Fig. 9: Seasonal cycle of chlorophyll a in the eastern tropical North Atlantic.

a Seasonal cycle of chlorophyll a averaged over a box in the vicinity of the PIRATA buoy (9°N–11.5°N, 23–26°W) for the years 2002–2012. b–d Monthly mean (2002–2012) chlorophyll a distribution for the respective months February, June, and August. The PIRATA buoy position is indicated as cyan star.