A Parameterization of the Particle Size Spectrum of Ice Clouds in Terms of the Ambient Temperature and the Ice Water Content

TLDR

The study examined a cirrus cloud dataset to determine how particle size spectral form and crystal habit depend on temperature. Researchers analyzed the data and proposed a preliminary parameterization of particle size spectra for crystals larger than 20 µm as a function of temperature and ice water content. They found that spectral form and crystal habit vary systematically with temperature, especially between –40 °C and –50 °C, consistent with prior backscatter studies, and they estimated the visible extinction in cirrus.

Abstract

A data set obtained in cirrus clouds has been examined to deduce any dependencies of the particle size spectral form or the crystal habit on the temperature. It was found that both form of the spectra and crystal habit changed systematically with temperature, the largest change occurring between −l40 and −50°C. These findings are consistent with previously found dependencies between linear backscatter measurements and temperature. A preliminary scheme for parameterizing the cirrus particle size spectra for crystal dimensions greater than 20 μm in terms of the temperature and the ice water content is described. The visible extinction in cirrus is estimated.