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  • PANGAEA  (4)
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  • 1
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    PANGAEA
    In:  Supplement to: Kellerman, Anne M; Kothawala, Dolly N; Dittmar, Thorsten; Tranvik, Lars J (2015): Persistence of dissolved organic matter in lakes related to its molecular characteristics. Nature Geoscience, 8, 454-457, https://doi.org/10.1038/ngeo2440
    Publication Date: 2023-01-13
    Description: Whether intrinsic molecular properties or extrinsic factors such as environmental conditions control the decomposition of natural organic matter across soil, marine and freshwater systems has been subject to debate. Comprehensive evaluations of the controls that molecular structure exerts on organic matter's persistence in the environment have been precluded by organic matter's extreme complexity. Here we examine dissolved organic matter from 109 Swedish lakes using ultrahigh-resolution mass spectrometry and optical spectroscopy to investigate the constraints on its persistence in the environment. We find that degradation processes preferentially remove oxidized, aromatic compounds, whereas reduced, aliphatic and N-containing compounds are either resistant to degradation or tightly cycled and thus persist in aquatic systems. The patterns we observe for individual molecules are consistent with our measurements of emergent bulk characteristics of organic matter at wide geographic and temporal scales, as reflected by optical properties. We conclude that intrinsic molecular properties are an important control of overall organic matter reactivity.
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2023-01-13
    Keywords: Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS); Hydrogen/Carbon ratio; Mass-to-charge ratio; Molecular formula; Oxygen/Carbon ratio; Peak intensity
    Type: Dataset
    Format: text/tab-separated-values, 330846 data points
    Location Call Number Limitation Availability
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  • 3
    Publication Date: 2023-01-13
    Keywords: Absorption; Aromaticity index; Biological index; Calculated; Carbon, nominal oxidation state; Carbon, organic, dissolved; Date/Time of event; DEPTH, water; Event label; Fluorescence index; Fluorescence intensity; Humification index; Hydrogen/Carbon ratio; Identification; Intensity; LAKE; Latitude 2; Latitude of event; Longitude 2; Longitude of event; Mass-to-charge ratio; Nitrogen, number of atoms; Nitrogen, organic, dissolved; Nitrogen/Carbon ratio; Oxygen/Carbon ratio; Parallel factor analysis (PARAFAC); Sampling lake; Slope; Specific ultraviolet absorbance per mass Carbon; Sulfur, number of atoms; Sweden; Sweden_Lake1; Sweden_Lake10; Sweden_Lake100; Sweden_Lake101; Sweden_Lake102; Sweden_Lake103; Sweden_Lake104; Sweden_Lake106; Sweden_Lake107; Sweden_Lake108; Sweden_Lake109; Sweden_Lake11; Sweden_Lake110; Sweden_Lake111; Sweden_Lake112; Sweden_Lake114; Sweden_Lake115; Sweden_Lake118; Sweden_Lake12; Sweden_Lake122; Sweden_Lake123; Sweden_Lake124; Sweden_Lake125; Sweden_Lake126; Sweden_Lake127; Sweden_Lake128; Sweden_Lake129; Sweden_Lake13; Sweden_Lake130; Sweden_Lake131; Sweden_Lake132; Sweden_Lake133; Sweden_Lake134; Sweden_Lake135; Sweden_Lake136; Sweden_Lake137; Sweden_Lake138; Sweden_Lake139; Sweden_Lake14; Sweden_Lake140; Sweden_Lake141; Sweden_Lake142; Sweden_Lake143; Sweden_Lake144; Sweden_Lake145; Sweden_Lake146; Sweden_Lake147; Sweden_Lake148; Sweden_Lake149; Sweden_Lake15; Sweden_Lake150; Sweden_Lake16; Sweden_Lake17; Sweden_Lake