Albedo

Consider Farmer Greene-Grass, who owns a section on of land on the margin of a major city. Currently his land is mostly natural grass. He is considering selling out to Stuff Mart, a major retail chain, who will build a combination of retail buildings with dark-coloured tar and gravel rooves, and asphalt parking lots. How would those changes affect the albedo of Greene-Grass’s land?

Question

Albedo

Consider Farmer Greene-Grass, who owns a section on of land on the margin of a major city. Currently his land is mostly natural grass. He is considering selling out to Stuff Mart, a major retail chain, who will build a combination of retail buildings with dark-coloured tar and gravel rooves, and asphalt parking lots. How would those changes affect the albedo of Greene-Grass’s land?

BlackTom AI · Accepted Answer

Let's first lay out what albedo means in this context: it is a measure of how much solar radiation the surface reflects. Higher albedo means a more reflective surface; lower albedo means a more absorbent surface.
Option 1: 'the albedo would decrease' — This is the correct direction of change. Natural grasslands typically reflect more sunlight than dark impervious surfaces like asphalt and dark-roofed buildings. Replacing grass with retail developments featuring dark tar roofs and asphalt parking lots reduces reflectivity, so the albedo drops.
Option 2: 'the albedo would not change' — This ignores the stark contrast in surface properties. Grass is relatively lighter and more reflective than asphalt and dark roofs; converting to built-up, dark surfaces will alter how much light is reflected, making this option inaccurate.
Option 3: 'the albedo would increase' — This is the opposite of what would happen. Darkened roofs and lots absorb more solar energy and reflect less, not more, so albedo would not rise. The change in surface color and material clearly points to a lower reflectivity, not a higher one.

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