Dobson

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The measurement of total column ozone with spectrometers is an analytical technique with a long historical background. The first measurements with a Dobson Ozone Spectrophotometer were conducted in the mid-twenties. A global network of Dobson instruments was established during the years following the first International Geophysical Year in 1957. A modern instrument, the Brewer Ozone Spectrophotometer, was developed in the nineteen seventies and introduced into the global network in 1982 with the delivery of instruments to Greece, Sweden, Germany and Canada.

The basic measurement principle of both types of spectrometers is the same. The thickness of the ozone layer is determined by comparing the intensity of solar radiation that has passed through the atmosphere at wavelengths in the ultraviolet that are strongly and weakly absorbed by ozone. The Dobson utilizes a kind of internal virtual 'ozone layer' (a variable attenuator called an 'optical wedge') to measure the intensity ratio of two wavelengths, the Brewer directly measures the intensity of light at a number of different wavelengths in the ultraviolet. The physical principles and instrumental characteristics of these methods are well known and acknowledged and therefore do not need any further justification as a primary technique for the NDACC. It is, however, important, to characterize the individual instruments of both spectrometer types and to determine their specific calibration constants. NDACC has about 20 NDACC affiliated Dobson and Brewer instruments.

Locations

Melbourne, Australia (37.67S, 144.83E)

Ozone

Public Data:
Macquarie Island, Australia (54.50S, 158.95E)

Ozone

Model: D012
Public Data:
Arrival Heights, Antarctica (77.83S, 166.67E)

Ozone

Model: D017
Public Data:
Wallops Island, VA, United States (37.94N, 75.46W)

Ozone

Model: D038
Public Data:
Uccle, Belgium (50.8N, 4.35E)

Ozone

Model: D040
Public Data:
Cape Matatula, Samoa, United States (14.25S, 170.56W)

Ozone

Model: D042
Public Data:
South Pole, Antarctica (90S, NAE)

Ozone

Model: D042
Public Data:
Lannemezan, France (43.12N, .38E)

Ozone

Model: D049
Public Data:
Observatoire de Bordeaux, France (44.83N, .52W)

Ozone

Model: D049
Public Data:
Boulder, CO, United States (39.99N, 105.26W)

Ozone

Model: D061
Public Data:
Lauder, New Zealand (45.04S, 169.68W)

Ozone

Model: D072
Public Data:
Mauna Loa, HI, United States (19.54N, 155.58W)

Ozone

Model: D076
Public Data:
Darwin, Australia (12.42S, 130.89E)

Ozone

Model: D078
Public Data:
Observatoire de Haute Provence, France (43.94N, 5.71E)

Ozone

Model: D085
Public Data:
Barrow, AK, United States (71.32N, 156.68W)

Ozone

Model: D091
Public Data:
Arosa, Switzerland (46.78N, 9.68E)

Ozone

Model: D101, D062
Public Data:
Hohenpeissenberg, Germany (47.80N, 11.02E)

Ozone

Model: D104
Public Data:
Brisbane, Australia (27.39S, 153.13E)

Ozone

Model: D111
Public Data: