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Sunlight Penetration in Lake Superior

The depth to which sunlight penetrates in Lake Superior, varying by wavelength and water conditions.

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Jan 24, 2026
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how far does sunlight penetrate into Lake Superior

in is wavelength-dependent: long wavelengths like red are absorbed within tens of meters (reported as less than ~50 m), while blue and green light commonly penetrate beyond 100 m in clear open-water c...

Jan 24, 2026

at what depth in Lake Superior does the water appear black to the human eye

’s water does not suddenly turn “black” at a single universal depth; instead, human perception of blackness is governed by how far and by local —average underwater visibility in Lake Superior is repor...