Résumé
In Algiers Bay, coccolithophore blooms of Holococcolithophora sphaer-oidea species were identified from in situ observations during August 2003, July-August 2013, July 2015, and July 2017. This study determines for the first time in Algiers Bay the episodes of coccolithophore blooms from 2003 to 2018 using satel-lite and in situ observations. In addition, a new coccolithophore remote sensing reflectance index (Cocco-Index) is presented, which aims to detect the presence of coccolithophore bloom from satellites in space and time. It was applied to 16 years of data from the Moderate Resolution Imaging Sensor (2003-2018). From 2003 to 2018, the coccolithophore bloom appeared yearly in Algiers Bay but with a remark-able seasonal variability, developing mainly in winter and rarely in summer. This work is the first demonstration of applying a coccolithophore index for this region over such a large timescale