Late spring and summer weather brings blooms of color to the Atlantic Ocean off of South America, at least from a satellite view. The Patagonian Shelf Break is a biologically rich patch of ocean where airborne dust from the land, iron-rich currents from the south, and upwelling currents from the depths provide a bounty of nutrients for the grass of the sea   phytoplankton. In turn, those floating sunlight harvesters become food for some of the richest fisheries in the world.