Accession Number : AD0718527

Title :   Cirrus Clouds as Collectors of Aerosol Particles,

Corporate Author : NATIONAL CENTER FOR ATMOSPHERIC RESEARCH BOULDER COLO

Personal Author(s) : Rosinski,J. ; Nagamoto,C. T. ; Langer,G. ; Parungo,F. P.

Report Date : 13 FEB 1970

Pagination or Media Count : 14

Abstract : Water-insoluble aerosol particles larger than 2 micrometers diameter in cirrus and other types of iced clouds were studied according to three classes: nonmagnetic particles, nonspherical magnetic particles, and magnetic spherules. Although the concentrations of particles varied considerably within the cloud, generally similar size distributions were found for all three classes at various locations within a cloud. Particle concentration generally decreased with increasing particle size. The different size distribution of magnetic spherules found on some occasions indicates that their origin differs from that of other classes. For further study, magnetic spherules were divided into four subclasses according to shape (spherical and oblong) and surface texture (smooth and rough). Though the average abundance of each subclass of spherules present in cirrus is similar to that in air, very large differences may occur on some occasions. Chemical determinations of Ca, Na, Fe, and Ni were made for the nonmagnetic (nm) and magnetic (m) particles. Nickel was found in only 4 of 32 samples. (Author)

Descriptors :   (*CIRRUS CLOUDS, AEROSOLS), (*AEROSOLS, COLLECTING METHODS), PARTICLES, ICE, CONVECTION(ATMOSPHERIC), THUNDERSTORMS, NUCLEATION, THERMAL PROPERTIES, PHASE STUDIES, PARTICLE SIZE, SPHERES, RAINFALL, MAGNETIC PROPERTIES, CALCIUM COMPOUNDS, SODIUM COMPOUNDS, IRON COMPOUNDS, NICKEL COMPOUNDS, COLORADO

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE