Computer Science
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..98..287t&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 98, no. 3-4, June 1990, p. 287-302. Research supported by the Univers
Computer Science
7
Balloon-Borne Instruments, Chemical Composition, Iron, Microparticles, Silicates, Stratosphere, Electron Diffraction, Electron Microscopy, High Altitude
Scientific paper
Stratospheric particles were collected between 34 and 36 km, using a combination of cascade impactors and filters lofted by a large helium balloon, and the particle concentration, size distribution, and bulk elemental composition were determined using SEM and proton-induced X-ray emission (PEXE) instrument. In addition, datailed particle morphology, elemental analysis, and electron diffraction data were obtained on 23 particles using a TEM. The concentration of particles between 0.045 and 1.0 micron in radius was found to be orders of magnitude above the concentrations predicted by the model of Hunten et al. (1980), but was consistent with balloon and satellite observations. Elemental composition analysis showed the presence of Cl, S, Ti, Fe, Br, Ni, Zr, Zn, Sr, and Cu in decreasing order of concentration. The 23 particles analyzed by TEM ranged from Al-rich silicates to almost pure Fe to one containing almost exclusively Ba and S. None were definitely chondritic in composition.
Berg Walter W.
Cahill Thomas A.
Onaka Takashi
Stephens John R.
Testa John P. Jr.
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