18; Sweden_Lake19; Sweden_Lake2; Sweden_Lake22; Sweden_Lake23; Sweden_Lake24; Sweden_Lake25; Sweden_Lake26; Sweden_Lake27; Sweden_Lake28; Sweden_Lake29; Sweden_Lake3; Sweden_Lake30; Sweden_Lake33; Sweden_Lake36; Sweden_Lake38; Sweden_Lake39; Sweden_Lake4; Sweden_Lake40; Sweden_Lake41; Sweden_Lake42; Sweden_Lake43; Sweden_Lake44; Sweden_Lake45; Sweden_Lake46; Sweden_Lake47; Sweden_Lake49; Sweden_Lake5; Sweden_Lake50; Sweden_Lake55; Sweden_Lake6; Sweden_Lake70; Sweden_Lake71; Sweden_Lake72; Sweden_Lake73; Sweden_Lake74; Sweden_Lake75; Sweden_Lake76; Sweden_Lake77; Sweden_Lake78; Sweden_Lake79; Sweden_Lake80; Sweden_Lake81; Sweden_Lake82; Sweden_Lake83; Sweden_Lake84; Sweden_Lake85; Sweden_Lake86; Sweden_Lake87; Sweden_Lake88; Sweden_Lake89; Sweden_Lake90; Sweden_Lake91; Sweden_Lake92; Sweden_Lake93; Sweden_Lake94; Sweden_Lake95; Sweden_Lake97; Sweden_Lake98; Sweden_Lake99; Weighted average
    Type: Dataset
    Format: text/tab-separated-values, 3724 data points
    Location Call Number Limitation Availability
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  • 4
    Publication Date: 2023-10-28
    Description: The outflow of Leverett Glacier, a large land-terminating glacier of the Greenland Ice Sheet was sampled over the 2015 ablation season. Dissolved organic carbon (DOC) concentrations, dissolved organic matter (DOM) fluorescence, and hydrogeochemical data (e.g. discharge, specific conductivity, pH, and turbidity) were analyzed to assess changing DOM sources over the melt season. DOC concentrations and red-shifted fluorescence suggest terrestrial inputs from overridden soils dominated DOM early season inputs before progressive dilution with increasing discharge. During the outburst period, supraglacial drainage events disrupted the subglacial drainage system and introduced dominant protein-like fluorescence signatures not observed in basal flow. These results suggest that subglacial hydrology and changing water sources influence exported DOC concentration and DOM composition, differentiated through fluorescence characteristics. The outburst and post-outburst periods were characterized by protein-like fluorescence from supraglacial and potentially subglacial microbial sources.
    Keywords: Campbell Scientific 247-L Conductivity and Temperature Probe; Carbon, organic, dissolved; Carbon, organic, dissolved load; Conductivity; DATE/TIME; Day of the year; Dissolved Organic Matter; DOM; Event label; Flow rate; Fluorescence; Fluorescence, dissolved organic matter, at 317 nm wavelength; Fluorescence, dissolved organic matter, at 368 nm wavelength; Fluorescence, dissolved organic matter, at 416 nm wavelength; Fluorescence, dissolved organic matter, at 425 nm wavelength; Fluorescence, dissolved organic matter, at 483 nm wavelength; Fluorescence spectrometer, AquaLog, HORIBA JobinYvon; glaciers; Greenland; Honeywell Durafet pH sensors; Lachat QuickChem 8500 flow injection autoanalyser; L Atalante; Leverett_glacier_basal_ice; Leverett_glacier_snow; Leverett_glacier_time_series; Nitrogen in nitrate; PARAFAC; Period; pH; Phosphorus in orthophosphate; Pressure transducer, HOBO; Roorkee Industries Suspended Sediment Sampler USDH-48; Shimadzu TOC-L total organic carbon analyzer; SNOW; Snow/ice sample; Suspended particulate matter; Thermo Scientific Dionex IonPac AS11-HC-4μm Anion-Exchange Column fitted to a Thermo Scientific Dionex ICS-5000 Ion Chromatography; ZAIROV
    Type: Dataset
    Format: text/tab-separated-values, 785 data points
    Location Call Number Limitation Availability
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