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The Ozone Hole July 2019
The total ozone maps are based on ground-based measurements available from
the World Ozone and
Ultraviolet Radiation Data Centre. Preliminary near real-time data
from ground-based observations were also used for the most recent maps.
Total ozone values are given in
Dobson Units. The numbers represent observations taken from ground
stations situated at the bottom left corner of the number.
Maps of deviations represent total ozone deviations from the 1978-1988 level estimated using Total Ozone Mapping Spectrometer (TOMS) data for all areas except the Antarctic and from the pre-1980 level estimated using Dobson data over the Antarctic. Over areas with poor data coverage adjustments are made according to TOMS on Nimbus-7, Meteor-3, ADEOS and Earth Probe satellites. Over the polar night area Dobson and Brewer moon observations and/or NOAA's TIROS Operational Vertical Sounder (TOVS) satellite data are used. TOVS data are also used when the more reliable TOMS data are not available. The mapping algorithm is similar to those used by the WMO Ozone Mapping Centre. Credit:
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