The bromine content of micrometeorites - Arguments for stratospheric contamination

Details The bromine content of micrometeorites - Arguments for stratospheric contamination The bromine content of micrometeorites - Arguments for stratospheric contamination

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7409r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E4, p. 7409-7414.

Physics

14

Atmospheric Effects, Bromine, Contamination, Meteoritic Composition, Micrometeorites, Stratosphere, Atmospheric Chemistry, Sulfuric Acid, Meteorites, Micrometeorites, Bromine, Abundance, Composition, Salts, Interplanetary Dust, Particles, Chondritic Material, Stratopsphere, Samples, Extraterrestrial, Models, Laboratory Studies, Sulfuric Acid, Electron Microscopy, Tem, Aem, W7029E5

Scientific paper

Bromine-salt nanocrystals are associated with a porous chondritic micrometeorite (W7029E5) that was collected in the lower stratosphere. These salt nanocrystals occur together with volcanic Na and K salt nanocrystals embedded in sulfuric acid droplets that were originally adhered to the particle. These materials were concentrated during hexane rinsing as part of routine curation procedures at the NASA Johnson Space Center Cosmic Dust Curatorial Facility. This observation is fortuitous to the extent that the concentration of nanocrystals and sulfuric acid is an experimental artifact of curation. If bromine is a stratospheric contaminant due to surface adsorption, there should be a positive linear relationship between the mass-normalized residence time and bromine content of individual micrometeorites. I show that the predicted correlation exists using a new model to calculate the stratospheric residence time of individual nonspherical micrometeorites in the slow-settling Wilson-Huang regime of the stratosphere.

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