Dissolved Carbon Dynamics in Meltwaters From the Russell Glacier, Greenland Ice Sheet

Andrews, M. Grace; Jacobson, Andrew D.; Osburn, Magdalena R.; Flynn, Theodore M.

doi:10.1029/2018jg004458

Title: Dissolved Carbon Dynamics in Meltwaters From the Russell Glacier, Greenland Ice Sheet

Journal Article · 19 July 2018 · Journal of Geophysical Research. Biogeosciences

DOI: https://doi.org/10.1029/2018jg004458 · OSTI ID:1491855

^[1];

^[2]

Northwestern Univ., Evanston, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Melting of the Greenland Ice Sheet (GrIS) has accelerated in recent decades. Given the close association between the water and carbon (C) cycles, melting of the GrIS may also drive local and global C cycle feedbacks. However, few studies have quantified such feedbacks, which may have important implications for predicting future climate or understanding linkages between ice sheet destabilization and climate change in the geologic past. Here, we investigate seasonal and interannual dissolved C cycling at the margin of the Russell Glacier, west Greenland. By synthesizing isotopic analyses of water (δ¹⁸O) and C (δ¹³C and Δ¹⁴C) with geomicrobiological observations, we present evidence for previously unknown connections between the GrIS's supra– and sub–glacial dissolved C cycles. Supraglacial streams have variable concentrations of dissolved organic carbon (DOC) and are the dominant source of DOC in subglacial discharge. Supraglacial stream dissolved inorganic carbon (DIC) concentrations are uniform and sourced from a spatially and temporally constant mixture of organic C (~25%) respired by aerobic heterotrophs inhabiting the GrIS surface and dissolved atmospheric C (~75%). Supraglacial inputs account for ~50% of subglacial discharge DIC. The remaining subglacial DIC derives from carbonate weathering and microbial CO₂ production, with the latter attributable to abundant anaerobic heterotrophic communities observed in subglacial discharge. Furthermore, we find that supraglacial streams deliver young DOC to the subglacial environment during snowmelt and rain events. In conclusion, these pulses of organic C may drive heterotrophic microbial respiration, with the cumulative effect being a seasonal shift in the source of basal DIC, from microbial– to carbonate–dominated.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1491855

Journal Information:: Journal of Geophysical Research. Biogeosciences, Journal Name: Journal of Geophysical Research. Biogeosciences Journal Issue: 9 Vol. 123; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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