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The
Ozone Hole September 2011
The
Ozone Hole 2011
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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