Ozone Layer

The ozone layer is a layer in Earth's atmosphere which contains relatively high concentrations of  ozone (O3). This layer absorbs 97-99% of the sun's high frequency ultraviolet light which is potentially damaging to life on Earth. Over 90% of ozone in earth's atmosphere is present here. "Relatively high" means a few parts per million—much higher than the concentrations in the lower atmosphere but still small compared to the main components of the atmosphere. It is mainly located in the lower portion of the  stratosphere from approximately 15 km to 35 km above Earth's surface, though the thickness varies seasonally and geographically. The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson. Its properties were explored in detail by the British meteorologist G. M. B. Dobson, who developed a simple spectrophotometer that could be used to measure stratospheric ozone from the ground. Between 1928 and 1958 Dobson established a worldwide network of ozone monitoring stations which continues to operate today. The "Dobson unit", a convenient measure of the total amount of ozone in a column overhead, is named in his honor.
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Noun
1. a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
(synonym) ozonosphere
(hypernym) layer
(part-holonym) stratosphere
(part-meronym) ozone hole

The protective layer in the atmosphere, about 15 miles above the ground, that absorbs some of the sun's ultraviolet rays, thereby reducing the amount of potentially harmful radiation that reaches the earth's surface.

The layer of gaseous ozone (O3) in the stratosphere that protects life on earth by filtering out harmful ultraviolet radiation from the sun. See stratosphere, ultraviolet radiation.

ozone layer
danh từ tầng Ozon
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