Fluorescence properties of dissolved organic matter from Leverett Glacier outflow


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.

DOI https://doi.org/10.1594/PANGAEA.910920
Related Identifier https://doi.org/10.1029/2019JG005161
Related Identifier https://doi.org/10.1029/2011GL047063
Related Identifier https://doi.org/10.1130/G32687.1
Related Identifier https://doi.org/10.1038/s41467-018-05689-1
Related Identifier https://doi.org/10.1002/2015GB005237
Related Identifier https://doi.org/10.1002/2017GL073219
Related Identifier https://doi.org/10.1039/C3AY41160E
Related Identifier https://doi.org/10.5194/bg-13-6339-2016
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.910920
Creator 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
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2020
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 785 data points
Discipline Earth System Research
Spatial Coverage (-50.230W, 67.060S, -50.200E, 67.090N); Greenland
Temporal Coverage Begin 2015-05-12T11:45:00Z
Temporal Coverage End 2015-10-28T00:00:00Z