ArticleGlobal biogeochemical cycles2020
The Influence of Glacial Cover on Riverine Silicon and Iron Exports in Chilean Patagonia.
Article in Global biogeochemical cycles, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Insights into silicon cycling from ice sheet to coastal ocean from isotope geochemistry.Communications earth & environment · 2025Review
- Iron (hydr)oxide formation in Andosols under extreme climate conditions.Scientific reports · 2023Article
- Systematic changes in circumpolar dust transport to the Subantarctic Pacific Ocean over the last two glacial cycles.Proceedings of the National Academy of Sciences of the United States of America · 2022Article
- Benthic Dissolved Silicon and Iron Cycling at Glaciated Patagonian Fjord Heads.Global biogeochemical cycles · 2022Article
- The Influence of Glacial Cover on Riverine Silicon and Iron Exports in Chilean Patagonia.Global biogeochemical cycles · 2020Article
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Authors and funding
13 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Glaciated environments have been highlighted as important sources of bioavailable nutrients, with inputs of glacial meltwater potentially influencing productivity in downstream ecosystems. However, it is currently unclear how riverine nutrient concentrations vary across a spectrum of glacial cover, making it challenging to accurately predict how terrestrial fluxes will change with continued glacial retreat. Using 40 rivers in Chilean Patagonia as a unique natural laboratory, we investigate how glacial cover affects riverine Si and Fe concentrations, and infer how exports of these bioessential nutrients may change in the future. Dissolved Si (as silicic acid) and soluble Fe (<0.02 μm) concentrations were relatively low in glacier-fed rivers, whereas concentrations of colloidal-nanoparticulate (0.02-0.45 μm) Si and Fe increased significantly as a function of glacial cover. These colloidal-nanoparticulate phases were predominately composed of aluminosilicates and Fe-oxyhydroxides, highlighting the need for size-fractionated analyses and further research to quantify the lability of colloidal-nanoparticulate species. We also demonstrate the importance of reactive particulate (>0.45 μm) phases of both Si and Fe, which are not typically accounted for in terrestrial nutrient budgets but can dominate riverine exports. Dissolved Si and soluble Fe yield estimates showed no trend with glacial cover, suggesting no significant change in total exports with continued glacial retreat. However, yields of colloidal-nanoparticulate and reactive sediment-bound Si and Fe were an order of magnitude greater in highly glaciated catchments and showed significant positive correlations with glacial cover. As such, regional-scale exports of these phases are likely to decrease as glacial cover disappears across Chilean Patagonia, with potential implications for downstream ecosystems.
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