He and his colleagues recorded a low of 100 Dobson units
of ozone on Sept.
The previous record low, set last year, was 105 Dobson units
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
TOMS data show that the minimum ozone level over Antarctica plummeted from 200 Dobson units
in mid-August to 133 Dobson units