Tucson’s population grew from about 7500 in the year 1900 to about 520,000 by 2015 (with about 1,000,000 in the surrounding county), and so a portion of the observed temperature increase here may be due to the urban heat island effect. Using your answer in question 2 as a starting point, use the EPA’s upper-end estimate of the UHI effect (5.4°F) to calculate the approximate amount of temperature increase that probably cannot be explained by urbanization. (Note: This answer is based on simplistic assumptions.)

The question is based on Figure 24-6, a chart showing average annual temperature from 1905 to 2015 in three U.S. cities: Nome, Alaska; Bozeman, Montana; and Tucson, Arizona.
What will be an ideal response?


0.6 °F

Environmental & Atmospheric Sciences

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