十万个为什么·科学启蒙30篇（4）
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Why Deep Ocean Light Fades Rapidly
为什么深海颜色迅速变暗
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Sunlight contains all colors, but water absorbs longer wavelengths—red, orange, yellow—first, within the top 50 meters.
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By 100 meters, green light dominates; at 200 meters, only dim blue remains, and infrared vanishes completely.
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Particles and dissolved organic matter scatter light further, reducing clarity and intensity faster in coastal zones.
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Most deep-sea animals either produce their own light (bioluminescence) or have ultra-sensitive eyes adapted to near-total darkness.
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Submersibles carry powerful lights because natural illumination drops to less than 1% of surface levels below 200 m.
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Photosynthetic organisms like phytoplankton vanish below 1000 meters, where no usable light remains for energy conversion.
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Scientists use spectral sensors to map ‘euphotic depth’—the deepest layer receiving enough light for photosynthesis.
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This rapid attenuation is why deep-ocean photography requires artificial lighting and careful white-balance calibration.