Chlorophyll-a and suspended matter concentration, yellow substance absorption at 440 nm and Secchi depth in the Namibian upwelling region during METEOR cruise M103/1

The chlorophyll-a concentration was measured using the standard method of in vitro fluorescence according to the monitoring programme of HELCOM (Helsinki Commission).
The suspended matter concentration (SPM) was determined according to the ESA validation protocols (Doerffer 2002). Before filtration, the Whatman GFF filters were washed, glowed and weighted. The water samples were filtrated using the pre-treated filters. After filtration, the filters were washed with Milli-Q water, dried at a temperature of 70°C and weighted. […]