Urban Heat Island
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Thermal inertia plays an important role in the urban heat island effect. Materials with high thermal inertia, such as concrete and sand, absorb and store heat during the day, preventing cities from cooling off as quickly as surrounding rural areas at night. The use of remote sensing allows scientists to measure surface temperatures and better understand differences between urban and rural environments. Understanding factors like albedo, moisture, vegetation, and thermal inertia is key to analyzing and mitigating the urban heat island effect.
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www.bio4climate.org
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Urban Heat Island
- 1. Urban Heat Island The Role of Thermal Inertia http://pdphoto.org/PictureDetail.php?pg=7954&mat=pdef
- 2. What Is “Urban Heat Island”? http://eetd.lbl.gov/HeatIsland/HighTemps/
- 3. Important Factors Albedo • Tells us lighter objects reflect more incoming radiation than darker objects (from Christopherson, 2004) Moisture and Vegetation • Parks and agricultural fields reduce urban heat island through evaporative cooling
- 4. Some More Terms: 1) Thermal Inertia – The potential of a material to absorb and store heat 2) Oasis Effect – Where cities can be cooler during the day than the surrounding countryside 3) Remote Sensing – Involves the acquisition of earth surface characteristics using a remote device
- 6. What Do You Think Will Be Hotter, the Sand or the Concrete? Infrared Thermometer (Our Remote Sensor)
- 7. An Example Beyond Urban Heat Island: Using Thermal Inertia to Better Understand Mars (Images Courtesy of NASA) Warm Cool Cool Warm “Day” “Night”
- 8. Charlie’s Angels and Thermal Inertia Cool Warm Cool Warm “Day” “Night”
- 9. Nighttime Phoenix A_____ 10:39pm 10/3/03 B_____ Analysis: Use your knowledge of greater Phoenix and urban heat island to decipher what each of these letters are referring to. C_____ D_____ (http://elwood.la.asu.edu/grsl/UEM/)
- 10. How Does Phoenix Compare? (image courtesy of NASA)
- 11. What kinds of problems might stem from urban heat island, if any?
- 12. Things to know: • What is Urban Heat Island? • How does albedo, moisture, and vegetation play • a role in urban heat island? Understand and describe Thermal Inertia, Oasis Effect, and Remote Sensing and how they relate to urban heat island. Help: Chapter AT