The silicon cycle impacted by past ice sheets

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

The silicon cycle impacted by past ice sheets

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

The silicon cycle impacted by past ice sheets

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10618 - Ecology

Projekt

<a href="/cs/project/GJ15-17346Y" target="_blank" >GJ15-17346Y: Světlé zítřky subglaciálních ekosystémů: Dopady odledňování na mikrobiální aktivitu a koloběh uhlíku pod ledovci</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature Communications [online]

ISSN

2041-1723

e-ISSN

—

Svazek periodika

9

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

000441306700006

EID výsledku v databázi Scopus

2-s2.0-85051530962