Journal
SCIENCE
Volume 291, Issue 5509, Pages 1772-1775Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1057737
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Single-particle analyses of stratospheric aerosol show that about half of the particles contain 0.5 to 1.0 weight percent meteoritic iron by mass, requiring a total extraterrestrial influx of 8 to 38 gigagrams per year. The sodium/iron ratio in these stratospheric particles is higher and the magnesium/iron and calcium/iron ratios are Lower than in chondritic meteorites, implying that the fraction of material that is ablated must lie at the Low end of previous estimates and that the extraterrestrial component that resides in the mesosphere and stratosphere is not of chondritic composition.
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