The Global Transport of Dust: An Intercontinental River of Dust, Microorganisms and Toxic Chemicals flows Through the Earth's Atmosphere
Griffin D, Kellogg C, Garrison V, Shinn E. 2002. The Global Transport of Dust: An Intercontinental River of Dust, Microorganisms and Toxic Chemicals flows Through the Earth's Atmosphere. American Scientist. 90(No. 3):228-235
By some estimates as much as two billion metric tons of dust are lifted into the Earth's atmosphere every year. Most of this dust is stirred up by storms, the more dramatic of which are aptly named dust storms. But more than mere dirt is carried aloft. Drifting with the suspended dust particles are soil pollutants such as herbicides and pesticides and a significant number of microorganisms bacteria, viruses and fungi. We can gain some appreciation of how much microbial life is actually floating in our atmosphere by performing a quick calculation. There are typically about one million bacteria per gram of soil, but let's be conservative and suppose there are only 10,000 bacteria per gram of airborne sediment. Assuming a modest one billion metric tons of sediment in the atmosphere, these numbers translate into a quintillion (1018) sediment-borne bacteria moving around the planet each year-enough to form a microbial bridge between Earth and Jupiter.
- Type
- Journal Article
- Authors
- Griffin, Dale; Kellogg, Christina; Garrison, Virginia; Shinn, Eugene
- Units
- SFCN
- Keywords
- aeromicrobiology, African dust, Air borne, asian dust, Caribbean, Contaminants, Microbiology, North America