High mercury accumulation in deep-ocean hadal sediments

Abstract Ocean sediments are the largest sink for mercury (Hg) sequestration and hence an important part of the global Hg cycle1. Yet accepted global average Hg flux data for deep-ocean sediments (> 200 m depth) are not based on measurements on sediments but are inferred from sinking particulates...

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Autores principales:	Hamed Sanei, Peter M. Outridge, Kazumasa Oguri, Gary A. Stern, Bo Thamdrup, Frank Wenzhöfer, Feiyue Wang, Ronnie N. Glud
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a708ff647a8a46349d9a8ecfd01410d1
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spelling	oai:doaj.org-article:a708ff647a8a46349d9a8ecfd01410d12021-12-02T15:00:59ZHigh mercury accumulation in deep-ocean hadal sediments10.1038/s41598-021-90459-12045-2322https://doaj.org/article/a708ff647a8a46349d9a8ecfd01410d12021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90459-1https://doaj.org/toc/2045-2322Abstract Ocean sediments are the largest sink for mercury (Hg) sequestration and hence an important part of the global Hg cycle1. Yet accepted global average Hg flux data for deep-ocean sediments (> 200 m depth) are not based on measurements on sediments but are inferred from sinking particulates2. Mercury fluxes have never been reported from the deepest zone, the hadal (> 6 km depth). Here we report the first measurements of Hg fluxes from two hadal trenches (Atacama and Kermadec) and adjacent abyssal areas (2–6 km). Mercury concentrations of up to 400 ng g−1 were the highest recorded in marine sediments remote from anthropogenic or hydrothermal sources. The two trench systems differed significantly in Hg concentrations and fluxes, but hadal and abyssal areas within each system did not. The relatively low recent mean flux at Kermadec was 6–15 times higher than the inferred deep-ocean average1,3, while the median flux across all cores was 22–56 times higher. Thus, some hadal and abyssal sediments are Hg accumulation hot-spots. The hadal zone comprises only ~ 1% of the deep-ocean area, yet a preliminary estimate based on sediment Hg and particulate organic carbon (POC) fluxes suggests total hadal Hg accumulation may be 12–30% of the estimate for the entire deep-ocean. The few abyssal data show equally high Hg fluxes near trench systems. These results highlight a need for further research into deep-ocean Hg fluxes to better constrain global Hg models.Hamed SaneiPeter M. OutridgeKazumasa OguriGary A. SternBo ThamdrupFrank WenzhöferFeiyue WangRonnie N. GludNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hamed Sanei Peter M. Outridge Kazumasa Oguri Gary A. Stern Bo Thamdrup Frank Wenzhöfer Feiyue Wang Ronnie N. Glud High mercury accumulation in deep-ocean hadal sediments
description	Abstract Ocean sediments are the largest sink for mercury (Hg) sequestration and hence an important part of the global Hg cycle1. Yet accepted global average Hg flux data for deep-ocean sediments (> 200 m depth) are not based on measurements on sediments but are inferred from sinking particulates2. Mercury fluxes have never been reported from the deepest zone, the hadal (> 6 km depth). Here we report the first measurements of Hg fluxes from two hadal trenches (Atacama and Kermadec) and adjacent abyssal areas (2–6 km). Mercury concentrations of up to 400 ng g−1 were the highest recorded in marine sediments remote from anthropogenic or hydrothermal sources. The two trench systems differed significantly in Hg concentrations and fluxes, but hadal and abyssal areas within each system did not. The relatively low recent mean flux at Kermadec was 6–15 times higher than the inferred deep-ocean average1,3, while the median flux across all cores was 22–56 times higher. Thus, some hadal and abyssal sediments are Hg accumulation hot-spots. The hadal zone comprises only ~ 1% of the deep-ocean area, yet a preliminary estimate based on sediment Hg and particulate organic carbon (POC) fluxes suggests total hadal Hg accumulation may be 12–30% of the estimate for the entire deep-ocean. The few abyssal data show equally high Hg fluxes near trench systems. These results highlight a need for further research into deep-ocean Hg fluxes to better constrain global Hg models.
format	article
author	Hamed Sanei Peter M. Outridge Kazumasa Oguri Gary A. Stern Bo Thamdrup Frank Wenzhöfer Feiyue Wang Ronnie N. Glud
author_facet	Hamed Sanei Peter M. Outridge Kazumasa Oguri Gary A. Stern Bo Thamdrup Frank Wenzhöfer Feiyue Wang Ronnie N. Glud
author_sort	Hamed Sanei
title	High mercury accumulation in deep-ocean hadal sediments
title_short	High mercury accumulation in deep-ocean hadal sediments
title_full	High mercury accumulation in deep-ocean hadal sediments
title_fullStr	High mercury accumulation in deep-ocean hadal sediments
title_full_unstemmed	High mercury accumulation in deep-ocean hadal sediments
title_sort	high mercury accumulation in deep-ocean hadal sediments
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a708ff647a8a46349d9a8ecfd01410d1
work_keys_str_mv	AT hamedsanei highmercuryaccumulationindeepoceanhadalsediments AT petermoutridge highmercuryaccumulationindeepoceanhadalsediments AT kazumasaoguri highmercuryaccumulationindeepoceanhadalsediments AT garyastern highmercuryaccumulationindeepoceanhadalsediments AT bothamdrup highmercuryaccumulationindeepoceanhadalsediments AT frankwenzhofer highmercuryaccumulationindeepoceanhadalsediments AT feiyuewang highmercuryaccumulationindeepoceanhadalsediments AT ronnienglud highmercuryaccumulationindeepoceanhadalsediments
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High mercury accumulation in deep-ocean hadal sediments

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