Question

Which part of Earth most likely has the highest albedo value?

smooth ocean ice when the Sun is at a 30-degree angle
smooth ocean ice when the Sun is at a 15-degree angle
choppy ocean water when the Sun is at a 30-degree angle
choppy ocean water when the Sun is at a 15-degree angle

Answer 1

Smooth ocean ice when the Sun is at a 15-degree angle.

Reason: ice is much more reflective than open water, and reflectance increases at low sun angles (more grazing incidence leads to greater reflected fraction), so smooth ice with the Sun low on the horizon gives the highest albedo.