NOAA scientists monitor the thickness of the ozone layer and its vertical distribution above the South Pole station by regularly releasing weather balloons carrying ozone-measuring "sondes" up to 21 miles in altitude, and with a ground-based instrument called a Dobson spectrophotometer.
The Dobson spectrophotometer measures the total amount of ozone in a column extending from Earth's surface to the edge of space in Dobson Units, defined as the number of ozone molecules that would be required to create a layer of pure ozone 0.
In some parts of the planet TOC changeability monitoring is carried out by means of land devices, the most absolute of which is Dobson spectrophotometer, with measuring error 7.
which is less than the TOC error measurement, provided by the Dobson spectrophotometer.
This November marks the 50th anniversary of the start of total ozone column measurements by the NOAA Dobson spectrophotometer
instrument at South Pole station.
The instruments used for these measures have been the Dobson Spectrophotometer #120 and the Brewer MK-III Spectroradiometer #150.
The ozone database with the Dobson spectrophotometer covers since 1980 to present days.
Examples of specific topics covered include aircraft electrification, airmass, anabatic wind, boundary layer, convection, Dansgaard-Oeschger event, Dobson spectrophotometer
, gradient wind, katabatic wind, meteorology, noble gases, pollution control, temperature scales, waterspout, and Venturi effect.
Researchers there took measurements with the Dobson spectrophotometer
, a reliable and easy-to-operate tool still in use.
Several weeks before the eclipse I calibrated TOPS against the secondary world-standard Dobson spectrophotometer
in Boulder, Colorado.