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Environment Canada
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The Canadian Ozone and Ultraviolet Measurement Program

Most Recent Observations at Canadian Brewer Stations

Other Related Observations

Observation Network

Map of Canadian ozone observation network.  Click on map for larger one
Name Latitude
(North)
Longitude
(West)
Total Ozone Instruments Other Instrumentation
Alert 82.50 62.30 Brewer (1989) Ozonesonde (1987)
Churchill 58.75 94.00 Brewer (Dobson 1964) Ozonesonde (1973)
Edmonton (Stony Plain) 53.55 114.10 Brewer (Dobson 1957) Ozonesonde (1970)
Egbert 44.23 79.78   Ozonesonde (2003), Lidars, FTIR spectrometers
Eureka 80.05 86.43 Brewer (1992) Ozonesonde (1992), lidars, FTIR spectrometers, other
Goose Bay 53.32 60.30 Brewer (Dobson 1962) Ozonesonde (1969)
Halifax (Dartmouth) 44.73 63.66 Brewer (1992-2005)  
Kelowna 49.93 119.4   Ozonesonde (2003)
Mauna Loa (Hawaii, U.S.A.) 19.53 155.58 Brewer (1997)  
Montreal (YUL) 45.47 73.75 Brewer (1993-2005)  
Regina (Bratt's Lake) 50.21 104.67 Brewer (1994) Ozonesonde (2003)
Resolute Bay 74.72 94.98 Brewer (Dobson 1957) Ozonesonde (1966)
Saskatoon 52.11 106.71 Brewer (1998-2002)  
Saturna Island 48.78 123.13 Brewer (1990)  
Toronto (Downsview) 43.78 79.47 Brewer (Dobson 1960)  
Winnipeg 49.91 97.24 Brewer (1992-2004)  
Yarmouth 43.87 66.11   Ozonesonde (2003)

Dates indicate the start of regular observations.

Current state at the stations

To select the most recent graph choose a station and type and click on the icon. To see plots for all stations click on the icon in the last row. The year-to-date images are normally updated daily at 1400 UTC. Today's plots are updated every hour between 1400 and 2300 UTC. Previous years images are contained in an archive accessible by FTP.

WARNING: The data are processed in near real-time, have not been fully validated, and are preliminary.


NOTE: This near-real-time system is automated. If a system problem occurs outside of regular working hours, it will not be fixed until the following work day.

Name Year-
to-
Date Total ozone Graphs
Year-
to-
Date Max. UV Index Graphs
Year-
to-
Date UV Index Plots
Year-
to-
Date Ozone-
sonde Plots
Today's UV Index Plots Current View
Land Sky
Alert       Click for Alert ytd ozonesonde ytd graph     Click for current photo of sky at Alert site
Churchill Click for Churchill ytd total ozone graph Click for Churchill ytd daily maximum UV graph Click for Churchill ytd UV graph Click for Churchill ytd ozonesonde ytd graph Click for Churchill daily UV graph   {Click for current photo of sky at Churchill pour la photo actuelle du ciel au site à Churchill}
Edmonton Click for Edmonton ytd total ozone graph Click for Edmonton ytd daily maximum UV graph Click for Edmonton ytd UV graph Click for Edmonton ytd ozonesonde ytd graph Click for Edmonton daily UV graph Click for current photo of Edmonton/Stony Plain site Click for current photo of sky at Edmonton/Stony Plain site
Egbert       Click for Egbert ytd ozonesonde ytd graph     Click for current photo of sky at Egbert (CARE) site
Eureka Click for Eureka ytd total ozone graph Click for Eureka ytd daily maximum UV graph Click for Eureka ytd UV graph Click for Eureka ytd ozonesonde ytd graph Click for Eureka daily UV graph    
Goose Bay Click for Goose Bay ytd total ozone graph Click for Goose Bay ytd daily maximum UV graph Click for Goose Bay ytd UV graph Click for Goose Bay ytd ozonesonde ytd graph Click for Goose Bay daily UV graph Click for current photo of Goose Bay site Click for current photo of sky at Goose Bay site
Kelowna       Click for Kelowna ytd ozonesonde ytd graph      
Mauna Loa         Click for Mauna Loa daily UV graph Click for current photo of Mauna Loa site Click for current photo of sky at Mauna Loa site
Regina Click for Regina ytd total ozone graph graph Click for Regina ytd daily maximum UV graph Click for Regina ytd UV graph Click for Regina ytd ozonesonde ytd graph Click for Regina daily UV graph   Click for current photo of sky at Regina site
Resolute Bay Click for Resolute ytd total ozone graph Click for Resolute ytd daily maximum UV graph Click for Resolute ytd UV graph Click for Resolute ytd ozonesonde ytd graph Click for Resolute daily UV graph   Click for current photo of sky at Resolute site
Saturna Island Click for Saturna Island ytd total ozone graph Click for Saturna Island ytd daily maximum UV graph Click for Saturna Island ytd UV graph   Click for Saturna Island daily UV graph   Click for current photo of sky at Saturna Island site
Toronto Click for Toronto ytd total ozone graph Click for Toronto ytd daily maximum UV graph Click for Toronto ytd UV graph   Click for Toronto daily UV graph Click for current photo of Toronto site Click for current photo of sky at Toronto site
Yarmouth       Click for Yarmouth ytd ozonesonde ytd graph      
All Stations Click for all ytd total ozone graphs, plus explanation Click for all ytd daily maximum UV graphs, plus explanation Click for all ytd UV graphs, plus explanation Click for all ytd ozonesonde graphs, plus explanation Click for all daily UV graphs, plus explanation    

