Madagascar bloom (IMAGE) PNAS Nexus Caption Monthly relative anomalies demonstrate the spatial development of chlorophyll-a concentration, a proxy for phytoplankton biomass, during December 2019. Relative anomalies are expressed as the percentage above the monthly climatological mean, relative to the period January 1998–December 2020. Credit Gittings et al Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.