Fluorescence properties of dissolved organic matter from Leverett Glacier outflow ...

• Main Authors: Kellerman, Anne M, Hawkings, Jon R, Wadham, Jemma, Kohler, Tyler, Stibal, Marek, Grater, Elizabeth, Marshall, Matthew, Hatton, Jade Elizabeth, Beaton, Alexander, Spencer, Robert G M
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: dissolved organic matter; DOM; Fluorescence; glaciers; PARAFAC; Event label; DATE/TIME; Period; Day of the year; Carbon, organic, dissolved; Fluorescence, dissolved organic matter, at 317 nm wavelength; Fluorescence, dissolved organic matter, at 483 nm wavelength; Fluorescence, dissolved organic matter, at 425 nm wavelength; Fluorescence, dissolved organic matter, at 416 nm wavelength; Fluorescence, dissolved organic matter, at 368 nm wavelength; Flow rate; Conductivity; Suspended particulate matter; pH; Nitrogen in nitrate; Phosphorus in orthophosphate; Carbon, organic, dissolved load; Snow/ice sample; Shimadzu TOC-L total organic carbon analyzer; Fluorescence spectrometer, AquaLog, HORIBA JobinYvon; Pressure transducer, HOBO; Campbell Scientific 247-L Conductivity and Temperature Probe; Roorkee Industries Suspended Sediment Sampler USDH-48; Honeywell Durafet pH sensors; Thermo Scientific Dionex IonPac AS11-HC-4μm Anion-Exchange Column fitted to a Thermo Scientific Dionex ICS-5000 Ion Chromatography; Lachat QuickChem 8500 flow injection autoanalyser; ZAIROV; L Atalante; Greenland; Leverett Glacier; glacier; Ice Sheet
• Online Access: https://dx.doi.org/10.1594/pangaea.910920; https://doi.pangaea.de/10.1594/PANGAEA.910920

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 ...