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Dust in the wind
July 02, 2001
dust and aerosol migration animated gif
People may think of the ground under their feet as being stationary, but the soil and dust of the world is constantly on the move, blown aloft by the wind—sometimes across entire oceans. Over vast stretches of geologic time, the action of wind thoroughly mixes and re-mixes the world’s dust. So the soil in your own backyard might contain some grains of dust from places all over the globe. The dust, originating from fine particles in the arid topsoil, is transported into the atmosphere by winds and may be carried more than 10,000 feet high. This image shows the airborne dust migration between June 12th and 21st. You can also see daily maps at the aerosol homepage of NASA’s Total Ozone Mapping Spectrometer (TOMS).
image/text: NASA

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