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UV Radiation and the UV Index An Ontario Perspective Dave Broadhurst Environment Canada Ontario UV Network Conference May 10, 2007 www.ec.gc.ca.

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Presentation on theme: "UV Radiation and the UV Index An Ontario Perspective Dave Broadhurst Environment Canada Ontario UV Network Conference May 10, 2007 www.ec.gc.ca."— Presentation transcript:

1 UV Radiation and the UV Index An Ontario Perspective Dave Broadhurst Environment Canada Ontario UV Network Conference May 10, 2007

2 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

3 May 10, 2007 Page 3 Spectrum of Solar Radiation

4 May 10, 2007 Page 4 Filtering of UVR by the Atmosphere NASA SOLVE Measurement Campaign

5 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 – EdmontonJanuary: 0.6; July: 7.7 – TropicsJanuary: 7.0; July: 14 Cloud cover Stratospheric ozone Altitude Smog, dust and haze Reflection and shade Global Solar UVI Workshop (1995)

6 May 10, 2007 Page 6 Toronto 2007 Maximum UV Readings Environment Canada, S&T Branch

7 May 10, 2007 Page 7 Winnipeg 2001 Maximum UV Readings Environment Canada, S&T Branch

8 May 10, 2007 Page 8 UV Strength Through the Day Environment Canada

9 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

10 May 10, 2007 Page 10 UV Index – Sun Protection Actions UVICategorySun Protection Actions 0 – 2LowMinimal protection for normal activity 3 – 5ModerateTake precautions if outside for ≥ 30 min 6 - 7HighProtection required. Reduce time in the sun between 11 am and 4 pm, seek shade, cover- up, wear a hat, sunglasses and sunscreen Very HighTake full precautions (see above) and avoid the sun between 11 am and 4 pm 11 +ExtremeVery rare in Canada. Unprotected skin will be damaged and can burn in minutes

11 May 10, 2007 Page 11 Atmospheric Ozone over Canada Fioletov, Environment Canada

12 May 10, 2007 Page 12 Projected Global Ozone Recovery IPCC, Safeguarding the Ozone Layer, 2005

13 May 10, 2007 Page 13 Resources EC UV Index site EC weather forecasts UV/ozone graphs UV Index Poster UV Index Sun Awareness Program vs/securit/sports/sun-sol/uv-prog/index_e.htmlhttp://www.hc-sc.gc.ca/hl- vs/securit/sports/sun-sol/uv-prog/index_e.html Skywatcher’s UV Chapter (#6) & activities WMO Scientific Assessment of Ozone Depletion Note: □ in URLs means underscore

14 May 10, 2007 Page 14 Contact Information (416)


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