Point 14 of 16 — Module 10 — Chemical Reactions in the Atmosphere: Ultraviolet Radiation and OzoneQuestion bank: 0 questions (0 with pictures)
14 6A.2 Measuring ozone
Ozone is measured by (i) ground spectrometers (the Dobson instrument) that compare sunlight at two UV wavelengths, one absorbed by ozone and one not; (ii) balloons carrying small ozone sensors (ozonesondes); and (iii) satellites measuring the UV scattered from the atmosphere.
The column is expressed in Dobson units; the global average is about 300 DU, and a value below 220 DU is the conventional boundary of the "ozone hole".
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