Because the waters in tropical areas are nutrient poor. The water is therefor much clearer as there are very little microorganisms. And clear water is blue. Just look at a clear sky, blue, from all the water vapour up there.
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But the culprit for the beautiful blue is the limestone! Limestone is composed primarily of calcium carbonate (CaCO3) and is white in color. As the river breaks down this rock into tiny crystals, these crystals will get mixed up into the water.
Hawaii's ocean water is nutrient deficient. This is common in tropical areas with warm surface water temperatures. A lack of nutrients means there are fewer phytoplankton and algae in Hawaii's water, which makes it more blue.
“So the reason why these beaches are usually dirty is mainly because of their limited water circulation, which leads to prolonged pollution near the shore,” Wu said. “This means the circulation is not enough to flush away all pollution when it happens.
Be it a honeymoon in Bora Bora, a friends-only weekend away in the Bahamas, or a family trip to the Greek Islands, that blue water has us all hooked. But how, exactly, does it get to be that unbelievable hue anyway? The reason the ocean is blue is due to the absorption and scattering of light, NASA explains.
Why Is The Maldives Water So Blue And Clear? Maldives water is known for its abundance of coral reefs. The waters of Maldives are known to consist of coral reefs and “phytoplankton” which absorbs blue and green colours from the sunlight due to which it causes clean water and you can see crystal clear reflection.
The azures, aquas, and turquoises of the shallower depths are what really contribute to the unique Turks and Caicos water and are caused by light reflecting off the white sandy bottoms and off of fine white sand particles that are suspended in the ocean.
The Southern Ocean is not only far-off, but also unambiguously the stormiest region of the planet. Of the sectors of the Southern Ocean, the South Pacific is the most remote — there aren't even islands. It is just this vast stretch of ocean, about 10,000 kilometers between Chile and Australia.
The deeper the water gets, the darker is its tone simply because blue is the only color of sunlight left after all colors were absorbed by the water's molecules. However, another very important biological factor is algae or small microorganisms known as phytoplankton.
The water is clear due to the absence of plankton and suspended particles. Plankton is the base of the food web in all oceans and, because there is little plankton in the tropics, tropical ocean water is nearly sterile in comparison with the fertile waters of the temperate oceans.