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MODELING OF TURBULENCE EFFECT ON RADAR REFLECTIVITY FACTOR IN CLOUDS

Keigo Matsuda
Earth Simulator Center Japan Agency for Marine-Earth Science and Technology (JAMSTEC) 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan

Ryo Onishi
Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku Yokohama Kanagawa 236-0001, Japan also Department of Aeronautics, Imperial College London, SW7 2AZ, UK

Masaaki Hirahara
Department of Mechanical Engineering and Science Advanced Research Institute of Fluid Science and Engineering Kyoto University Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan

Keiko Takahashi
Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku Yokohama Kanagawa 236-0001, Japan

Ryoichi Kurose
Department of Mechanical Engineering and Science, and Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto 615–8540, Japan

Satoru Komori
Department of Mechanical Engineering and Science Kyoto University Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8140, Japan

Resumo

This study proposes a radar reflectivity factor model considering the effect of turbulent clustering of cloud droplets. A three-dimensional direct numerical simulation of particle-laden isotropic turbulence is conducted to obtain turbulent clustering data. The power spectrum of droplet number density fluctuation, on which the radar reflectivity factor depends, is calculated from the turbulent clustering data. The power spectrum shows strong dependency on the Stokes number. It is confirmed that the proposed model can predict the Stokes number and the wavenumber dependencies of the turbulent clustering effect.