The radar simulator: deriving the radar signal using the cloud model output

Aleksandra E. Kardas; Sally McFarlane; Hugh Morrison; Jennifer Comstock; Wojciech W. Grabowski; Szymon P. Malinowski

doi:10.1117/12.830100

29 September 2009 The radar simulator: deriving the radar signal using the cloud model output

Aleksandra E. Kardas, Sally McFarlane, Hugh Morrison, Jennifer Comstock, Wojciech W. Grabowski, Szymon P. Malinowski

Proceedings Volume 7475, Remote Sensing of Clouds and the Atmosphere XIV; 74751M (2009) https://doi.org/10.1117/12.830100
Event: SPIE Remote Sensing, 2009, Berlin, Germany

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.

Citation Download Citation

Aleksandra E. Kardas, Sally McFarlane, Hugh Morrison, Jennifer Comstock, Wojciech W. Grabowski, and Szymon P. Malinowski "The radar simulator: deriving the radar signal using the cloud model output", Proc. SPIE 7475, Remote Sensing of Clouds and the Atmosphere XIV, 74751M (29 September 2009); https://doi.org/10.1117/12.830100

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KEYWORDS

Clouds

Radar

Particles

Reflectivity

Crystals

Atmospheric modeling

Signal attenuation

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