Carbon Flux and Weathering Processes in Icelandic Glacial-Fed Rivers
An investigation into the carbon dynamics and weathering processes occurring in Icelandic glacial-fed streams was conducted during the spring to summer seasonal transition in June of 2017. Four major outlet rives were sampled from the glaciers of Gígjökull, Steinsholtsjökull, Sólheimajökull, and Fal...
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ftwesternkent:oai:digitalcommons.wku.edu:theses-3586 2023-05-15T15:52:59+02:00 Carbon Flux and Weathering Processes in Icelandic Glacial-Fed Rivers Quiroga, Allison 2018-04-01T07:00:00Z application/pdf https://digitalcommons.wku.edu/theses/2568 https://digitalcommons.wku.edu/cgi/viewcontent.cgi?article=3586&context=theses unknown TopSCHOLAR® https://digitalcommons.wku.edu/theses/2568 https://digitalcommons.wku.edu/cgi/viewcontent.cgi?article=3586&context=theses Masters Theses & Specialist Projects Geochemistry glacier climate change global warming Environmental Sciences Fresh Water Studies Glaciology text 2018 ftwesternkent 2022-12-11T12:26:37Z An investigation into the carbon dynamics and weathering processes occurring in Icelandic glacial-fed streams was conducted during the spring to summer seasonal transition in June of 2017. Four major outlet rives were sampled from the glaciers of Gígjökull, Steinsholtsjökull, Sólheimajökull, and Falljökull. Markarfljót, the major river that Gígjökull, Steinsholtsjökull, and many other glaciers drain into, was also sampled. Longitudinal sampling occurred at all sites to capture downstream trends in the hydrogeochemistry and carbon dynamics. Distinct differences in geochemistry between glacier surface meltwater, sub-glacial waters, pro-glacial lake water, and post-mixed downstream samples were evident in the data. Glacier surface streams were characterized by relatively colder water temperatures, lower specific conductivity, lower total dissolved solids (TDS) and ion concentrations, and more enriched δ13CDIC values than downstream samples. The THINCARB model was used to calculate the total dissolved inorganic carbon (TDIC), excess partial pressure of carbon dioxide (EpCO2), and percent contribution to TDIC by bicarbonate (HCO3), carbonate (CO3), and carbonic acid and dissolved CO2 (H2CO3). All sites showed a slight decreasing trend in DIC and EpCO2 downstream. The calculated CO2 flux ranged from 1.14 × 107 g/yr to 2.80 × 109 g/yr. The DIC flux ranged from 6.81 × 107 g/yr to 8.44 × 109 g/yr. The average carbon within the CO2 fluxing in these rivers accounts for 0.0004% of the annual, global flux of carbon. The δ13C values were the most variable throughout the study and indicate there are multiple sources influencing the river downstream. This study suggests that, despite previous assumptions and estimations, these glacial-fed rivers act as sources of CO2; however, the samples from this study only provide a snapshot into the carbon flux dynamics during the Spring to Summer seasonal transition. In most samples, HCO3 was the dominant species contributing to DIC content within the rivers, suggesting that DIC is being ... Text Carbonic acid Western Kentucky University (WKU): TopScholar Falljökull ENVELOPE(-16.770,-16.770,63.976,63.976) Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Markarfljót ENVELOPE(-20.101,-20.101,63.530,63.530) Sólheimajökull ENVELOPE(-19.303,-19.303,63.557,63.557) |
institution |
Open Polar |
collection |
Western Kentucky University (WKU): TopScholar |
op_collection_id |
ftwesternkent |
language |
unknown |
topic |
Geochemistry glacier climate change global warming Environmental Sciences Fresh Water Studies Glaciology |
spellingShingle |
Geochemistry glacier climate change global warming Environmental Sciences Fresh Water Studies Glaciology Quiroga, Allison Carbon Flux and Weathering Processes in Icelandic Glacial-Fed Rivers |
topic_facet |
Geochemistry glacier climate change global warming Environmental Sciences Fresh Water Studies Glaciology |
description |
An investigation into the carbon dynamics and weathering processes occurring in Icelandic glacial-fed streams was conducted during the spring to summer seasonal transition in June of 2017. Four major outlet rives were sampled from the glaciers of Gígjökull, Steinsholtsjökull, Sólheimajökull, and Falljökull. Markarfljót, the major river that Gígjökull, Steinsholtsjökull, and many other glaciers drain into, was also sampled. Longitudinal sampling occurred at all sites to capture downstream trends in the hydrogeochemistry and carbon dynamics. Distinct differences in geochemistry between glacier surface meltwater, sub-glacial waters, pro-glacial lake water, and post-mixed downstream samples were evident in the data. Glacier surface streams were characterized by relatively colder water temperatures, lower specific conductivity, lower total dissolved solids (TDS) and ion concentrations, and more enriched δ13CDIC values than downstream samples. The THINCARB model was used to calculate the total dissolved inorganic carbon (TDIC), excess partial pressure of carbon dioxide (EpCO2), and percent contribution to TDIC by bicarbonate (HCO3), carbonate (CO3), and carbonic acid and dissolved CO2 (H2CO3). All sites showed a slight decreasing trend in DIC and EpCO2 downstream. The calculated CO2 flux ranged from 1.14 × 107 g/yr to 2.80 × 109 g/yr. The DIC flux ranged from 6.81 × 107 g/yr to 8.44 × 109 g/yr. The average carbon within the CO2 fluxing in these rivers accounts for 0.0004% of the annual, global flux of carbon. The δ13C values were the most variable throughout the study and indicate there are multiple sources influencing the river downstream. This study suggests that, despite previous assumptions and estimations, these glacial-fed rivers act as sources of CO2; however, the samples from this study only provide a snapshot into the carbon flux dynamics during the Spring to Summer seasonal transition. In most samples, HCO3 was the dominant species contributing to DIC content within the rivers, suggesting that DIC is being ... |
format |
Text |
author |
Quiroga, Allison |
author_facet |
Quiroga, Allison |
author_sort |
Quiroga, Allison |
title |
Carbon Flux and Weathering Processes in Icelandic Glacial-Fed Rivers |
title_short |
Carbon Flux and Weathering Processes in Icelandic Glacial-Fed Rivers |
title_full |
Carbon Flux and Weathering Processes in Icelandic Glacial-Fed Rivers |
title_fullStr |
Carbon Flux and Weathering Processes in Icelandic Glacial-Fed Rivers |
title_full_unstemmed |
Carbon Flux and Weathering Processes in Icelandic Glacial-Fed Rivers |
title_sort |
carbon flux and weathering processes in icelandic glacial-fed rivers |
publisher |
TopSCHOLAR® |
publishDate |
2018 |
url |
https://digitalcommons.wku.edu/theses/2568 https://digitalcommons.wku.edu/cgi/viewcontent.cgi?article=3586&context=theses |
long_lat |
ENVELOPE(-16.770,-16.770,63.976,63.976) ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(-20.101,-20.101,63.530,63.530) ENVELOPE(-19.303,-19.303,63.557,63.557) |
geographic |
Falljökull Glacial Lake Markarfljót Sólheimajökull |
geographic_facet |
Falljökull Glacial Lake Markarfljót Sólheimajökull |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Masters Theses & Specialist Projects |
op_relation |
https://digitalcommons.wku.edu/theses/2568 https://digitalcommons.wku.edu/cgi/viewcontent.cgi?article=3586&context=theses |
_version_ |
1766388060192243712 |