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Dobson spectrophotometer in Dolgoprudny
The
Dobson Spectrophotometer is used for total ozone observations in the
atmosphere. The earliest Dobson Spectrophotometer was built in the
mid 1920s by G.M.B. Dobson for the purpose of investigating atmospheric
circulation by measuring changes in atmospheric ozone. This ground-based
instrument measures column ozone by the technique of differential absorption of
ultraviolet (UV) light with the sun (or moon) as a light source. By comparing
the UV light intensity at wavelengths that are strongly absorbed and weakly
absorbed by ozone, the column ozone content of the atmosphere is accurately determined.
In addition to the 16 ESRL Cooperative Dobson Network stations, total column
ozone is measured from about 80 sites around the world.
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