#ocean-optics

2 articles

Water Clarity and Light: How Far Down Kelp Can Grow

Light is kelp's only real ceiling. How seawater absorbs and scatters sunlight, what sets kelp's depth limit, and why water clarity is a restoration variable.

Dr. Lena Fischer · September 26, 2026

Science11 min read

Light Underwater: Why Depth and Colour Decide Where Kelp Grows

Seawater filters sunlight within metres — reds vanish first, blues travel deepest. How underwater light sets the depth limits, seasons and colour of the world's kelp forests.

Dr. Lena Fischer · September 20, 2026

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