The silicon cycle impacted by past ice sheets

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10387180" target="_blank" >RIV/00216208:11310/18:10387180 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1038/s41467-018-05689-1" target="_blank" >https://doi.org/10.1038/s41467-018-05689-1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41467-018-05689-1" target="_blank" >10.1038/s41467-018-05689-1</a>

Result language
angličtina
Original language name
The silicon cycle impacted by past ice sheets
Original language description
Globally averaged riverine silicon (Si) concentrations and isotope composition (delta Si-30) 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 delta Si-30 composition of meltwater runoff from a Greenland Ice Sheet catchment. Glacier runoff has the lightest delta Si-30 measured in running waters (-0.25 +/- 0.12 parts per thousand), significantly lower than nonglacial rivers (1.25 +/- 0.68 parts per thousand), such that the overall decline in glacial runoff since the Last Glacial Maximum (LGM) may explain 0.06-0.17 parts per thousand of the observed ocean delta Si-30 rise (0.5-1.0 parts per thousand). A marine sediment core proximal to Iceland provides further evidence for transient, low-delta Si-30 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 diatoms in the biological carbon pump.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10618 - Ecology

Project
<a href="/en/project/GJ15-17346Y" target="_blank" >GJ15-17346Y: The bright future of subglacial ecosystems: Impacts of deglaciation on microbial activity and carbon cycling at glacier beds</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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