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Eurasian river spring flood observations support net Arctic Ocean mercury export to the atmosphere and Atlantic Ocean.
Proc Natl Acad Sci U S A. 2018 12 11; 115(50):E11586-E11594.PN

Abstract

Midlatitude anthropogenic mercury (Hg) emissions and discharge reach the Arctic Ocean (AO) by atmospheric and oceanic transport. Recent studies suggest that Arctic river Hg inputs have been a potentially overlooked source of Hg to the AO. Observations on Hg in Eurasian rivers, which represent 80% of freshwater inputs to the AO, are quasi-inexistent, however, putting firm understanding of the Arctic Hg cycle on hold. Here, we present comprehensive seasonal observations on dissolved Hg (DHg) and particulate Hg (PHg) concentrations and fluxes for two large Eurasian rivers, the Yenisei and the Severnaya Dvina. We find large DHg and PHg fluxes during the spring flood, followed by a second pulse during the fall flood. We observe well-defined water vs. Hg runoff relationships for Eurasian and North American Hg fluxes to the AO and for Canadian Hg fluxes into the larger Hudson Bay area. Extrapolation to pan-Arctic rivers and watersheds gives a total Hg river flux to the AO of 44 ± 4 Mg per year (1σ), in agreement with the recent model-based estimates of 16 to 46 Mg per year and Hg/dissolved organic carbon (DOC) observation-based estimate of 50 Mg per year. The river Hg budget, together with recent observations on tundra Hg uptake and AO Hg dynamics, provide a consistent view of the Arctic Hg cycle in which continental ecosystems traffic anthropogenic Hg emissions to the AO via rivers, and the AO exports Hg to the atmosphere, to the Atlantic Ocean, and to AO marine sediments.

Authors+Show Affiliations

Laboratoire Géosciences Environnement Toulouse, CNRS/Institute for Research and Development/Université Paul Sabatier-Toulouse III, 31400 Toulouse, France; jeroen.sonke@get.omp.eu.EcoLab, Université de Toulouse, CNRS, National Polytechnic Institute, 31400 Toulouse, France.Laboratoire Géosciences Environnement Toulouse, CNRS/Institute for Research and Development/Université Paul Sabatier-Toulouse III, 31400 Toulouse, France. Mediterranean Institute of Oceanography, CNRS, Université de Toulon, Institute for Research and Development, Aix-Marseille Université, 13288 Marseille, France.Mediterranean Institute of Oceanography, CNRS, Université de Toulon, Institute for Research and Development, Aix-Marseille Université, 13288 Marseille, France.Laboratoire Géosciences Environnement Toulouse, CNRS/Institute for Research and Development/Université Paul Sabatier-Toulouse III, 31400 Toulouse, France.EcoLab, Université de Toulouse, CNRS, National Polytechnic Institute, 31400 Toulouse, France.N. Laverov Federal Center for Integrated Arctic Research, Russian Academy of Sciences, 163000 Arkhangelsk, Russia.Laboratoire Géosciences Environnement Toulouse, CNRS/Institute for Research and Development/Université Paul Sabatier-Toulouse III, 31400 Toulouse, France.Environmental Science and Engineering Program, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138.Environmental Science and Engineering Program, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138.EcoLab, Université de Toulouse, CNRS, National Polytechnic Institute, 31400 Toulouse, France. Permafrost Groundwater and Geochemistry Laboratory, Melnikov Permafrost Institute, Siberian Branch, Russian Academy of Sciences, 677010 Yakutsk, Russia.Laboratoire Géosciences Environnement Toulouse, CNRS/Institute for Research and Development/Université Paul Sabatier-Toulouse III, 31400 Toulouse, France. BIO-GEO-CLIM Laboratory, Tomsk State University, 634050 Tomsk, Russia.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

