Ground Truth Trekking

Dark sky over open water

During the winter, you can tell where there's open water even if it's over the horizon because the sky is darker. In this view from a cliff you can see the effect - dark sky over the water, bright sky over the snowy ice. This is a direct illustration of the concept of albedo - the amount of light something reflects back. It's very relevant in the case of sea ice. Ice reflects sunlight back into space, whereas water absorbs a lot of light.

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By Ground Truth Trekking

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