Current View

The pictures show current sky and instrument images taken in 10 (sky) or 30 (instrument) minute intervals at different sites. The pictures from Mauna Loa observatory are provided by the Climate Monitoring and Diagnostics Laboratory (CMDL) of the National Oceanic and Atmospheric Administration.

The times shown at the bottom of each photo are UTC (Coordinated Universal Time, GMT)

Year-to-Date Total Ozone Time Series Graphs

The graphs show daily mean total ozone values (in Dobson Units) as a function of the season over Canadian stations for the current year up to yesterday. The results of most accurate Brewer direct sun measurements are shown in red, all other types of data are shown in blue. The green line indicates total ozone values smoothed by one month running mean. The dashed lines represent “normal”, pre-1980 total ozone annual cycle and two standard deviations envelope for daily mean total ozone. The actual data are available (typically, with one month delay) from the World Ozone and Ultraviolet Radiation Data Center (WOUDC).

Year-to-Date Daily Maximum UV Index

The UV index plots are based on ground-based measurements by Brewer spectrophotometers carried out by the Science and Technology Branch. The actual measurements are indicated by the cyan dots. Estimates of UV Index for clear sky no-snow conditions and “normal” pre-1980 total ozone values are shown by the blue line. Estimates of UV Index for clear sky no-snow conditions and each day's total ozone values are shown by the magenta line. The time is shown as both local (in a time zone) and solar (the sun is in its highest position over the horizon exactly at noon).

Year-to-Date UV Index Plots

The plots show the measured by Brewer spectrophotometers UV index values as a function of the season and the time of the day over Canadian stations for the current year up to yesterday. The time is shown as a solar time, i.e. the sun is in its highest position over the horizon exactly at noon. The gray areas indicate periods with no observations. The actual spectral UV data are available (with some delay) from the World Ozone and Ultraviolet Radiation Data Center (WOUDC). UV Index forecast for selected Canadian cities is available from the Canadian Meteorological Centre (CMC).

Year-to-Date Ozonesonde Profiles

This section contains plots of the time-altitude cross-section of the ozone partial pressure measured by ECC ozonesondes at 10 Canadian stations. Ozone partial pressure is given in nanobars. The actual data are available (typically, with one month delay) from the World Ozone and Ultraviolet Radiation Data Center (WOUDC).

Today's UV Index Plots

The UV index plots are based on ground-based measurements by Brewer spectrophotometers carried out by the Science and Technology Branch. The actual measurements are indicated by red dots and the red line. Estimates of UV Index for clear sky no-snow conditions and “normal” pre-1980 total ozone values are shown by the blue line. Estimates of UV Index for clear sky no-snow conditions and today's total ozone values are shown by the magenta line. If today's total ozone is normal the magenta line will cover the blue line. The time is shown as both local (in a time zone) and solar (the sun is in its highest position over the horizon exactly at noon). The plots are updated every five minutes. You need to click on “Refresh” to see the updates.

Data

Data are collected and, after passing quality control, submitted to the World Ozone and Ultraviolet Radiation Data Centre (WOUDC). Preliminary data are posted and can be obtained via FTP: ozone data and UV data.

They can be seen in graphical form. Like the data, the formatting of the pages is preliminary.

Ozone data graphs

links to daily graphs, or the most recent seven days.

UV data graphs,

UV data. Each graph shows an entire year at one station.