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Input of terrestrial organic matter linked to deglaciation increased mercury transport to the Svalbard fjords SCIE SCOPUS

Title
Input of terrestrial organic matter linked to deglaciation increased mercury transport to the Svalbard fjords
Authors
KWON, SAE YUNKIM, HARYUNLEE, KITACKLIM, DHONGILHAN, SEUNGHEEKIM, TAE-WOOKJOO, YOUNG JILIM, JAESOOKANG, MOO-HEENAM, SEUNG-IL
Date Issued
2020-02-26
Publisher
NATURE PUBLISHING GROUP
Abstract
Deglaciation has accelerated the transport of minerals as well as modern and ancient organic matter from land to fjord sediments in Spitsbergen, Svalbard, in the European Arctic Ocean. Consequently, such sediments may contain significant levels of total mercury (THg) bound to terrestrial organic matter. The present study compared THg contents in surface sediments from three fjord settings in Spitsbergen: Hornsund in the southern Spitsbergen, which has high annual volume of loss glacier and receives sediment from multiple tidewater glaciers, Dicksonfjorden in the central Spitsbergen, which receives sediment from glacifluvial rivers, and Wijdefjorden in the northern Spitsbergen, which receive sediments from a mixture of tidewater glaciers and glacifluvial rivers. Our results showed that the THg (52 +/- 15 ng g(-1)) bound to organic matter (OM) was the highest in the Hornsund surface sediments, where the glacier loss (0.44 km(3) yr(-1)) and organic carbon accumulation rates (9.3 similar to 49.4 g m(-2) yr(-1)) were elevated compared to other fjords. Furthermore, the delta C-13 (-27 similar to -24 parts per thousand) and delta S-34 values (-10 similar to 15 parts per thousand) of OM indicated that most of OM were originated from terrestrial sources. Thus, the temperature-driven glacial melting could release more OM originating from the meltwater or terrestrial materials, which are available for THg binding in the European Arctic fjord ecosystems.
Keywords
ATMOSPHERIC MERCURY; ARCTIC FJORD; ANTHROPOGENIC MERCURY; ISOTOPIC COMPOSITION; METAL CONTAMINATION; TIDEWATER GLACIER; STABLE-ISOTOPES; LAKE-SEDIMENTS; CARBON BURIAL; MARINE
URI
https://oasis.postech.ac.kr/handle/2014.oak/101768
DOI
10.1038/s41598-020-60261-6
ISSN
2045-2322
Article Type
Article
Citation
SCIENTIFIC REPORTS, vol. 10, no. 1, 2020-02-26
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이기택LEE, KITACK
Div of Environmental Science & Enginrg
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