CHLOROPHYLL-a CONCENTRATION AND ANOMALY. Below, on the left-hand side, there is the mass concentration of chlorophyll-a in sea water [mg/m3] from the Atlantic Ocean Colour Bio-Geo-Chemical L4 Satellite Observations (https://doi.org/10.48670/moi-00288). On the right-hand side, there is the chlorophyll-a anomaly determined as the difference between the actual chlorophyll-a concentration and a 60-day running median, ending two weeks before the current image (Tomlinson et al., 2004).