The Marginal Ice Zone as a dominant source region of atmospheric mercury during central Arctic summertime.

Autor: Yue F; Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China., Angot H; Extreme Environments Research Laboratory, École Polytechnique Fédérale de Lausanne (EPFL) Valais Wallis, Sion, Switzerland. helene.angot@univ-grenoble-alpes.fr.; Institute for Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, Boulder, CO, USA. helene.angot@univ-grenoble-alpes.fr.; Univ. Grenoble Alpes, CNRS, INRAE, IRD, Grenoble INP, IGE, 38000, Grenoble, France. helene.angot@univ-grenoble-alpes.fr., Blomquist B; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.; NOAA, Physical Sciences Laboratory, Boulder, CO, USA., Schmale J; Extreme Environments Research Laboratory, École Polytechnique Fédérale de Lausanne (EPFL) Valais Wallis, Sion, Switzerland., Hoppe CJM; Alfred Wegener Institut-Helmholtzzentrum für Polar- und Meeresforschung, Am Handelshafen 12, 27570, Bremerhaven, Germany., Lei R; Key Laboratory for Polar Science of the MNR, Polar Research Institute of China, Shanghai, China., Shupe MD; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.; NOAA, Physical Sciences Laboratory, Boulder, CO, USA., Zhan L; Third Institute of Oceanography, Ministry of natural resources, Xiamen, China., Ren J; Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, 310012, China., Liu H; School of Oceanography, Shanghai Jiao Tong University, Shanghai, 200030, China., Beck I; Extreme Environments Research Laboratory, École Polytechnique Fédérale de Lausanne (EPFL) Valais Wallis, Sion, Switzerland., Howard D; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.; NOAA, Physical Sciences Laboratory, Boulder, CO, USA., Jokinen T; Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland.; Climate & Atmosphere Research Centre (CARE-C), The Cyprus Institute, Nicosia, Cyprus., Laurila T; Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland., Quéléver L; Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland., Boyer M; Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland., Petäjä T; Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland., Archer S; Bigelow Laboratory for Ocean Sciences, Boothbay, ME, USA., Bariteau L; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.; NOAA, Physical Sciences Laboratory, Boulder, CO, USA., Helmig D; Boulder Atmosphere Innovation Research, Boulder, CO, USA., Hueber J; JH Atmospheric Instrumentation Design, Boulder, CO, USA., Jacobi HW; Univ. Grenoble Alpes, CNRS, INRAE, IRD, Grenoble INP, IGE, 38000, Grenoble, France., Posman K; Bigelow Laboratory for Ocean Sciences, Boothbay, ME, USA., Xie Z; Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China. zqxie@ustc.edu.cn.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Aug 14; Vol. 14 (1), pp. 4887. Date of Electronic Publication: 2023 Aug 14.
DOI: 10.1038/s41467-023-40660-9
Abstrakt: Atmospheric gaseous elemental mercury (GEM) concentrations in the Arctic exhibit a clear summertime maximum, while the origin of this peak is still a matter of debate in the community. Based on summertime observations during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition and a modeling approach, we further investigate the sources of atmospheric Hg in the central Arctic. Simulations with a generalized additive model (GAM) show that long-range transport of anthropogenic and terrestrial Hg from lower latitudes is a minor contribution (~2%), and more than 50% of the explained GEM variability is caused by oceanic evasion. A potential source contribution function (PSCF) analysis further shows that oceanic evasion is not significant throughout the ice-covered central Arctic Ocean but mainly occurs in the Marginal Ice Zone (MIZ) due to the specific environmental conditions in that region. Our results suggest that this regional process could be the leading contributor to the observed summertime GEM maximum. In the context of rapid Arctic warming and the observed increase in width of the MIZ, oceanic Hg evasion may become more significant and strengthen the role of the central Arctic Ocean as a summertime source of atmospheric Hg.
(© 2023. Springer Nature Limited.)
Databáze: MEDLINE
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