The silicon cycle impacted by past ice sheets ...
Globally averaged riverine silicon (Si) concentrations and isotope composition (δ30Si) may be affected by the expansion and retreat of large ice sheets during glacial−interglacial cycles. Here we provide evidence of this based on the δ30Si composition of meltwater runoff from a Greenland Ice Sheet c...
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ftdatacite:10.3929/ethz-b-000283991 2024-09-30T14:35:23+00:00 The silicon cycle impacted by past ice sheets ... Hawkings, Jon R. Hatton, Jade E. Hendry, Katharine R. De Souza, Gregory Wadham, Jemma Ivanovic, Ruza Kohler, Tyler J. Stibal, Marek Beaton, Alexander Lamarche-Gagnon, Guillaume Tedstone, Andrew Hain, Mathis P. Bagshaw, Elizabeth Pike, Jennifer Tranter, Martyn 2018 application/pdf https://dx.doi.org/10.3929/ethz-b-000283991 http://hdl.handle.net/20.500.11850/283991 en eng ETH Zurich info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 Text Journal Article ScholarlyArticle article-journal 2018 ftdatacite https://doi.org/10.3929/ethz-b-000283991 2024-09-02T07:54:09Z Globally averaged riverine silicon (Si) concentrations and isotope composition (δ30Si) may be affected by the expansion and retreat of large ice sheets during glacial−interglacial cycles. Here we provide evidence of this based on the δ30Si composition of meltwater runoff from a Greenland Ice Sheet catchment. Glacier runoff has the lightest δ30Si measured in running waters (−0.25 ± 0.12‰), significantly lower than nonglacial rivers (1.25 ± 0.68‰), such that the overall decline in glacial runoff since the Last Glacial Maximum (LGM) may explain 0.06–0.17‰ of the observed ocean δ30Si rise (0.5–1.0‰). A marine sediment core proximal to Iceland provides further evidence for transient, low-δ30Si meltwater pulses during glacial termination. Diatom Si uptake during the LGM was likely similar to present day due to an expanded Si inventory, which raises the possibility of a feedback between ice sheet expansion, enhanced Si export to the ocean and reduced CO2 concentration in the atmosphere, because of the importance of ... : Nature Communications, 9 ... Text glacier glacier Greenland Ice Sheet Iceland DataCite Greenland |
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English |
description |
Globally averaged riverine silicon (Si) concentrations and isotope composition (δ30Si) may be affected by the expansion and retreat of large ice sheets during glacial−interglacial cycles. Here we provide evidence of this based on the δ30Si composition of meltwater runoff from a Greenland Ice Sheet catchment. Glacier runoff has the lightest δ30Si measured in running waters (−0.25 ± 0.12‰), significantly lower than nonglacial rivers (1.25 ± 0.68‰), such that the overall decline in glacial runoff since the Last Glacial Maximum (LGM) may explain 0.06–0.17‰ of the observed ocean δ30Si rise (0.5–1.0‰). A marine sediment core proximal to Iceland provides further evidence for transient, low-δ30Si meltwater pulses during glacial termination. Diatom Si uptake during the LGM was likely similar to present day due to an expanded Si inventory, which raises the possibility of a feedback between ice sheet expansion, enhanced Si export to the ocean and reduced CO2 concentration in the atmosphere, because of the importance of ... : Nature Communications, 9 ... |
format |
Text |
author |
Hawkings, Jon R. Hatton, Jade E. Hendry, Katharine R. De Souza, Gregory Wadham, Jemma Ivanovic, Ruza Kohler, Tyler J. Stibal, Marek Beaton, Alexander Lamarche-Gagnon, Guillaume Tedstone, Andrew Hain, Mathis P. Bagshaw, Elizabeth Pike, Jennifer Tranter, Martyn |
spellingShingle |
Hawkings, Jon R. Hatton, Jade E. Hendry, Katharine R. De Souza, Gregory Wadham, Jemma Ivanovic, Ruza Kohler, Tyler J. Stibal, Marek Beaton, Alexander Lamarche-Gagnon, Guillaume Tedstone, Andrew Hain, Mathis P. Bagshaw, Elizabeth Pike, Jennifer Tranter, Martyn The silicon cycle impacted by past ice sheets ... |
author_facet |
Hawkings, Jon R. Hatton, Jade E. Hendry, Katharine R. De Souza, Gregory Wadham, Jemma Ivanovic, Ruza Kohler, Tyler J. Stibal, Marek Beaton, Alexander Lamarche-Gagnon, Guillaume Tedstone, Andrew Hain, Mathis P. Bagshaw, Elizabeth Pike, Jennifer Tranter, Martyn |
author_sort |
Hawkings, Jon R. |
title |
The silicon cycle impacted by past ice sheets ... |
title_short |
The silicon cycle impacted by past ice sheets ... |
title_full |
The silicon cycle impacted by past ice sheets ... |
title_fullStr |
The silicon cycle impacted by past ice sheets ... |
title_full_unstemmed |
The silicon cycle impacted by past ice sheets ... |
title_sort |
silicon cycle impacted by past ice sheets ... |
publisher |
ETH Zurich |
publishDate |
2018 |
url |
https://dx.doi.org/10.3929/ethz-b-000283991 http://hdl.handle.net/20.500.11850/283991 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier glacier Greenland Ice Sheet Iceland |
genre_facet |
glacier glacier Greenland Ice Sheet Iceland |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.3929/ethz-b-000283991 |
_version_ |
1811638679997775872 |