On July 15, 2003, residents of Phoenix who stepped outside around 6 a.m. to walk the dog had an unpleasant greeting: The morning’s low was 96 degrees. It set a record, but it wasn’t a one-day fluke: In 2003, Phoenix tied or broke 57 daily high-temperature records, 38 of them for the highest lows.
While debate rages on about the causes of global warming, no one doubts the source of Phoenix’s morning misery: the urban heat island effect. An Arizona State University study says that temperatures are rising faster in Phoenix than in any comparably sized city in the world. There’s a perfect storm of reasons: Phoenix nests in a bowl-like valley conducive to temperature inversions. It has relatively few shade trees to keep the sun from heating roads, parking lots and sidewalks, which radiate stored solar energy through the night. And the urban area keeps growing exponentially: In 1995 the Arizona Republic calculated that the metro area was expanding into the desert at the rate of an acre an hour. Most of that expansion is new subdivisions of tightly-packed houses with fashionable red concrete tile roofs—excellent collectors and radiators of solar energy.
Belatedly, Phoenix is beginning to worry that its worsening climate will affect its reputation for livability and frighten tourists away. The city is studying ideas such as lighter-colored pavement and roof materials that reflect more energy than they absorb. But mitigating measures look like way too little, too late. That ASU study predicts that Phoenix’s mean daily temperatures are likely to rise another 4.5 degrees by 2100.
I propose a Smithsonian story on the urban heat island effect, focused tightly on Phoenix. I’ll interview climatologists who are studying the worldwide phenomenon, but also literally report at ground level in Phoenix: I’ll go there in July and learn how ordinary people are coping and how it’s affecting their lives.
Although I now live in Seattle, I worked as a journalist in Tucson and Phoenix for 25 years, and much of my work as a freelance writer remains in the Southwest. I’ve successfully dodged summer assignments in Phoenix for the last several years, but this story is important enough to prompt me to volunteer for hazardous duty.
I will be happy to furnish clips and/or references at your request.