We model the 10 µm absorption spectra of nonspherical particles composed of amorphous silicate. We consider two classes of particles, compact ones and fractal aggregates composed of homogeneous spheres. For the compact particles we consider Gaussian random spheres with various degrees of non-sphericity. For the fractal aggregates we compute the absorption spectra for various fractal dimensions....

Abstract Obtaining accurate high-resolution representations of model outputs is essential to describe the system dynamics. In general, however, only spatially- and temporally-coarse observations states are available. These can also be corrupted by noise. Downscaling a process/scheme in which one uses coarse scale reconstruct solution states. Continuous Data Assimilation (CDA) recently introduce...

This tutorial is devoted to the Maxwell Garnett approximation and related theories. Topics covered in this first, introductory part of the tutorial include the Lorentz local field correction, the Clausius-Mossotti relation and its role in the modern numerical technique known as the discrete dipole approximation, the Maxwell Garnett mixing formula for isotropic and anisotropic media, multicompon...

We apply the discrete dipole approximation (DDA) to estimate the radiation pressure cross section for fluffy aggregates by computing the asymmetry parameter and the cross sections for extinction and scattering. The ballistic particle—cluster aggregate and the ballistic cluster—cluster aggregate consisting of either dielectric or absorbing material are considered to represent naturally existing ...

It is well accepted that uncertainties still persist regarding the quantitative contribution of ice clouds to the radiative balance of the Earth [1]. Techniques for modelling the interaction of light with ice crystals found in these clouds have helped reduce this uncertainty; however techniques such as the discrete dipole approximation (DDA) [2] and T-matrix [3] are computationally expensive fo...