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Article Dans Une Revue Nature Communications Année : 2023

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

Fange Yue
  • Fonction : Auteur
Byron Blomquist
  • Fonction : Auteur
Julia Schmale
Clara J M Hoppe
Ruibo Lei
  • Fonction : Auteur
Matthew D Shupe
Liyang Zhan
  • Fonction : Auteur
Jian Ren
Hailong Liu
  • Fonction : Auteur
Ivo Beck
  • Fonction : Auteur
Dean Howard
  • Fonction : Auteur
Tuija Jokinen
Tiia Laurila
  • Fonction : Auteur
Lauriane L J Quéléver
  • Fonction : Auteur
Matthew Boyer
  • Fonction : Auteur
Tuukka Petäjä
Stephen D Archer
Detlev Helmig
  • Fonction : Auteur
Jacques Hueber
  • Fonction : Auteur
Kevin Posman
  • Fonction : Auteur
Zhouqing Xie

Résumé

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.
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Dates et versions

hal-04292742 , version 1 (20-11-2023)

Identifiants

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Fange Yue, Hélène Angot, Byron Blomquist, Julia Schmale, Clara J M Hoppe, et al.. The Marginal Ice Zone as a dominant source region of atmospheric mercury during central Arctic summertime. Nature Communications, 2023, 14 (1), pp.4887. ⟨10.1038/s41467-023-40660-9⟩. ⟨hal-04292742⟩
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