Lake Chad chlorophyll concentration

This image shows the chlorophyll concentration of Africa’s Lake Chad as derived from the Medium Resolution Imaging Spectrometer (MERIS) instrument aboard the Envisat satellite in November 2007. Chlorophyll concentration is closely related to the re-filling of lakes in early November. Fresh water is coming in from the south through the Chari River, reducing the Chlorophyll levels in the lake from south to north.