Mercury stable isotopes constrain atmospheric sources to the ocean

Jiskra, Martin; Heimbürger‐Boavida, Lars‐Eric; Desgranges, Marie-Maëlle; Petrova, Mariia V.; Dufour, Aurélie; Ferreira-Araujo, Beatriz; Masbou, Jérémy; Chmeleff, Jérôme; Thyssen, Mélilotus; Point, David; Sonke, Jeroen E.

doi:10.1038/s41586-021-03859-8

Cited by 118 publications

(164 citation statements)

References 54 publications

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“… Location of the three atmospheric research stations Alert (83°N, ALT), Villum (82°N, VRS), and Zeppelin (79°N, ZEP), and the city of Igarka, where the Yenisei River (YEN) was sampled (triangle symbols). Also shown are the surface Arctic Ocean ( a ) particulate Hg δ 202 Hg, ( b ) particulate Hg Δ 199 Hg and (c ) particulate Hg Δ 200 Hg signatures (pHg, in ‰, round symbols) from the central basin and Barents Sea (this study) and from Fram Strait 60 . The figure was created using Ocean Data View 80 with permission from Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research (AWI) ( https://odv.awi.de/ ).…”

Section: Introductionmentioning

confidence: 99%

Mercury isotope evidence for Arctic summertime re-emission of mercury from the cryosphere

et al. 2022

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During Arctic springtime, halogen radicals oxidize atmospheric elemental mercury (Hg0), which deposits to the cryosphere. This is followed by a summertime atmospheric Hg0 peak that is thought to result mostly from terrestrial Hg inputs to the Arctic Ocean, followed by photoreduction and emission to air. The large terrestrial Hg contribution to the Arctic Ocean and global atmosphere has raised concern over the potential release of permafrost Hg, via rivers and coastal erosion, with Arctic warming. Here we investigate Hg isotope variability of Arctic atmospheric, marine, and terrestrial Hg. We observe highly characteristic Hg isotope signatures during the summertime peak that reflect re-emission of Hg deposited to the cryosphere during spring. Air mass back trajectories support a cryospheric Hg emission source but no major terrestrial source. This implies that terrestrial Hg inputs to the Arctic Ocean remain in the marine ecosystem, without substantial loss to the global atmosphere, but with possible effects on food webs.

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Section: Introductionmentioning

confidence: 99%

Mercury isotope evidence for Arctic summertime re-emission of mercury from the cryosphere

et al. 2022

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“…In AMAZON_U, the increased ux of Hg 0 dry deposition and reduced uxes of Hg 2+ deposition (À1118 Mg per year, À19% compared to BASE) helps resolve part of the model bias identied in isotopic D 200 Hg mass balance studies. 29,84 The enhanced role of the land sink in the improved version of GEOS-Chem highlights the importance of considering biosphere-atmosphere feedbacks during climate change in future projections of Hg pollution. Our study also emphasizes the necessity of expanding litterfall monitoring as a lower bound estimate for the magnitude Hg 0 uptake and conducting additional ux tower studies in different biomes to monitor net ecosystem exchange.…”

Section: Papermentioning

confidence: 99%

Evaluating atmospheric mercury (Hg) uptake by vegetation in a chemistry-transport model

Feinberg

Dlamini

Jiskra

et al. 2022

Environ. Sci.: Processes Impacts

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“…A large range of human activities result in emissions of mercury to the atmosphere, predominantly (80%–90%) as elemental mercury (Hg 0 ) (AMAP/UN, 2019 ; Gustin et al., 2015 ), characterized by a low chemical reactivity. Atmospheric mercury deposits to ecosystems after oxidation to form water‐soluble Hg I,II species (Horowitz et al., 2017 ) as well as in elemental form (Jiskra et al., 2021 ). Therefore, understanding the atmospheric mercury cycling between Hg 0 and oxidized monovalent Hg I and divalent Hg II forms is key for accurate assessments of its global transport and input into ecosystems via surface deposition.…”

Section: Introductionmentioning

confidence: 99%

The Chemistry of Mercury in the Stratosphere

Saiz‐Lopez

Acuña

Mahajan

et al. 2022

Geophysical Research Letters

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Mercury (Hg) is a neurotoxin with a long lifetime in the Earth system, which exchanges between the atmosphere, continents, and oceans (Driscoll et al., 2013;Lyman et al., 2020; Obrist et al., 2018). A large range of human activities result in emissions of mercury to the atmosphere, predominantly (80%-90%) as elemental mercury (Hg 0 ) (AMAP/ UN, 2019;Gustin et al., 2015), characterized by a low chemical reactivity. Atmospheric mercury deposits to ecosystems after oxidation to form water-soluble Hg I,II species (Horowitz et al., 2017) as well as in elemental form (Jiskra et al., 2021). Therefore, understanding the atmospheric mercury cycling between Hg 0 and oxidized monovalent Hg I and divalent Hg II forms is key for accurate assessments of its global transport and input into ecosystems via surface deposition. In current mechanistic and modeling research it is assumed that only highly reactive bromine atoms (Br) or radicals (OH) can initiate the oxidative chain of gas-phase ambient mercury (

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Mercury stable isotopes constrain atmospheric sources to the ocean

Cited by 118 publications

References 54 publications

Mercury isotope evidence for Arctic summertime re-emission of mercury from the cryosphere

Mercury isotope evidence for Arctic summertime re-emission of mercury from the cryosphere

Evaluating atmospheric mercury (Hg) uptake by vegetation in a chemistry-transport model

The Chemistry of Mercury in the Stratosphere

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