The nature of dust collected at high altitudes

Details The nature of dust collected at high altitudes The nature of dust collected at high altitudes

Jun 1961

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..24...10f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 24, Issue 1-2, pp.10-12

Physics

9

Scientific paper

Dust was collected from the atmosphere at altitudes above 40,000 feet by devices mounted on airplanes or balloons. The spatial density of the dust particles larger than 3 microns varied from less than one per five cubic meters to twelve particles per cubic meter. The particles appeared to be present in the form of dust clouds. Individual particles were analyzed for the elements, iron, nickel, cobalt, manganese, chromium, copper, and zinc with an electron-probe microanalyzer, and for aluminum and cobalt by neutron activation. Sixty-five specimens were analyzed. Most particles contained from 0.1% to 90% iron while some contained copper, zinc, or manganese in addition. None had detectable amounts of nickel, cobalt, or chromium. An upper limit of 30,000 tons per year for the entire earth was obtained for the accretion rate of particles between 3 and 30 microns in size with an iron-nickel-cobalt ratio similar to that of meteorites. Many of the particles could represent possible terrestrial contamination, but this explanation is improbable for the iron-manganese particles.

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