Given adequate sunlight and nutrients, phytoplankton populations can multiply into blooms large enough to be visible from space. That was the case on May 18, 2021, when the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite acquired this natural-color image of a phytoplankton bloom along the coast of New Jersey, Delaware, Maryland, and Virginia.
Some of the nutrients that fueled the bloom likely came from runoff from the Delaware River watershed. Farms, wastewater treatment plants, urban and suburban areas, and other sources all contribute nutrients that can encourage blooms.
Full article at NASA Earth Observatory