -
Characterising droplet behaviour in an aerodynamic particle sizer by means of spatial light scattering
Secker, D.R.; Hirst, Edwin; Kaye, Paul H. (1998)This paper describes the progress of a research project aimed at optically characterising the degree of deformation suffered by liquid droplets within the TSI Aerodynamic Particle Sizer APS3320 with a view to providing a ... -
Characterization of small ice crystals using frequency analysis of azimuthal scattering patterns
Ulanowski, Zbigniew; Stopford, Chris; Hesse, Evelyn; Kaye, Paul H.; Hirst, Edwin; Schnaiter, M. (2007)Azimuthal scattering patterns obtained from ice crystals using the Small Ice Detector 2 are examined. They are converted to frequency spectra using Fast Fourier Transform. To classify the shape of the crystals, the spectra ... -
Classifying atmospheric ice crystals by spatial light scattering
Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Ulanowski, Zbigniew; Hesse, Evelyn; DeMott, P.; Saunders, C.; Connolly, P. (2008)We describe preliminary results from an optical scattering instrument designed to assess the shapes and sizes of microscopic atmospheric cloud particles, especially the smallest ice crystals, that can profoundly affect ... -
Cloud characterization using a particle-counter dropsonde
Ulanowski, Zbigniew; Kaye, Paul; Hirst, Edwin; Wieser, Andreas; Stanley, Warren (2015-04-12)Routine meteorological data is obtained in the atmosphere using disposable radiosondes, giving temperature, pressure, humidity and wind speed. Additional measurements are obtained from dropsondes, released from research ... -
Detection of Hazardous Airborne Fibres
Particle Instruments and diagnostics; Kaye, Paul H.; Hirst, Edwin (2003-08-12) -
Detection of Hazardous Airborne Fibres
Particle Instruments and diagnostics; Kaye, Paul H.; Hirst, Edwin (2003-06-18) -
Dust layer profiling using an aerosol dropsonde
Ulanowski, Z.; Kaye, Paul H.; Hirst, Edwin; Wieser, Andreas; Stanley, Warren (2015-04-12)Routine meteorological data is obtained in the atmosphere using disposable radiosondes, giving temperature, pressure, humidity and wind speed. Additional measurements are obtained from dropsondes, released from research ... -
The effective density of small ice particles obtained from in situ aircraft observations of mid-latitude cirrus
Cotton, Richard; Field, P.R.; Ulanowski, Joseph; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Crawford, I.A.; Crosier, J.; Dorsey, James (2013-10)The effective ice-particle density, parametrized through a mass–dimension relation, is widely used in ice microphysical schemes for weather and climate models. In this study, we use aircraft-based observations in mid-latitude ... -
Exploring the surface roughness of small ice crystals by measuring high resolution angular scattering patterns.
Schnaiter, M.; Kaye, Paul H.; Hirst, Edwin; Ulanowski, Zbigniew; Wagner, Robert (2011)Surface roughness of atmospheric ice particles is an important yet poorly investigated microphysical property in the context of the climate impact of cirrus and mixed-phase clouds. Measurements of single particle two-dimensional ... -
Fluid-borne Particle Analysers
Centre for Atmospheric and Climate Physics Research; Particle Instruments and diagnostics; Kaye, Paul H.; Hirst, Edwin (2008-10-14)This invention describes an improved method and apparatus for the analysis of fluid borne particles and which is especially suitable for the detection of airborne biological particles. In one aspect of the invention provides ... -
Ice nucleation in orographic wave clouds : measurements made during INTACC
Field, P.R.; Cotton, R.; Noone, K.; Glantz, P.; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard (2001) -
Ice particle inter-arrival times measured with a fast FSSP
Field, P.R.; Wood, R.; Brown, P.R.A.; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Smith, J.A. (2003)Ice particle interarrival times have been measured with a fast forward scattering spectrometer probe (FSSP). The distribution of interarrival times is bimodal instead of the exponential distribution expected for a Poisson ... -
An improved low cost apparatus and method for the detection of a fluid-borne particle
School of Physics, Astronomy and Mathematics; Science & Technology Research Institute; Centre for Atmospheric and Climate Physics Research; Particle Instruments and diagnostics; Kaye, Paul H.; Hirst, Edwin (2012-05-03)An apparatus for the detection of a fluid-borne particle (10) in an optically defined particle sensing zone, the apparatus comprising: i) a scattering chamber (40); ii) a means for providing a sample of fluid (34), containing ... -
An improved low-cost apparatus and method for the detection of a fluid-borne particle
School of Physics, Astronomy and Mathematics; Science & Technology Research Institute; Centre for Atmospheric and Climate Physics Research; Particle Instruments and diagnostics; Kaye, Paul H.; Hirst, Edwin (2012-05-02) -
Incidence of rough and irregular atmospheric ice particles from Small Ice Detector 3 measurements
Ulanowski, Joseph; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Cotton, Richard J.; Hesse, Evelyn; Collier, Christopher T. (2014-02-12)The 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 ...