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The Cloud Particle Spectrometer with Polarization Detection (CPSPD)

The Cloud Particle Spectrometer with Polarization Detection (CPSPD) A Next Generation Cloud Probe For Cloud Droplet and Ice Crystal Discrimination Darrel Baumgardner Centro de Ciencias de la Atmosfera, UNAM, Mexico Roy Newton and Gary Granger Droplet Measurement Technologies

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The Cloud Particle Spectrometer with Polarization Detection (CPSPD)

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  1. The Cloud Particle Spectrometer with Polarization Detection (CPSPD) A Next Generation Cloud Probe For Cloud Droplet and Ice Crystal Discrimination Darrel Baumgardner Centro de Ciencias de la Atmosfera, UNAM, Mexico Roy Newton and Gary Granger Droplet Measurement Technologies 16th International Conference on Clouds and Precipitation Leipzig, Germany July 30-August 3, 2012

  2. Presentation Guide • Motivation • Background • Measurement Technique • Measurement Example • Summary and Outlook

  3. Motivation February, 2012 Bulletin of the American Meteorological Society

  4. The Small Ice Detector (SID) – Can it Detect Frozen Water Droplets or Stacked Disordered Ice? Supercooled AltoCu Mixed-Phase StratoCu Cotton, R., et al., 2009. The ability of the small ice detector (SID-2) to characterize cloud particle and aerosol morphologies obtained during flights of the FAAM BAe-146 research aircraft. J. Atmos. Ocean. Tech. 27, 290-303.

  5. … Or the SID-2H? Kaye , P., et al.: . Classifying atmospheric ice crystals by spatial light scattering, Vol. 33, No. 13 / Optics Letters, 1545-1547, 2008

  6. Single Particle Polarization Detection

  7. Background • Fukuta, N. and Kramer, G. K. : A fast activation continuous ice nuclei counter, J. Rech. Atmos., 3, 169–173, 1968. • Turner, F.M. and Radke L.F. : The design and evaluation of an airborne optical ice particle counter, JAM, 12, 1309-1318, 1973. • Hobbs, R. and Cooper, W.A.: Field evidence supporting quantitative predictions of secondary ice production, J. Atmos. Sci, 44, 1987. • Bundke, U. et al.: The Fast Ice Nucleus chamber FINCH, Atmos. Res., 90, 180–186, 2008. • Nicolet, M. et al. : Circular depolarization ratios of single water droplets and finite ice circular cylinders: a modeling study, ACP, 12, 4207-4214, 2012 (Special Issue on Light Polarization by Particles) • Glen, A. and Brooks, S.: A New Method for Measuring Optical Scattering Properties of Atmospherically Relevant Dusts using the Cloud Aerosol Spectrometer Polarization (CASPOL) Instrument, ACPD, 2012, (Special Issue on Light Polarization by Particles)

  8. Note: Orientation Sensitive!

  9. Measurement Technique

  10. Cloud Aerosol Spectrometer with Polarization (CAS-POL) Optical Path Optical Diameter Range 0.5-50 m

  11. Measurements with the CAS-POL distinguish droplets from crystals (courtesy James Dorsey, U. Manchester) S to Total Polarization S-Polarization to Forward Measurements taken over the North Atlantic on the BAE-146

  12. Potential for Shattering

  13. The Cloud Particle Spectrometer with Polarization Detection (CPSPD) Optical Diameter Range 0.5-50 m Probe tips follow Korolev patented design (licensed by DMT)

  14. Measurement Examples

  15. Maiden Voyage on the North Dakota Citation

  16. November 6, 2011

  17. Size Distributions of S-Polarization to Forward Scattering

  18. Mixed Phase? All Ice All Water

  19. Summary and Outlook • Measurements of polarized light scattered by single particles provide information on morphology (droplets, ice, dust, ash). • Studies are underway to quantify the relationship between particle morphology and the change in the polarization state of the scattered light (9:45 – Meyer et al. “Cloud particle detection in AIDA and Natural Mixed Phase Clouds”) • The CPSPD will make measurements this fall on the Zugspitze, Germany.

  20. Acknowledgements • Mike Poellot and David Delene • University of North Dakota • For aircraft flight support • Bill Dawson • Droplet Measurement Technologies • For calibration and maintenance of the CPSPD • Alexei Korolev • Environment Canada • Probe tip design • Armin Afchine • ForschungszentrumJülich • Airflow Modeling • Kaare Anderson • Goodrich Corporation • For flight hour donation

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