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O’Connor: Theory and observations of ice particle evolution in cirrus using Doppler radar: Evidence for aggregation Geophysical
- Research Letters
"... Vertically pointing Doppler radar has been used to study the evolution of ice particles as they sediment through a cirrus cloud. The measured Doppler fall speeds, together with radar-derived estimates for the altitude of cloud top, are used to estimate a characteristic fall time tc for the ‘average’ ..."
Abstract
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Cited by 4 (2 self)
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Vertically pointing Doppler radar has been used to study the evolution of ice particles as they sediment through a cirrus cloud. The measured Doppler fall speeds, together with radar-derived estimates for the altitude of cloud top, are used to estimate a characteristic fall time tc for the ‘average’ ice particle. The change in radar reflectivity Z is studied as a function of tc, and is found to increase exponentially with fall time. We use the idea of dynamically scaling particle size distributions to show that this behaviour implies exponential growth of the average particle size, and argue that this exponential growth is a signature of ice crystal aggregation. 1.
unknown title
, 2006
"... Theory and observations of ice particle evolution in cirrus using Doppler radar: evidence for aggregation ..."
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Theory and observations of ice particle evolution in cirrus using Doppler radar: evidence for aggregation
Atmospheric Measurement Techniques Fall speed measurement and high-resolution multi-angle photography of hydrometeors in free fall
, 2012
"... Abstract. We describe here a new instrument for imaging hy-drometeors in free fall. The Multi-Angle Snowflake Camera (MASC) captures high-resolution photographs of hydrom-eteors from three angles while simultaneously measuring their fall speed. Based on the stereoscopic photographs cap-tured over th ..."
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Abstract. We describe here a new instrument for imaging hy-drometeors in free fall. The Multi-Angle Snowflake Camera (MASC) captures high-resolution photographs of hydrom-eteors from three angles while simultaneously measuring their fall speed. Based on the stereoscopic photographs cap-tured over the two months of continuous measurements ob-tained at a high altitude location within the Wasatch Front in Utah, we derive statistics for fall speed, hydrometeor size, shape, orientation and aspect ratio. From a selection of the photographed hydrometeors, an illustration is pro-vided for how the instrument might be used for making im-proved microwave scattering calculations. Complex, aggre-gated snowflake shapes appear to be more strongly forward scattering, at the expense of reduced back-scatter, than heav-ily rimed graupel particles of similar size. 1
CentAUR
"... Theory and observations of ice particle evolution in cirrus using Doppler radar: evidence for aggregation ABCDEFB ..."
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Theory and observations of ice particle evolution in cirrus using Doppler radar: evidence for aggregation ABCDEFB
Theory and observations of ice particle evolution in cirrus using Doppler radar: Evidence for
"... [1] Vertically pointing Doppler radar has been used to study the evolution of ice particles as they sediment through a cirrus cloud. The measured Doppler fall speeds, together with radar-derived estimates for the altitude of cloud top, are used to estimate a characteristic fall time tc for the ‘aver ..."
Abstract
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[1] Vertically pointing Doppler radar has been used to study the evolution of ice particles as they sediment through a cirrus cloud. The measured Doppler fall speeds, together with radar-derived estimates for the altitude of cloud top, are used to estimate a characteristic fall time tc for the ‘average ’ ice particle. The change in radar reflectivity Z is studied as a function of tc, and is found to increase exponentially with fall time. We use the idea of dynamically scaling particle size distributions to show that this behaviour implies exponential growth of the average particle size, and argue that this exponential growth is a signature of ice crystal aggregation. Citation: Westbrook,
