Why is ocean water hot at night?

Not much heat moves into the lower levels of the ground. The heat that the ocean absorbs is mixed with the lower water quickly. That mixing spreads the heat around. At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath.



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Not much heat moves into the lower levels of the ground. The heat that the ocean absorbs is mixed with the lower water quickly. That mixing spreads the heat around. At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath.

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Hot Water Beach in the Coromandel in New Zealand has hot water that reaches up to 64 degrees C. It's not the water in the sea, however, but the water that bubbles up through the sand from the geothermal springs.

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With an air temp of 80 degrees Fahrenheit, sand can feel as hot as 110 degrees. With average July temperatures in the 90s, sand can feel hotter than 120 degrees. The lighter the sand, the less heat it holds compared to darker sand. So choose your beach wisely!

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The reason why it happens is that light cannot penetrate the ocean below the midnight or aphotic zone, i.e., 3,280 feet (1,000 meters).

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As the sun sets, fishes, squids, shrimps and zooplankton make massive migrations from the dark ocean depths upward to near the ocean's surface. Despite the small size of some (no bigger than a mosquito), these creatures can travel hundreds of meters in just a few hours.

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Such a minuscule amount of light penetrates beyond a depth of 200 meters that photosynthesis is no longer possible. The aphotic zone exists in depths below 1,000 meters. Sunlight does not penetrate to these depths and the zone is bathed in darkness.

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1. The Maldives. The Maldives, located in the Indian Ocean, have around 1,190 islands and sandbanks. A lagoon with crystal clear water encircles all the islands, which are protected by a reef structure that is home to an array of underwater life.

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