A while ago, I asked why the water down here in the ocean is so intensely dark blue. Got the answer from Mark & Diana Doyle's "Managing the Waterway - Florida Keys" cruising guide (p. UK-53):
Paraphrasing: These waters are an underwater desert. The water is nutrient-poor, with relatively little planktonic food, so the water is transparent. The water reflects the blue of the sky, but not the green of the planktons, and therefore the water is blue but not blue-green.
And that's why tropical seas are so blue. [Unless someone has a better idea.]
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