Stratospheric Dust and its Relationship to the Meteoric Influx

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Scientific paper

A review of measurements sensitive to dust in the stratosphere is presented with special emphasis on the data obtained during the last 10 years. The measurements made by indirect techniques such as light scattering tend to show more stratospheric dust than the measurements obtained by direct sampling techniques, although this interpretation is somewhat complicated by the injection of dust from the Bali eruption in 1963. The discrepancy is interpreted as indicating that the stratospheric dust smaller than a few microns diameter is volital. Recent direct experimental evidence of the author supports this conclusion. The size distribution of stratospheric dust is presented as a composite of the results of several observers. A natural break in the distribution at a size of about 5μ diameter is interpreted as indicating that the smaller dust is terrestrial in origin, while the larger dust is meteoric in origin. Other evidence is presented to support this conclusion. A comparison with particle flux measurements at 100 km and higher indicates that the meteoric component of the stratospheric dust is ablation products rather than single particles that have survived entry into the atmosphere. It is also argued that the small particles accounting for the high flux as measured by rocket and satellite microphone techniques are not present in the stratosphere.

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