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Dissolved and Particulate Organic Carbon in Icelandic Proglacial Streams: A First Estimate

1
Department of Geography, Philipps-University Marburg, 35032 Marburg, Germany
2
Department of Biology, Trent University, 1600 W Bank Dr, Peterborough, ON K9J 0G2, Canada
3
Department of Limnology and Bio-Oceanography, University of Vienna, 1090 Vienna, Austria
*
Author to whom correspondence should be addressed.
Water 2019, 11(4), 748; https://doi.org/10.3390/w11040748
Received: 24 February 2019 / Revised: 5 April 2019 / Accepted: 5 April 2019 / Published: 10 April 2019
(This article belongs to the Section Water Quality and Ecosystems)
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Abstract

Here for the first time, we analyze the concentration of dissolved (DOC) and particulate organic carbon (POC), as well as its optical properties (absorbance and fluorescence) from several proglacial streams across Iceland, the location of Europe’s largest non-polar ice cap. We found high spatial variability of DOC concentrations and dissolved organic matter (DOM) composition during peak melt, sampling 13 proglacial streams draining the 5 main Icelandic glaciers. Although glacial-derived organic matter (OM) was dominated by proteinaceous florescence, organic matter composition was variable among glaciers, often exhibiting relatively higher aromatic content and increased humification (based on absorbance and fluorescence measurements) closer to the glacier terminus, modulated by the presence of glacial lakes. Additional sampling locations the in flow path of the river Hvitá revealed that while POC concentrations decreased downstream, DOC concentrations and the autochthonous fraction of OM increased, suggesting the reworking of the organic carbon by microbial communities, with likely implications for downstream ecosystems as glaciers continue to melt. Based on our measured DOC concentrations ranging from 0.11 mg·L−1 to 0.94 mg·L−1, we estimate a potential annual carbon release of 0.008 ± 0.002 Tg·C·yr−1 from Icelandic glaciers. This non-conservative first estimate serves to highlight the potentially significant contribution of Icelandic pro-glacial streams to the global carbon cycle and the need for the quantification and determination of the spatio-temporal variation of DOC and POC fluxes and their respective drivers, particularly in light of increased rates of melting due to recent trends in climatic warming. View Full-Text
Keywords: dissolved and particulate organic carbon; proglacial streams; glacier; Iceland; DOM composition dissolved and particulate organic carbon; proglacial streams; glacier; Iceland; DOM composition
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chifflard, P.; Fasching, C.; Reiss, M.; Ditzel, L.; Boodoo, K.S. Dissolved and Particulate Organic Carbon in Icelandic Proglacial Streams: A First Estimate. Water 2019, 11, 748.

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