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Koch, Boris P; Witt, Matthias; Engbrodt, Ralph; Dittmar, Thorsten; Kattner, Gerhard (2005): (Table 1) Salinity and dissolved organic carbon concentration of marine water (ANT-XIX/2) and mangrove porewater (Brazil). PANGAEA,, Supplement to: Koch, BP et al. (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,

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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 by very low O/C and H/C ratios probably reflecting amphiphilic properties. The average number of unsaturations in the marine samples was surprisingly high (DBE = 9.9; mangrove pore water: DBE = 9.4) most likely due to a significant contribution of carbonyl carbon. There was no significant difference in elemental composition between surface and deep-water DOM in the Weddell Sea. Although there were some molecules with unique marine elemental composition, there was a conspicuous degree of similarity between the terrigenous and algal-derived end members. Approximately one third of the molecular formulas were present in all marine as well as in the mangrove samples. We infer that different forms of microbial degradation ultimately lead to similar structural features that are intrinsically refractory, independent of the source of the organic matter and the environmental conditions where degradation took place.
German Science Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Median Latitude: -51.877075 * Median Longitude: -31.695225 * South-bound Latitude: -69.003800 * West-bound Longitude: -47.890000 * North-bound Latitude: -0.899000 * East-bound Longitude: -3.699500
Date/Time Start: 2001-12-28T11:00:00 * Date/Time End: 2002-01-05T18:58:00
Minimum DEPTH, water: 30 m * Maximum DEPTH, water: 4600 m
Caete_mangr * Latitude: -0.899000 * Longitude: -46.700000 * Location: Equatorial West Atlantic * Method/Device: Water sample (WS)
PS61/024-1 * Latitude: -68.612700 * Longitude: -3.699500 * Date/Time: 2001-12-28T11:00:00 * Elevation: -3826.0 m * Location: Weddell Sea * Campaign: ANT-XIX/2 (PS61) * Basis: Polarstern * Method/Device: CTD, Seabird (CTD-R)
PS61/027-1 * Latitude: -69.003800 * Longitude: -28.491400 * Date/Time: 2001-12-31T11:45:00 * Elevation: -4676.0 m * Location: Weddell Sea * Campaign: ANT-XIX/2 (PS61) * Basis: Polarstern * Method/Device: CTD, Seabird (CTD-R)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventKoch, Boris P
2Date/Time of eventDate/TimeKoch, Boris P
3Latitude of eventLatitudeKoch, Boris P
4Longitude of eventLongitudeKoch, Boris P
5Station labelStationKoch, Boris P
6Sample typeSamp typeKoch, Boris P
7DEPTH, waterDepth watermKoch, Boris PGeocode
8SalinitySalKoch, Boris P
9Carbon, organic, dissolvedDOCµmol/lKoch, Boris PHigh temperature catalytic oxidation
10PercentagePerc%Koch, Boris Pcarbon extraction efficiency
35 data points

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