Ozone maps available on this Website:
Canada Maps:
The Most Recent Full-Day Total Ozone Map for Canada
The total ozone map is based on ground-based measurements
by Brewer spectrophotometers carried out by
the Science and Technology Branch.
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. The
numbers marked by the “*” symbol are obtained using indirect method
of measurements and are less reliable.
The numbers on the maps indicate total ozone values in Dobson Units
measured at ground-based stations. For more information on ground-based
ozone measurements visit the
WOUDC Web site.
Over areas with poor data coverage adjustments are made according to NASA's
Total Ozone Mapping Spectrometer (TOMS)
on Earth Probe satellites.
Over the polar night area Brewer moon observations and/or NOAA's
TIROS Operational Vertical Sounder (TOVS)
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.
Maps of deviations represent
total ozone deviations from the 1978-1988 level estimated using
TOMS data.
These maps are normally updated
daily at about 1400
UTC.
However, this near-real-time system is automated, so
if a system problem occurs outside of regular working hours, it will not be
fixed until the following work day.
WARNING: The data are processed in near real-time,
have not been fully validated, and are preliminary.
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