The ability to predict severe ice storm events is an essential step to prevent or mitigate power grid outages caused by extreme wind and ice loads. We have shown previously that an Ice Accretion Forecasting System (IAFS) can predict severe ice storms several days in advance. However, identifying the storms’ maximum intensities and localizing their epicentres remain challenges to be addressed. I...

A combination of the finite-difference time domain technique and a ray-by-ray integration method has been applied to compute the extinction efficiency and singlescattering albedo for various size distributions associated with nonspherical ice crystals in laboratory and natural cirrus clouds. The two methods are applicable to small and large size parameters, respectively. The results obtained by...

Submitted for the MAR05 Meeting of The American Physical Society First Principles Simulations of Ice Nucleation at Metal Surfaces ANGELOS MICHAELIDES, MATTHIAS SCHEFFLER, Fritz-Haber-Institut — Ice nucleation at solid surfaces is of relevance to countless scientific and technological processes. In particular the nucleation of ice nano-crystals on metal surfaces is often a key first step in clou...

Cloud condensation and ice nuclei in the troposphere are required precursors to cloud and precipitation formation, both of which influence the radiative balance of Earth. The initial stage of hailstone formation (i.e., the embryo) and the subsequent layered growth allow hail to be used as a model for the study of nucleation processes in precipitation. By virtue of the preserved particle and iso...

In this second article in a two-part work, S-Pol polarimetric data collected during TiMREX (Terraininfluenced Monsoon Rainfall Experiment) is analyzed and used to infer the storm microphysics. Both simultaneous horizontal (H) and vertical (V) transmit polarization data and fast alternating H and V transmit polarization data are used in the analysis. Dual-Doppler synthesis and sounding data char...

The technique based on the concept of successive modification of simple shapes using elementary mathematical functions to represent the shape and size of ice crystals in clouds is discussed. Two hypothetical samples of ice crystals, a single-habit sample of hexagonal plates and a multihabit crystal sample, are generated using a formula developed previously to illustrate the use of this techniqu...

The presence of ions in liquid crystals is one of the grand challenges that hinder the application of liquid crystals in various devices, which include advanced 3-D and flexible displays, tunable lenses, etc. Not only do they compromise the overall performance of liquid crystal devices, ions are also responsible for slow response, image sticking, and image flickering, as well as many other nega...

Crystal growth control is essential in various fields of science and technology (e.g., chemistry, materials science, pharmaceutical development). The concept of molecular recognition has been successfully used to elucidate the effects of additives (foreign ions or molecules) on crystal growth. Peptides and proteins are often used in vivo and in vitro to control the growth of minerals and produc...