The green turtle is one of the largest sea turtles and the only herbivore among the different species. Sometimes I can get entangled in marine debris like fishing n… Others believe not enough data has been collected to prove global warming is affecting levels of phytoplankton in the seas, which may naturally vary over cycles of 15 years or more. If it stays unused, it will stay perfectly white in colour. Most material © 2005, 1997, 1991 by Penguin Random House LLC. Its range extends throughout tropical and subtropical seas around the world, with two distinct populations in the Atlantic and Pacific Oceans, but it is also found in the Indian Ocean. Sea turtles, manatees and dugongs, also known as herbivorous grazers, graze on the sea grass. So this is why plankton-rich water will look green to us. The blue wavelengths of light are scattered, similar to the scattering of blue light in the sky but absorption is a much larger factor than scattering for the clear ocean water. Because of their place at the base of the marine food web, this can have important knock-on implications across the whole ecosystem. Pure water is of course clear. I received a letter from my aunt in Canada. And that is indeed the gradient we see in the sky. James Joyce described it as snot-green. Surveying the colour of the seas and oceans has also yielded even more significant results. We can’t overstate this: As our world becomes warmer and warmer, our seas will continue to rise. All rights reserved. It is the only species in the genus Chelonia. However, the purity of sea water varies. There was no overall trend. The Red sea and the Black Sea also feed the Mediterranean with water, via the Suez Canal and the Bosphorus Strait, but this exchange is very, very small. The green sea turtle (Chelonia mydas, honu)! But even more important is the biology, because the biggest impact on sea colour is made by tiny organisms called phytoplankton. What is left is either absorbed or scattered within the water. Phytoplankton absorb electromagnetic radiation in the red and blue parts of the visible light spectrum. Create an account and sign in to access this FREE content. The matter is that the green is always there, but it's never there alone. Since then the European Space Agency (Esa), India and South Korea have also launched their own sensors. Scientists may need to monitor the colour of the seas and oceans for more than 40 years. Webster’s New World College Dictionary, 4th Edition. 711k members in the StardewValley community. That is because the phytoplankton contains chlorophyll. These surveys began in 1978 with Nasa's experimental Coastal Zone Color Scanner mission. I eat sea grasses and algae (although juvenile green sea turtles will also eat crabs, sponges and jellyfish), which might be the reason I have the green-colored fat and cartilage that give me my name. For example, scientists have worked out how to spot phytoplankton groups called coccolithophores and diatoms. I don’t know about you, but I’m already salivating at the prospect of Christmas food. These studies have yielded evocative images, including giant tentacles of blues and greens dancing in swirls around each other. Scientists have shown that their populations can double in one day. "This has been verified with data from other sensors, so there's definitely something going on.". Computer algorithms then use this data to estimate how much chlorophyll is in the water below. Light at a short wavelength is also more likely to be scattered or deflected in different directions, including back out of the water towards our eyes, making the sea appear blue. 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