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
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