Dobson unit


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Related to Dobson unit: ozone hole, ozone layer

Dobson unit

[′däb·sən ‚yü·nət]
(meteorology)
The unit of measure for atmospheric ozone; one Dobson unit is equal to 2.7 × 1016 ozone molecules per square centimeter, which would be equivalent to a layer of ozone 0.001 centimeter thick, at 1 atmosphere and 0°C.
References in periodicals archive ?
In 1995, that instrument was no longer working, but balloon-borne instruments measured near-record values below 100 Dobson units in the atmosphere above the South Pole.
He and his colleagues recorded a low of 100 Dobson units of ozone on Sept.
6, the balloon ozone sensors detected only 90 Dobson units of ozone, a reading corroborated by a ground-based spectrometer.
In contrast to the satellite data -- which indicate that this year's lowest ozone concentration was roughly 126 Dobson units -- balloon measurements made on Oct.
6, the concentration of ozone over parts of Antarctica dropped to 110 Dobson units, beating a record of 121 Dobson units, set in 1987, says NASA's Arlin Krueger.
Balloon-borne sensors measured ozone values as low as 195 Dobson units during the second week of September, 1 week earlier than usual, says Samuel J.
Satellite measurements show that the ozone concentration in the Antarctic stratosphere -- 12 to 50 kilometers up -- reached 125 Dobson units on Oct.
TOMS data show that the minimum ozone level over Antarctica plummeted from 200 Dobson units in mid-August to 133 Dobson units in mid-September.
In that slab we've gone from 50 Dobson units [of ozone] at the end of August to something like 5 Dobson units," Hofmann says.