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Gonçalves-Araujo, Rafael; Stedmon, Colin A; Heim, Birgit; Dubinenkov, Ivan; Kraberg, Alexandra C; Moiseev, Denis; Bracher, Astrid (2015): Dissolved organic matter in the Lena River Delta Region, Siberia, Russia. PANGAEA,, Supplement to: Gonçalves-Araujo, R et al. (2015): From fresh to marine waters: characterization and fate of dissolved organic matter in the Lena River delta region, Siberia. Frontiers in Marine Science, 2(108), 13 pp,

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Connectivity between the terrestrial and marine environment in the Artic is changing as a result of climate change, influencing both freshwater budgets and the supply of carbon to the sea. This study characterizes the optical properties of dissolved organic matter (DOM) within the Lena Delta region and evaluates the behavior of DOM across the fresh water-marine gradient. Six fluorescent components (four humic-like; one marine humic-like; one protein-like) were identified by Parallel Factor Analysis (PARAFAC) with a clear dominance of allochthonous humic-like signals. Colored DOM (CDOM) and dissolved organic carbon (DOC) were highly correlated and had their distribution coupled with hydrographical conditions. Higher DOM concentration and degree of humification were associated with the low salinity waters of the Lena River. Values decreased towards the higher salinity Laptev Sea shelf waters. Results demonstrate different responses of DOM mixing in relation to the vertical structure of the water column, as reflecting the hydrographical dynamics in the region. Two mixing curves for DOM were apparent. In surface waters above the pycnocline there was a sharper decrease in DOM concentration in relation to salinity indicating removal. In the bottom water layer the DOM decrease within salinity was less. We propose there is a removal of DOM occurring primarily at the surface layer, which is likely driven by photodegradation and flocculation.
Median Latitude: 72.903263 * Median Longitude: 129.893444 * South-bound Latitude: 71.739800 * West-bound Longitude: 127.316470 * North-bound Latitude: 74.060640 * East-bound Longitude: 132.466220
Date/Time Start: 2013-09-01T11:22:00 * Date/Time End: 2013-09-06T19:20:00
Minimum DEPTH, water: 0.0 m * Maximum DEPTH, water: 28.0 m
T1-1301 * Latitude: 71.739800 * Longitude: 129.722200 * Date/Time: 2013-09-01T15:30:00 * Elevation: -4.0 m * Campaign: Lena2013 (RU-Land_2013_Lena) * Basis: AWI Arctic Land Expedition * Method/Device: Multiple investigations (MULT)
T1-1302 * Latitude: 71.741470 * Longitude: 129.837060 * Date/Time: 2013-09-01T18:01:00 * Elevation: -6.0 m * Location: Laptev Sea * Campaign: Lena2013 (RU-Land_2013_Lena) * Basis: AWI Arctic Land Expedition * Method/Device: Multiple investigations (MULT)
T1-1303 * Latitude: 71.777220 * Longitude: 130.088000 * Date/Time: 2013-09-01T11:22:00 * Elevation: -12.0 m * Location: Laptev Sea * Campaign: Lena2013 (RU-Land_2013_Lena) * Basis: AWI Arctic Land Expedition * Method/Device: Multiple investigations (MULT)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Date/Time of eventDate/Time
3Latitude of eventLatitude
4Longitude of eventLongitude
5Elevation of eventElevationm
6DEPTH, waterDepth watermGeocode
7Temperature, waterTemp°CGonçalves-Araujo, Rafael
8SalinitySalGonçalves-Araujo, Rafael
9Fluorescence, intensity, maximum, DOMFmax1/nmGonçalves-Araujo, Rafaeltotal
10Fluorescence, intensity, maximum, DOMFmax1/nmGonçalves-Araujo, RafaelComponent 1
11Fluorescence, intensity, maximum, DOMFmax1/nmGonçalves-Araujo, RafaelComponent 2
12Fluorescence, intensity, maximum, DOMFmax1/nmGonçalves-Araujo, RafaelComponent 3
13Fluorescence, intensity, maximum, DOMFmax1/nmGonçalves-Araujo, RafaelComponent 4
14Fluorescence, intensity, maximum, DOMFmax1/nmGonçalves-Araujo, RafaelComponent 5
15Fluorescence, intensity, maximum, DOMFmax1/nmGonçalves-Araujo, RafaelComponent 6
16Absorption coefficient, 350 nmac3501/mGonçalves-Araujo, Rafael
17Absorption coefficient, 443 nmac4431/mGonçalves-Araujo, Rafael
18Spectral slope of colored dissolved organic matter absorptionSCDOM1/µmGonçalves-Araujo, Rafael
19RatioRatioGonçalves-Araujo, RafaelS ratio
20Specific ultraviolet absorbance normalized to DOCSUVA norm DOCm2/gGonçalves-Araujo, Rafael
21Humification indexHIXGonçalves-Araujo, Rafael
22Biological indexBIXGonçalves-Araujo, Rafael
23Fluorescence indexFIGonçalves-Araujo, Rafaelf450/f500
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