Greene-Grass wisely entered into a snow removal contract with Stuff-Mart. His advice to the Manager is that, for albedo reasons, the snow will melt more quickly if he leaves it on the ground, rather than plowing it clear to reveal the asphalt. The manager disagrees. He wants Greeme-Grass to plow, arguing the other snow will melt quicker if the asphalt is cleared. Who is telling the truth? Why?

Question

Greene-Grass wisely entered into a snow removal contract with Stuff-Mart. His advice to the Manager is that, for albedo reasons, the snow will melt more quickly if he leaves it on the ground, rather than plowing it clear to reveal the asphalt. The manager disagrees.  He wants Greeme-Grass to plow, arguing the other snow will melt quicker if the asphalt is cleared.  Who is telling the truth?  Why?

BlackTom AI · Accepted Answer

The question concerns how albedo and heat absorption affect snow melt on different surfaces.
Option 1: 'The manager. Dark asphalt has higher albedo.' This is incorrect because dark asphalt actually has a lower albedo, meaning it absorbs more sunlight and heat rather than reflecting it. High albedo (bright surfaces) would reflect more energy and tend to melt snow more slowly.
Option 2: 'The manager. Dark asphalt absorbs heat.' This is the conceptually correct claim: dark surfaces absorb more solar energy, convert it to heat, and can cause nearby snow to melt faster. In albedo terms, lower reflectivity leads to greater heat gain.
Option 3: 'Neither. It makes no difference if he clears the snow or not.' In reality, the surface under the snow matters for heat absorption and melting rate; the color and material can influence how quickly the snow melts, so this option ignores a relevant physical factor.
Option 4: 'Greene-Grass. Snow melts quicker when it covers an entire surface.' This statement misinterprets the physics: snow melt is driven by absorbed heat at the surface; simply being covered across a surface does not inherently make snow melt faster unless that surface is a heat-absorbing one like dark asphalt, and the wording is too broad and misleading to be relied upon.
Option 5: 'Greene-Grass. Snow has lower albedo.' Snow actually has a high albedo compared to dark pavement, meaning it reflects more sunlight; the assertion that snow has lower albedo is factually incorrect and would imply faster melt only if there were other supporting conditions, which this option does not provide.

GEOG 102-PTS1-Online Lab2

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