title: Turbulence effect on cloud radiation.
abstract: The effect of turbulent clustering of water droplets on radiative transfer is investigated by means of both a three-dimensional direct numerical simulation of particle-laden homogeneous isotropic turbulence and a radiative transfer simulation based on a Monte Carlo photon tracing method. The results show that turbulent clustering causes the formation of void regions of droplets and hence increases the direct transmittance. This effect decreases as the turbulent Reynolds number increases and is estimated to be negligibly small under the conditions in real clouds.
authors.affiliation: Department of Mechanical Engineering and Science, Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Kyoto 606-8501, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Matsuda
authors.forename: R
authors.initials: R
authors.lastname: Onishi
authors.forename: R
authors.initials: R
authors.lastname: Kurose
authors.forename: S
authors.initials: S
authors.lastname: Komori