Phytoplankton biomass from the Namibian upwelling system during Maria S. Merain cruise MSM18/4

Geocode DEPTH, water is the mid depth of the range. Phytoplankton counted by means of inverted microscope according to the classical UTERMÖHL method. Counts converted to biomass (wet weight) according to the method described by HELCOM (2010, http://helcom.fi/action-areas/monitoring-and-assessment/manuals-and-guidelines/combine-manual). Principle of the method also described by Olenina et al. (2006, hdl:10013/epic.39031.d001).