Satellite data shows that ocean waters are getting greener at the poles and bluer toward the equator, according to a paper published Thursday in the journal Science by a research team that included Haipeng Zhao, postdoctoral fellow in the School of Earth and Atmospheric Sciences (EAS), and Susan Lozier, College of Sciences Dean, Betsy Middleton and John Clark Sutherland Chair, and EAS professor. 

The change in hue is being caused by shifting concentrations of a green pigment called chlorophyll, which is produced by phytoplankton

The presence of chlorophyll in open ocean is a proxy for concentrations of phytoplankton biomass. The colors indicate how chlorophyll concentration is changing at specific latitudes, in which the subtropics are generally losing chlorophyll, and the polar regions — the high-latitude regions — are greening, the researchers said.

Similar stories appeared at San Francisco Chronicle, Miami Herald, Oceanographic Magazine, Earth.com, and Good Morning America.