INSTRUMENTS FOR MEASURING STRATOSPHERIC OZONE
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FIGURE 1.11 The ground-based Dobsonmeter (left) is capable of making accurate measurements of stratospheric ozone concentrations—but over a limited area. In contrast, the satellite-based Total Ozone Mapping Spectrometer, or TOMS (right), is capable of measuring concentrations of stratospheric ozone over large areas.
(©SSPL/The Image Works); (NASA)