uv radiation and the uv index an ontario perspective dave broadhurst environment canada ontario uv...
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![Page 1: UV Radiation and the UV Index An Ontario Perspective Dave Broadhurst Environment Canada Ontario UV Network Conference May 10, 2007](https://reader036.vdocuments.net/reader036/viewer/2022081515/551b37be550346cf5a8b6480/html5/thumbnails/1.jpg)
UV Radiation and the UV Index
An Ontario Perspective
Dave BroadhurstEnvironment Canada
Ontario UV Network ConferenceMay 10, 2007
www.ec.gc.ca
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May 10, 2007 Page 2
Overview
• Factors affecting solar UV radiation
• UV radiation in Ontario
• UV Index and sun protection
• Long term recovery of the ozone layer
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May 10, 2007 Page 3
Spectrum of Solar Radiation
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May 10, 2007 Page 4
Filtering of UVR by the Atmosphere
NASA SOLVE Measurement Campaign
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May 10, 2007 Page 5
Factors that Affect UV Radiation
• Sun angle (latitude, time of day and year)– Toronto January: 1.3; July: 8.7 – Edmonton January: 0.6; July: 7.7– Tropics January: 7.0; July: 14
• Cloud cover• Stratospheric ozone• Altitude• Smog, dust and haze• Reflection and shade
Global Solar UVI http://www.who.int/uv/uv_and_health/en/
Workshop (1995) http://www.phac-aspc.gc.ca/publicat/cdic-mcc/16-1/d_e.html
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May 10, 2007 Page 6
Toronto 2007 Maximum UV Readings
Environment Canada, S&T Branch
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May 10, 2007 Page 7
Winnipeg 2001 Maximum UV Readings
Environment Canada, S&T Branch
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May 10, 2007 Page 8
UV Strength Through the Day
0
1
2
3
4
5
6
7
8
9
6:00AM
7:00AM
8:00AM
9:00AM
10:00AM
11:00AM
12:00PM
1:00PM
2:00PM
3:00PM
4:00PM
5:00PM
6:00PM
7:00PM
8:00PM
9:00PM
Time of Day (EDT)
UV
In
de
x
June or July
April or September
December or January
Typical Readings on Sunny Days in Southern Ontario
Environment Canada
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May 10, 2007 Page 9
The UV Index
• Intensity of sunburning UV radiation
• Values may reach 10 in Ontario (15 in tropics)
• Included in weather forecast when maximum UV predicted to be ≥3 units
• Highest values 11 a.m. to 4 p.m.
• UV exposure = intensity X duration
http://www.msc.ec.gc.ca/topics/uv/
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UV Index – Sun Protection Actions
UVI Category
Sun Protection Actions
0 – 2 Low Minimal protection for normal activity
3 – 5 Moderate Take precautions if outside for ≥30 min
6 - 7 High Protection required. Reduce time in the sun between 11 am and 4 pm, seek shade, cover-up, wear a hat, sunglasses and sunscreen
8 - 10 Very High Take full precautions (see above) and avoid the sun between 11 am and 4 pm
11 + Extreme Very rare in Canada. Unprotected skin will be damaged and can burn in minutes
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Atmospheric Ozone over Canada
Fioletov, Environment Canada
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May 10, 2007 Page 12
Projected Global Ozone Recovery
IPCC, Safeguarding the Ozone Layer, 2005
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May 10, 2007 Page 13
Resources
EC UV Index site http://www.msc.ec.gc.ca/topics/uv/
EC weather forecasts http://weatheroffice.gc.ca/canada_e.html
UV/ozone graphs http://exp-studies.tor.ec.gc.ca/e/ozone/uv_plots.htm
UV Index Poster http://www.msc.ec.gc.ca/topics/uv/uv_health_e.html
UV Index Sun Awareness Program http://www.hc-sc.gc.ca/hl-vs/securit/sports/sun-sol/uv-prog/index_e.html
Skywatcher’s UV Chapter (#6) & activities 20-23 http://www.weatheroffice.pyr.ec.gc.ca/skywatchers/guide_e.html
WMO Scientific Assessment of Ozone Depletion http://esrl.noaa.gov/csd/assessments/2006/
Note: □ in URLs means underscore