Sökning: hsv:(NATURAL SCIENCES) hsv:(Earth and Related Environmental Sciences) hsv:(Oceanography Hydrology and Water Resources) >
Deciphering the Rol...
Deciphering the Role of Water Column Redoxclines on Methylmercury Cycling Using Speciation Modeling and Observations From the Baltic Sea
-
- Soerensen, Anne L. (författare)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
-
- Schartup, A. T. (författare)
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge MA, USA
-
- Skrobonja, Aleksandra (författare)
- Umeå universitet,Kemiska institutionen
-
visa fler...
-
- Bouchet, S. (författare)
- Now at D-USYS Department, ETH Zürich, Zürich, Switzerland; Institut des Sciences Analytiques et de Physico-chimie pour l ’ Environnement et les Materiaux, CNRS/UNIV PAU & PAYS ADOUR, Pau, France
-
- Amouroux, D. (författare)
- Institut des Sciences Analytiques et de Physico-chimie pour l ’ Environnement et les Materiaux, CNRS/UNIV PAU & PAYS ADOUR, Pau, France
-
- Liem-Nguyen, Van, 1986- (författare)
- Umeå universitet,Örebro universitet,Institutionen för naturvetenskap och teknik,Department of Chemistry, Umeå University, Umeå, Sweden,Kemiska institutionen,School of Science and Technology, Örebro University, Örebro, Sweden
-
- Björn, Erik (författare)
- Umeå universitet,Kemiska institutionen
-
visa färre...
-
(creator_code:org_t)
- American Geophysical Union (AGU), 2018
- 2018
- Engelska.
-
Ingår i: Global Biogeochemical Cycles. - : American Geophysical Union (AGU). - 0886-6236 .- 1944-9224. ; 32:10, s. 1498-1513
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
https://urn.kb.se/re...
-
visa färre...
Abstract
Ämnesord
Stäng
- Oxygen-depleted areas are spreading in coastal and offshore waters worldwide, but the implication for production and bioaccumulation of neurotoxic methylmercury (MeHg) is uncertain. We combined observations from six cruises in the Baltic Sea with speciation modeling and incubation experiments to gain insights into mercury (Hg) dynamics in oxygen depleted systems. We then developed a conceptual model describing the main drivers of Hg speciation, fluxes, and transformations in water columns with steep redox gradients. MeHg concentrations were 2-6 and 30-55 times higher in hypoxic and anoxic than in normoxic water, respectively, while only 1-3 and 1-2 times higher for total Hg (THg). We systematically detected divalent inorganic Hg (Hg-II) methylation in anoxic water but rarely in other waters. In anoxic water, high concentrations of dissolved sulfide cause formation of dissolved species of Hg-II: HgS2H(aq)- and Hg (SH)(2)(0)((aq)). This prolongs the lifetime and increases the reservoir of Hg-II readily available for methylation, driving the high MeHg concentrations in anoxic zones. In the hypoxic zone and at the hypoxic-anoxic interface, Hg concentrations, partitioning, and speciation are all highly dynamic due to processes linked to the iron and sulfur cycles. This causes a large variability in bioavailability of Hg, and thereby MeHg concentrations, in these zones. We find that zooplankton in the summertime are exposed to 2-6 times higher MeHg concentrations in hypoxic than in normoxic water. The current spread of hypoxic zones in coastal systems worldwide could thus cause an increase in the MeHg exposure of food webs.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- mercury
- methylmercury
- anoxia
- hypoxia
- methylation
- redoxcline
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas