Abstract: Ice crystals in supercooled clouds may form upon ice nuclei, or they may arise through secondary processes. Two of these secondary ice ?multiplication? mechanisms are discussed in some detail: the rime-splintering process ...

Abstract: Measurements of drop concentration and size distribution with the Clague droplet gun and the Forward Scattering Spectrometer Probe in 21 cumulus clouds on five days show no evidence of systematic differences between the ...

Abstract: No abstract available.

Abstract: Some cumulus clouds appear to be capable of producing ice crystals in concentrations of 10?100l?1 at temperatures approaching ?5C. This has serious implications for cloud seeding with ice nuclei. We discuss various possible ...

Abstract: No abstract available.

Abstract: Field evidence of high ice crystal concentrations in cumulus clouds at temperatures warmer than ?10°C is consistent with the operation of a Hallett-Mossop ?multiplication? process. This mechanism requires the generation ...

Abstract: Measurements of ice crystal concentration in five clouds in northern New South Wales are reported. These confirm earlier studies in which it was found that glaciated altostratus clouds contain approximately the same ...

Abstract: The membrane filter technique for detecting ice nuclei in atmospheric air has the disadvantage that the measured concentration decreases with the volume of air sampled. Various possible causes are investigated. The effect ...

Abstract: The Warren-Nesbitt generator is widely used in Australia and other countries for producing a cloud seeding aerosol by burning a solution of silver iodide and sodium iodide in acetone. It is found that the particle size ...

Abstract: A long-lived cumulus cloud off the southern coast of Australia was found to contain ice crystals, even though the coldest temperature in it was about ?4C. Two instrumented aircraft made successive passes through the cloud ...