Fig. 1—Sample “High” is a high concentrated CDOM sample with low salinity collected of a marsh drainage of an urban lake (Lake Pontchartrain) in Mississippi. CDOM sample “Low” is from oligotrophic, low productive waters with high salinity collected at the West coast of Puerto Rico in the Mayaügüez Bay. (Data courtesy of NASA Stennis Space Center).
Fig. 2 – Ponceau S absorption measured with UltraPath (200 cm cell). Ponceau S was dissolved in Millipore water. A single absorbance measurement was made. The signal was neither smoothed nor averaged. Absorbencies are shown on the left ordinate in measured absorbencies [AU] and on the right ordinate in normalized absorbencies [AU/cm].