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Glacial environments play an important role in high-latitude marine nutrient cycling, potentially contributing significant fluxes of silicon (Si) to the polar oceans, either as dissolved silicon (DSi) or as dissolvable amorphous silica (ASi). Silicon is a key nutrient in promoting marine primary productivity, contributing to atmospheric CO2 removal. We present the current understanding of Si cycling in glacial systems, focusing on the Si isotope (δ30Si) composition of glacial meltwaters. We combine existing glacial δ30Si data with new measurements from 20 subArctic glaciers, showing that glacial meltwaters consistently export isotopically light DSi compared with non-glacial rivers (+0.16 versus +1.38). Glacial δ30SiASi composition ranges from −0.05 to −0.86 but exhibits low seasonal variability. Silicon fluxes and δ30Si composition from glacial systems are not commonly included in global Si budgets and isotopic mass balance calculations at present. We discuss outstanding questions, including the formation mechanism of ASi and the export of glacial nutrients from fjords. Finally, we provide a contextual framework for the recent advances in our understanding of subglacial Si cycling and highlight critical research avenues for assessing potential future changes in these environments.
|Number of pages||27|
|Journal||Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences|
|Publication status||Published - 14 Aug 2019|
- Glaciers and Ice Sheets
- Silicon Cycle
- Silicon Isotopes
- Subglacial Weathering
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Silicon Cycling in Subglacial Environments: An Investigation into Glacial Silicon Isotope SystematicsAuthor: Hatton, J., 25 Jun 2019
Supervisor: Hendry, K. (Supervisor) & Wadham, J. (Supervisor)
Student thesis: Doctoral Thesis › Doctor of Philosophy (PhD)File