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Proceedings Paper

The radar simulator: deriving the radar signal using the cloud model output
Author(s): Aleksandra E. Kardas; Sally McFarlane; Hugh Morrison; Jennifer Comstock; Wojciech W. Grabowski; Szymon P. Malinowski
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Paper Abstract

We present an approach to simulate cloud radar signals on the basis of cloud model output, the radar simulator. The simulator is being developed to aid validation of the cloud model. The cloud model applies double-moment bulk warm-rain and ice schemes developed by Morrison and Grabowski.1, 2 As an input, the simulator uses profiles of the mixing ratios and number concentrations of cloud droplets, rain/drizzle drops, and ice crystals, as well as the air temperature. For the ice crystals, the rimed mass fraction predicted by the ice scheme is also used. The simulator applies precomputed look-up tables containing scattering properties of cloud and precipitation particles, such as reflectivities, extinction and absorption coefficients. For each grid point, the coefficients are integrated over particle size distributions and summed over hydrometeor types. Consistent with assumptions in the cloud model microphysical scheme, modified gamma size distributions are assumed for cloud droplets and ice crystals, whereas the exponential Marshall-Palmer size distribution is assumed for the rain/drizzle drops. Application of the radar simulator to a simulation of clouds observed during the TWP-ICE campaign over northern Australia is presented.

Paper Details

Date Published: 29 September 2009
PDF: 10 pages
Proc. SPIE 7475, Remote Sensing of Clouds and the Atmosphere XIV, 74751M (29 September 2009); doi: 10.1117/12.830100
Show Author Affiliations
Aleksandra E. Kardas, Univ. of Warsaw (Poland)
Sally McFarlane, Pacific Northwest National Lab. (United States)
Hugh Morrison, National Ctr. for Atmospheric Reserach (United States)
Jennifer Comstock, Pacific Northwest National Lab. (United States)
Wojciech W. Grabowski, National Ctr. for Atmospheric Reserach (United States)
Szymon P. Malinowski, Univ. of Warsaw (Poland)

Published in SPIE Proceedings Vol. 7475:
Remote Sensing of Clouds and the Atmosphere XIV
Richard H. Picard; Klaus Schäfer; Adolfo Comeron; Evgueni I. Kassianov; Christopher J. Mertens, Editor(s)

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