30478039

Citation

Sonke, Jeroen E., et al. "Eurasian River Spring Flood Observations Support Net Arctic Ocean Mercury Export to the Atmosphere and Atlantic Ocean." Proceedings of the National Academy of Sciences of the United States of America, vol. 115, no. 50, 2018, pp. E11586-E11594.
Sonke JE, Teisserenc R, Heimbürger-Boavida LE, et al. Eurasian river spring flood observations support net Arctic Ocean mercury export to the atmosphere and Atlantic Ocean. Proc Natl Acad Sci U S A. 2018;115(50):E11586-E11594.
Sonke, J. E., Teisserenc, R., Heimbürger-Boavida, L. E., Petrova, M. V., Marusczak, N., Le Dantec, T., Chupakov, A. V., Li, C., Thackray, C. P., Sunderland, E. M., Tananaev, N., & Pokrovsky, O. S. (2018). Eurasian river spring flood observations support net Arctic Ocean mercury export to the atmosphere and Atlantic Ocean. Proceedings of the National Academy of Sciences of the United States of America, 115(50), E11586-E11594. https://doi.org/10.1073/pnas.1811957115
Sonke JE, et al. Eurasian River Spring Flood Observations Support Net Arctic Ocean Mercury Export to the Atmosphere and Atlantic Ocean. Proc Natl Acad Sci U S A. 2018 12 11;115(50):E11586-E11594. PubMed PMID: 30478039.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Eurasian river spring flood observations support net Arctic Ocean mercury export to the atmosphere and Atlantic Ocean. AU - Sonke,Jeroen E, AU - Teisserenc,Roman, AU - Heimbürger-Boavida,Lars-Eric, AU - Petrova,Mariia V, AU - Marusczak,Nicolas, AU - Le Dantec,Theo, AU - Chupakov,Artem V, AU - Li,Chuxian, AU - Thackray,Colin P, AU - Sunderland,Elsie M, AU - Tananaev,Nikita, AU - Pokrovsky,Oleg S, Y1 - 2018/11/26/ PY - 2018/11/28/pubmed PY - 2019/2/5/medline PY - 2018/11/28/entrez KW - Arctic KW - mercury KW - modeling KW - ocean KW - rivers SP - E11586 EP - E11594 JF - Proceedings of the National Academy of Sciences of the United States of America JO - Proc Natl Acad Sci U S A VL - 115 IS - 50 N2 - Midlatitude anthropogenic mercury (Hg) emissions and discharge reach the Arctic Ocean (AO) by atmospheric and oceanic transport. Recent studies suggest that Arctic river Hg inputs have been a potentially overlooked source of Hg to the AO. Observations on Hg in Eurasian rivers, which represent 80% of freshwater inputs to the AO, are quasi-inexistent, however, putting firm understanding of the Arctic Hg cycle on hold. Here, we present comprehensive seasonal observations on dissolved Hg (DHg) and particulate Hg (PHg) concentrations and fluxes for two large Eurasian rivers, the Yenisei and the Severnaya Dvina. We find large DHg and PHg fluxes during the spring flood, followed by a second pulse during the fall flood. We observe well-defined water vs. Hg runoff relationships for Eurasian and North American Hg fluxes to the AO and for Canadian Hg fluxes into the larger Hudson Bay area. Extrapolation to pan-Arctic rivers and watersheds gives a total Hg river flux to the AO of 44 ± 4 Mg per year (1σ), in agreement with the recent model-based estimates of 16 to 46 Mg per year and Hg/dissolved organic carbon (DOC) observation-based estimate of 50 Mg per year. The river Hg budget, together with recent observations on tundra Hg uptake and AO Hg dynamics, provide a consistent view of the Arctic Hg cycle in which continental ecosystems traffic anthropogenic Hg emissions to the AO via rivers, and the AO exports Hg to the atmosphere, to the Atlantic Ocean, and to AO marine sediments. SN - 1091-6490 UR - https://www.unboundmedicine.com/medline/citation/30478039/Eurasian_river_spring_flood_observations_support_net_Arctic_Ocean_mercury_export_to_the_atmosphere_and_Atlantic_Ocean_ L2 - http://www.pnas.org/cgi/pmidlookup?view=long&pmid=30478039 DB - PRIME DP - Unbound Medicine ER -