text:  The mission is studying how the oceans and atmosphere interact, tracking their health, charting marine resources, and more. And ocean color plays a big role in all of that. The water can be tinted by tiny organisms known as phytoplankton. Some of them turn the water green, a result of the chlorophyll they use to convert sunlight to energy. Plankton attract fish and other large animals, so keeping an eye on the color can help scientists track the health of fisheries.