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The influence of glacial cover on riverine silicon and iron exports in Chilean Patagonia

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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 mu m) concentrations were relatively low in glacier-fed rivers, whereas concentrations of colloidal-nanoparticulate (0.02-0.45 mu m) 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 mu m) 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.
Keywords
Patagonia, silicon, iron, rivers, nutrients, glaciers, SEA-LEVEL RISE, CHEMICAL DENUDATION, ELEMENT CONCENTRATIONS, GEOCHEMICAL PROCESSES, FILTRATION ARTIFACTS, NORTHERN PATAGONIA, BIOGENIC SILICA, WORLD OCEAN, GREENLAND, CHEMISTRY

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MLA
Pryer, Helena V., et al. “The Influence of Glacial Cover on Riverine Silicon and Iron Exports in Chilean Patagonia.” GLOBAL BIOGEOCHEMICAL CYCLES, vol. 34, no. 12, 2020, doi:10.1029/2020GB006611.
APA
Pryer, H. V., Hawkings, J. R., Wadham, J. L., Robinson, L. F., Hendry, K. R., Hatton, J. E., … Haussermann, V. (2020). The influence of glacial cover on riverine silicon and iron exports in Chilean Patagonia. GLOBAL BIOGEOCHEMICAL CYCLES, 34(12). https://doi.org/10.1029/2020GB006611
Chicago author-date
Pryer, Helena V., Jon R. Hawkings, Jemma L. Wadham, Laura F. Robinson, Katharine R. Hendry, Jade E. Hatton, Anne M. Kellerman, et al. 2020. “The Influence of Glacial Cover on Riverine Silicon and Iron Exports in Chilean Patagonia.” GLOBAL BIOGEOCHEMICAL CYCLES 34 (12). https://doi.org/10.1029/2020GB006611.
Chicago author-date (all authors)
Pryer, Helena V., Jon R. Hawkings, Jemma L. Wadham, Laura F. Robinson, Katharine R. Hendry, Jade E. Hatton, Anne M. Kellerman, Sebastien Bertrand, Beatriz Gill-Olivas, Matthew G. Marshall, Richard A. Brooker, Giovanni Daneri, and Vreni Haussermann. 2020. “The Influence of Glacial Cover on Riverine Silicon and Iron Exports in Chilean Patagonia.” GLOBAL BIOGEOCHEMICAL CYCLES 34 (12). doi:10.1029/2020GB006611.
Vancouver
1.
Pryer HV, Hawkings JR, Wadham JL, Robinson LF, Hendry KR, Hatton JE, et al. The influence of glacial cover on riverine silicon and iron exports in Chilean Patagonia. GLOBAL BIOGEOCHEMICAL CYCLES. 2020;34(12).
IEEE
[1]
H. V. Pryer et al., “The influence of glacial cover on riverine silicon and iron exports in Chilean Patagonia,” GLOBAL BIOGEOCHEMICAL CYCLES, vol. 34, no. 12, 2020.
@article{8693405,
  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 mu m) concentrations were relatively low in glacier-fed rivers, whereas concentrations of colloidal-nanoparticulate (0.02-0.45 mu m) 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 mu m) 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.}},
  articleno    = {{e2020GB006611}},
  author       = {{Pryer, Helena V. and Hawkings, Jon R. and Wadham, Jemma L. and Robinson, Laura F. and Hendry, Katharine R. and Hatton, Jade E. and Kellerman, Anne M. and Bertrand, Sebastien and Gill-Olivas, Beatriz and Marshall, Matthew G. and Brooker, Richard A. and Daneri, Giovanni and Haussermann, Vreni}},
  issn         = {{0886-6236}},
  journal      = {{GLOBAL BIOGEOCHEMICAL CYCLES}},
  keywords     = {{Patagonia,silicon,iron,rivers,nutrients,glaciers,SEA-LEVEL RISE,CHEMICAL DENUDATION,ELEMENT CONCENTRATIONS,GEOCHEMICAL PROCESSES,FILTRATION ARTIFACTS,NORTHERN PATAGONIA,BIOGENIC SILICA,WORLD OCEAN,GREENLAND,CHEMISTRY}},
  language     = {{eng}},
  number       = {{12}},
  pages        = {{23}},
  title        = {{The influence of glacial cover on riverine silicon and iron exports in Chilean Patagonia}},
  url          = {{http://dx.doi.org/10.1029/2020GB006611}},
  volume       = {{34}},
  year         = {{2020}},
}

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