urban heat islands
DESCRIPTION
Urban Heat Islands. An urban heat island is a metropolitan area which is significantly warmer than its surrounding rural areas. Bare earth and vegetation. Water. Albedo. Buildings and the Ground Store Heat. Sources of Heat. Cityscapes v landscapes. Energy in and out. London, 2000. - PowerPoint PPT PresentationTRANSCRIPT
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Urban Heat Islands
An urban heat island is a metropolitan area which is
significantly warmer than its surrounding rural areas.
![Page 2: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/2.jpg)
Bare earth and vegetation
![Page 3: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/3.jpg)
Water
![Page 4: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/4.jpg)
Albedo
![Page 5: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/5.jpg)
Buildings and the Ground Store Heat
![Page 6: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/6.jpg)
Sources of Heat
![Page 7: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/7.jpg)
Cityscapes v landscapes
![Page 8: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/8.jpg)
Energy in and out
![Page 9: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/9.jpg)
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London, 2000
British Museum
Richmond Park
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London, Summer 2000
Sunrise sunset
![Page 12: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/12.jpg)
Chicago
![Page 13: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/13.jpg)
The urban heat island is biggest…
• At night (before sunrise)
• In the summer
• When there is no wind
• When the sky is clear
• When the weather doesn’t change through the night
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Excess mortality rates in early August 2003 indicate about 40,000 heat-related deaths
Daily mortality in Baden-Württemberg
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observationsHadCM3 Medium-High
2003
2050s
Tem
per
atu
re a
no
mal
y (w
rt 1
961-
90)
°C
European 2003 summer temperatures
“Right now, we average about 14 days each summer above 90
degrees in New York. In a couple of decades, we could be experiencing 30
days or more,”
![Page 16: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/16.jpg)
What’s that got to do with the UHI?
• London – 600 heat related deaths in August 2003
• Up to 9 °C warmer than surrounding rural areas• Mortality increases with temperature when
temperatures are over 22°C• Mortality particularly linked to warm night time
temperatures• Mortality linked to age, sex, deprivation etc.• Challenge now to design buildings and urban
areas for the future – which will see more people living in cities, and will be warmer.
![Page 17: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/17.jpg)
Other Consequences
• The growing season can be up to 15 days longer in a city!
• Warmer in a city in winter
• Rainfall
![Page 18: Urban Heat Islands](https://reader030.vdocuments.us/reader030/viewer/2022032607/5681304c550346895d95f936/html5/thumbnails/18.jpg)
How to reduce urban heat islands