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Message: <blockquote data-quote="CorD SaC" data-source="post: 21433047" data-attributes="member: 525096">The reason the ocean is blue is due to the  absorption and scattering of light. 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. Red is absorbed more, and blue is absorbed less, leaving oceans  blue.During confluence, water from two different sources meet. If  there are particles suspended in water, then it would affect the  scattering and absorption process.Ocean water is full of suspended Planktons, What are Plankton?Plankton  (singular plankter) are a diverse group of organisms that live in the  water column and cannot swim against a current.They provide a crucial  source of food to many large aquatic organisms, such as fish and whales.These  organisms include drifting animals, protists, archaea, algae, or  bacteria that inhabit the pelagic zone of oceans, seas, or bodies of  fresh water; that is, plankton are defined by their ecological niche  rather than phylogenetic or taxonomic classification.Indian  ocean and Atlantic ocean belong to two different geographic regions  which means that their temperature, salinity, density, amount of direct  sunlight received completely differ.Here is a image showing plankton concentration through out the world<img src="https://qph.ec.quoracdn.net/main-qimg-10e45bb7eeb1ca178f68a32130418b23" alt="" class="fr-fic fr-dii fr-draggable " style="" />The  most important light-absorbing substance in the oceans is chlorophyll,   due to this green pigment - chlorophyll - phytoplankton preferentially  absorb the red and blue portions of the light spectrum, so the ocean  over regions with high concentrations of phytoplankton will appear as  certain shades, from blue-green to green, depending upon the type and  density of the phytoplankton population there. The confluence does not  actually happen like a horizontal border through out, rather it happens  in pockets.To put in simple words, characteristics of Atlantic  and Indian oceans differ, which gives rise different concentration of  planktons, which in turn absorbs and scatter light in different way  giving rise to different colors of water.Not to be mistaken with river confluence where the color of silt and parent soil material gives rise to color variations.</blockquote>

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