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000017426 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000017426 1001_ $$0P:(DE-HGF)0$$aAbdelmonem, A.$$b0
000017426 245__ $$aFirst correlated measurements of the shape and light scattering properties of cloud particles using the new Particle Habit Imaging and Polar Scattering (PHIPS) probe
000017426 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2011
000017426 300__ $$a2125 - 2142
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000017426 440_0 $$020401$$aAtmospheric Measurement Techniques$$v4$$x1867-1381
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000017426 500__ $$aWe express our gratitude to the technical and scientific staff of IMK-AAF for their continuous support until the achievement of the presented work goals. The work of one of the authors (Evelyn Hesse) was a result of the cooperation with Zbigniew Ulanowski and supported by the National Environment Research Council, UK. This work was funded within the Helmholtz Research Program Atmosphere and Climate and partly by the German Research Foundation (DFG contract SCHN 1140/1-1) within the framework of the priority program 1294. We acknowledge support by Deutsche Forschungsgemeinschaft and Open Access Publishing Fund of Karlsruhe Institute of Technology.
000017426 520__ $$aStudying the radiative impact of cirrus clouds requires knowledge of the relationship between their microphysics and the single scattering properties of cloud particles. Usually, this relationship is obtained by modeling 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. We present here a novel optical sensor (the Particle Habit Imaging and Polar Scattering probe, PHIPS) designed to measure simultaneously the 3-D morphology and the corresponding optical and microphysical parameters of individual cloud particles. Clouds containing particles ranging from a few micrometers to about 800 mu m diameter in size can be characterized systematically with an optical resolution power of 2 mu m and polar scattering resolution of 1 degrees for forward scattering directions (from 1 degrees to 10 degrees) and 8 degrees for side and backscattering directions (from 18 degrees to 170 degrees). The maximum acquisition rates for scattering phase functions and images are 262 KHz and 10 Hz, respectively. Some preliminary results collected in two ice cloud campaigns conducted in the AIDA cloud simulation chamber are presented. PHIPS showed reliability in operation and produced size distributions and images comparable to those given by other certified cloud particles instruments. A 3-D model of a hexagonal ice plate is constructed and the corresponding scattering phase function is compared to that modeled using the Ray Tracing with Diffraction on Facets (RTDF) program. PHIPS is a highly promising novel airborne optical sensor for studying the radiative impact of cirrus clouds and correlating the particle habit-scattering properties which will serve as a reference for other single, or multi-independent, measurement instruments.
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000017426 7001_ $$0P:(DE-HGF)0$$aSchnaiter, M.$$b1
000017426 7001_ $$0P:(DE-HGF)0$$aAmsler, P.$$b2
000017426 7001_ $$0P:(DE-HGF)0$$aHesse, E.$$b3
000017426 7001_ $$0P:(DE-Juel1)129137$$aMeyer, J.$$b4$$uFZJ
000017426 7001_ $$0P:(DE-HGF)0$$aLeisner, T.$$b5
000017426 773__ $$0PERI:(DE-600)2505596-3$$a10.5194/amt-4-2125-2011$$gVol. 4, p. 2125 - 2142$$p2125 - 2142$$q4<2125 - 2142$$tAtmospheric measurement techniques$$v4$$x1867-1381$$y2011
000017426 8567_ $$uhttp://dx.doi.org/10.5194/amt-4-2125-2011
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