Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/tc-2018-32
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
08 Mar 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal The Cryosphere (TC).
Dissolved and particulate organic carbon in Icelandic proglacial streams
Peter Chifflard1, Christina Fasching2,a, Martin Reiss1, and Lukas Ditzel1 1Department of Geography, Philipps - University Marburg, Marburg, 35032, Germany
2Department of Limnology, University of Vienna, Vienna, 1090, Austria
anow at: Department of Biology, Trent University, Peterborough, 1600, Canada
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) in proglacial streams of Iceland, location of Europe's largest nonpolar ice cap. DOC and POC concentrations range from 0.11 mg L−1 to 0.94 mg L−1 and from 0.67 mg L−1 to 173.33 mg L−1, respectively. We estimate an annual release of 0.008 Tg C yr−1 (DOC) and 1.72 Tg C yr−1 (POC) from Icelandic glaciers. Compared to the global release of 1.97 Tg C yr−1 POC, these first calculations underline the necessity to include the Icelandic glaciers in global organic carbon budgets. Based on optical properties, we found that 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 closer to the glacier terminus, modulated by the presence of glacial lakes. While POC concentration decreased downstream, DOC concentration as well as the autochthonous fraction of OM increased suggesting the reworking of the OC by microbial communities, which has implications for downstream ecosystems as glaciers continue to melt.
Citation: Chifflard, P., Fasching, C., Reiss, M., and Ditzel, L.: Dissolved and particulate organic carbon in Icelandic proglacial streams, The Cryosphere Discuss., https://doi.org/10.5194/tc-2018-32, in review, 2018.
Peter Chifflard et al.
Peter Chifflard et al.
Peter Chifflard et al.

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Short summary
For the first time, the concentration of dissolved and particulate organic carbon, as well as its optical properties in proglacial streams of Iceland, location of Europe‚Äôs largest nonpolar ice cap, was analyzed. Compared to the global annual release of 1.97 Tg C yr−1 POC, the estimation of annual release of 0.008 Tg C yr−1 (DOC) and 1.72 Tg C yr−1 (POC) from Icelandic glaciers underline the necessity to include the Icelandic glaciers in global organic carbon budget, which has not yet been done.
For the first time, the concentration of dissolved and particulate organic carbon, as well as...
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