Residential Roof Albedos in Albuquerque, New Mexico: Not Adapted for Global Warming?

Albuquerque, New Mexico is the 4th largest city in the U.S. Southwest, with a population of some 560,000 residents. Daytime summer temperatures in the 32-35o C range are common in this high (1500 m) desert setting. At present, the state of New Mexico averages some twenty days each year that are classified as dangerous to the health of its residents. By the year 2050, climate models project that there will be nearly forty such days per year. Current and future summer heat is a particular concern for the health of the 18% of Albuquerque's residents who live below the federal poverty line. Limited finances can prevent such persons from affording proper household cooling, both physically and mentally stressing individuals and families already medically underserved. Roof colors with high albedos can decrease the solar thermal load of residential housing, and also may decrease the urban heat island effect. Using the intersections of a 100-meter grid on satellite images of Albuquerque, we point-counted the color of the underlying roofs. A total of 730 roofs have been counted. Color classification was based on the Munsell Color System. Some 40% were classified as light, i.e., white or light gray, with the remainder darker shades. This does not compare favorably with Tucson's 69% light or Cd. Juarez' (Chihuahua, Mexico) 69%. As we further the project, we will be examining roof color at the neighborhood level to understand possible demographic and socioeconomic factors in choice of roof color.