Sentences with phrase «column ozone loss»

Figure 2: Total column ozone loss relative to pre-ozone hole conditions in the 1970s in percent (left) and total number of molecules (right)(1 DU = 2.69 molecules / cm2) averaged over 2010 - 2019, during September for the Southern Hemisphere and March for the Northern Hemisphere.

In terms of the springtime Antarctic total column ozone losses (ozone hole), the system has not recovered, but the rapid expansion of the pre-Montreal Protocol period has been reversed to modest declines.

Not exact matches

The figure for the column between 12 and 20 kilometres altitude was a record low of 18 Dobson units, representing a loss of 83 per cent of the ozone in that layer.

E.g. in 1999/2000 about 30 % of the total column ozone was destroyed by anthropogenic chemical loss, which is considerably less than the maximum loss at 19 - 20 km altitude.