(Table 1) Salinity and dissolved organic carbon concentration of marine water (ANT-XIX/2) and mangrove porewater (Brazil) ...

• Main Authors: Koch, Boris P, Witt, Matthias, Engbrodt, Ralph, Dittmar, Thorsten, Kattner, Gerhard
• Format: Dataset
• Language: English
• Published: PANGAEA 2005
• Subjects: AWI; Event label; Date/Time of event; Latitude of event; Longitude of event; Station label; Sample type; DEPTH, water; Salinity; Carbon, organic, dissolved; Percentage; Water sample; CTD, Seabird; High temperature catalytic oxidation; ANT-XIX/2; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarctic; Arctic; Weddell; Weddell Sea; Antarc*; Antarctica; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.848469; https://doi.pangaea.de/10.1594/PANGAEA.848469

The chemical structure of refractory marine dissolved organic matter (DOM) is still largely unknown. Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR-MS) was used to resolve the complex mixtures of DOM and provide valuable information on elemental compositions on a molecular scale. We characterized and compared DOM from two sharply contrasting aquatic environments, algal-derived DOM from the Weddell Sea (Antarctica) and terrigenous DOM from pore water of a tropical mangrove area in northern Brazil. Several thousand molecular formulas in the mass range of 300-600 Da were identified and reproduced in element ratio plots. On the basis of molecular elemental composition and double-bond equivalents (DBE) we calculated an average composition for marine DOM. O/C ratios in the marine samples were lower (0.36 ± 0.01) than in the mangrove pore-water sample (0.42). A small proportion of chemical formulas with higher molecular mass in the marine samples were characterized ... : Supplement to: Koch, Boris P; Witt, Matthias; Engbrodt, Ralph; Dittmar, Thorsten; Kattner, Gerhard (2005): Molecular formulae of marine and terrigenous dissolved organic matter detected by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. Geochimica et Cosmochimica Acta, 69(13), 3299-3308 ...