Spatial patterns and distributional controls of total and methylated mercury off the Lena River in the Laptev Sea sediments

doi:10.1016/j.marchem.2021.104052

Эндаумент фонд ТГУ!
Впиши своё имя в историю университета
- Сделать пожертвование -

Add to "Quick Collection"

Description	Size	Format
Spatial patterns and distributional controls of total and methylated mercury off the Lena River in the Laptev Sea sediments	1 MB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1016/j.marchem.2021.104052

#Лена, река

#Лаптевых море

#метилированная ртуть

Title: Spatial patterns and distributional controls of total and methylated mercury off the Lena River in the Laptev Sea sediments
Creator: Liem-Nguyen, Van
|
Wild, Birgit
|
Gustafsson, Örjan
|
Semiletov, Igor P.
|
Dudarev, Oleg V.
|
Jonsson, Sofi
Date: 2022
DOI: 10.1016/j.marchem.2021.104052
Description: A warmer climate is predicted to accelerate the export of mercury (Hg) from Siberian rivers to the Arctic Ocean, yet there is a dearth of process-oriented studies on the speciation and fate of Hg in the shelf sea system. Here, we present data on total Hg (HgT) and methylmercury (MeHg) in Laptev Sea surface sediments along a cross-shelf transect starting at the mouth of the Lena River. Concentrations of HgT along the 330 km cross-shelf transect ranged within a fairly narrow span from 480 to 150 pmol g−1 d.w., while concentrations of MeHg decreased one hundredfold from 13 pmol g−1 d.w. near the Lena river to 0.095 pmol g−1 d.w. in the more distall stations. The highest concentrations of HgT and MeHg were observed close to the river delta and were associated with a high supply of organic carbon (OC). Enrichment of the OC normalized HgT concentration (HgTOC) and depletion of the OC normalized MeHg concentration (MeHgOC) across the shelf suggests bulk OC content to not be the only driver of the HgT and MeHg spatial distributions. Based on correlations observed between HgTOC and MeHgOC and proxies for sediment physics and organic matter pools we suggest the spatial distribution of Hg and MeHg to also be influenced by hydrodynamic sorting of riverine-derived material. For MeHg, depletion of the MeHgOC across the shelf is likely driven by the trapping of terrestrial MeHg in sediments close to the river delta before it is degraded in the water column.

Relationships: Show Relationship Browser for this Object
collection(s): Научное управление
Identifier: смотреть в электронном каталоге НБ ТГУ
Type: статьи в журналах
Source: Marine chemistry. 2022. Vol. 238. P. 104052 (1-7)
Language: eng

Created: 16-01-2023

1168 Visitors

1095 Hits

128 Downloads

Научное управление Spatial patterns and distributional controls of total and methylated mercury off the Lena River in the Laptev Sea sediments