Glacier naled evolution and relation to the subglacial drainage system based on water chemistry and GPR surveys (Werenskioldbreen, SW Svalbard)
| Autor: | Lukasz Mariusz Stachnik, Marta Kondracka, Dariusz Ignatiuk, Jacob C. Yde, Magdalena Grzesik |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
010504 meteorology & atmospheric sciences
Meltwater chemistry Weathering 010502 geochemistry & geophysics 01 natural sciences meltwater chemistry chemistry.chemical_compound Ground-penetrating radar Drainage system (geomorphology) Meltwater glacier chemistry Geomorphology VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 0105 earth and related environmental sciences Earth-Surface Processes ground-penetrating radar geography geography.geographical_feature_category Tidewater glacier cycle Glacier Glacier hydrochemistry Glacier morphology glacier hydrochemistry Glacier chemistry chemistry Moraine Carbonate ice chemistry Ice chemistry Geology |
| Zdroj: | Annals of Glaciology Annals of glaciology |
| Popis: | Glacier naledi are extrusive ice masses that appear in front of glaciers as a consequence of refreezing of meltwater seepage during the accumulation season. These structures provide a unique opportunity to understand subglacial drainage activity during the accumulation season; however, only few detailed studies have previously focused on their characteristics. Here, we investigated glacier-derived naled assemblages in the proglacial zone of the polythermal glacier Werenskioldbreen (27.4 km2) in SW Svalbard. We determined the spatial distribution of naledi using ground penetrating radar surveys. The main subglacial drainage pattern was related to a channel under the medial moraine, and three sources are linked to a distributed subglacial drainage network. The relation between atmospherically-corrected (Ca2+ + Mg2+) and (SO42−) in sub-naled waters was closely related to sulphide oxidation coupled with carbonate dissolution (r = 0.99; slope = 1.6). This is consistent with the local lithology, which is dominated by schist containing carbonates. We also found high carbonate saturation indices in pale white ice layers within the naled. We conclude that sulphide oxidation coupled with carbonate dissolution is the dominant chemical weathering process in the subglacial drainage system of Werenskioldbreen during the accumulation season. |
| Databáze: | OpenAIRE |
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