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The intensity of sunlight, or irradiance, is an important factor for primary production in the ocean. Irradiance is measured in photons arriving per square meter per second, and varies depending on the time of day, the season, and weather conditions. The photic zone is that portion of the ocean that receives sunlight. Only low levels of light reach the deeper layers of the ocean because most of the light is absorbed by algae just below the surface and as depth increases light is absorbed by the water itself. When fewer algae are present, the photic zone extends deeper. The depth of the photic zone can also be affected by seasonal mixing of ocean waters. In the spring, for example, deep water is circulated toward the surface reducing sunlight penetration due to suspension of particles from the bottom. Most primary production occurs within a depth of 200 m.

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Q: Why is it dark at the bottom of the ocean even though water is transparent?
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Related questions

Where is the coldest water in the ocean?

The coldest water in the ocean is the bottom of the ocean.


Is water a transparent object?

Yes its blue in the ocean because of the particles floating around and the ocean. Water is clear by itself


Is there air on the bottom of the ocean?

No. There is water at the bottom of the ocean. There is oxygen in the water that a fish can breath in through it's gills.


Is the titanic still in the bottom of the ocean or has it been lifted out of the water?

The Titanic is still at the bottom of the ocean.


Why is there fresh water at the bottom of the ocean?

There are fresh water lakes


Where can light not travel?

Through solid matter and certain other things in the other phases.Answer:Visible light cannot travel through opaque materials. However enough thickness of any material can eventually block out light. As an example, even though sea water is transparent, the bottom of the deep ocean is dark as light is incapable of reaching through miles of water


Where would a anchovy live?

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The arrangement of water masses in the southern Atlantic Ocean from the surface to the bottom is?

The arrangement of water masses in the southern Atlantic Ocean from the surface to the bottom is Antarctic Intermediate water, north Atlantic deep water, and the Antarctic bottom water. The location where water flow uninterrupted between the Pacific, the Atlantic, and the Indian Oceans is in the southern ocean.


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When the water is in tumbler it is transparent then why is it blue in color when it forms an ocean or a sea?

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Where in the ocean is water pressure the greatest?

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