Photosynthetic pigments by land and sea
Autumn has once again come to eastern North America and, on land, chlorophyll begins to cede its dominance to other pigments in the photosynthetic process, thereby revealing their yellow and orange tones. Meanwhile, in the ocean and lakes, phytoplankton pigments highlight different water masses and current systems.
This image was collected by the MODIS instrument on NASA's Aqua satellite on Oct. 20, 2017. The area shown includes Thunder Bay, Canada, at the top; the Great Lakes; the U.S. East Coast down to Florida.