The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of ________.
The correct answer is Dobson Units (DU).
Instruments like the Dobson spectrophotometer and satellite-based sensors measure the intensity of sunlight at different UV wavelengths to determine the total column ozone amount. Significant drops in DU values, particularly in polar regions during spring, indicate ozone depletion, often referred to as the ozone hole. This depletion allows more harmful UV-B radiation to reach the Earth's surface, posing risks to human health (skin cancer, cataracts) and ecosystems.
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