Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F21%3A00546869" target="_blank" >RIV/61388971:_____/21:00546869 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/21:10431643

Výsledek na webu

<a href="https://www.nature.com/articles/s41561-021-00753-w" target="_blank" >https://www.nature.com/articles/s41561-021-00753-w</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41561-021-00753-w" target="_blank" >10.1038/s41561-021-00753-w</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet

Popis výsledku v původním jazyce

The Greenland Ice Sheet is currently not accounted for in Arctic mercury budgets, despite large and increasing annual runoff to the ocean and the socio-economic concerns of high mercury levels in Arctic organisms. Here we present concentrations of mercury in meltwaters from three glacial catchments on the southwestern margin of the Greenland Ice Sheet and evaluate the export of mercury to downstream fjords based on samples collected during summer ablation seasons. We show that concentrations of dissolved mercury are among the highest recorded in natural waters and mercury yields from these glacial catchments (521-3,300 mmol km(-2) year(-1)) are two orders of magnitude higher than from Arctic rivers (4-20 mmol km(-2) year(-1)). Fluxes of dissolved mercury from the southwestern region of Greenland are estimated to be globally significant (15.4-212 kmol year(-1)), accounting for about 10% of the estimated global riverine flux, and include export of bioaccumulating methylmercury (0.31-1.97 kmol year(-1)). High dissolved mercury concentrations (similar to 20 pM inorganic mercury and similar to 2 pM methylmercury) were found to persist across salinity gradients of fjords. Mean particulate mercury concentrations were among the highest recorded in the literature (similar to 51,000 pM), and dissolved mercury concentrations in runoff exceed reported surface snow and ice values. These results suggest a geological source of mercury at the ice sheet bed. The high concentrations of mercury and its large export to the downstream fjords have important implications for Arctic ecosystems, highlighting an urgent need to better understand mercury dynamics in ice sheet runoff under global warming.

Název v anglickém jazyce

Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet

Popis výsledku anglicky

The Greenland Ice Sheet is currently not accounted for in Arctic mercury budgets, despite large and increasing annual runoff to the ocean and the socio-economic concerns of high mercury levels in Arctic organisms. Here we present concentrations of mercury in meltwaters from three glacial catchments on the southwestern margin of the Greenland Ice Sheet and evaluate the export of mercury to downstream fjords based on samples collected during summer ablation seasons. We show that concentrations of dissolved mercury are among the highest recorded in natural waters and mercury yields from these glacial catchments (521-3,300 mmol km(-2) year(-1)) are two orders of magnitude higher than from Arctic rivers (4-20 mmol km(-2) year(-1)). Fluxes of dissolved mercury from the southwestern region of Greenland are estimated to be globally significant (15.4-212 kmol year(-1)), accounting for about 10% of the estimated global riverine flux, and include export of bioaccumulating methylmercury (0.31-1.97 kmol year(-1)). High dissolved mercury concentrations (similar to 20 pM inorganic mercury and similar to 2 pM methylmercury) were found to persist across salinity gradients of fjords. Mean particulate mercury concentrations were among the highest recorded in the literature (similar to 51,000 pM), and dissolved mercury concentrations in runoff exceed reported surface snow and ice values. These results suggest a geological source of mercury at the ice sheet bed. The high concentrations of mercury and its large export to the downstream fjords have important implications for Arctic ecosystems, highlighting an urgent need to better understand mercury dynamics in ice sheet runoff under global warming.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10606 - Microbiology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Nature Geoscience

ISSN

1752-0894

e-ISSN

1752-0908

Svazek periodika

14

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

496-502

Kód UT WoS článku

000653667000001

EID výsledku v databázi Scopus

2-s2.0-85106294398