What IS a dobson unit?

The Dobson integer (DU) is a integer connected with measurement connected with atmospheric ozone, concretely ozone in the stratospheric ozone layer. One Dobson unit refers on a layer of ozone such would be 10 µm excessive under standard temperature also pressure.For example, 300 DU of ozone brought slumping to the surface of the Earth at 0 °C would permeate a layer only 3 mm thick. One DU is 2.69×1016 ozone molecules per square centimetre, or 2.69×1020 per square metre. This is 0.447 millimoles of ozone per just metre.

A baseline bearing of 220 DU is sort equally the starting peculiarity for an ozone hole since total ozone bearing connected with less than 220 Dobson Units were not found in the historic observations over Antarctica aforementioned to 1979. Also, from show weight over Antarctica, a column ozone precise of less than 220 Dobson Units is a result connected with the ozone casualty coming out of chlorine and bromine compounds.

The Dobson integer is named postern Gordon Dobson, who was a researcher on the University of Oxford. In the 1920s, he wellrounded the primitive instrument to measure total ozone coming out of the ground, now called the Dobson ozone spectrophotometer.