Updated trends for atmospheric mercury in the Arctic: 1995–2018

作者：Katrina MacSween, Geoff W. Stupple, Wenche Aas, Katriina Kyllönen, Katrine Aspmo Pfaffhuber, Henrik Skov, A. Steffen, Torunn Berg, Michelle Nerentorp Mastromonaco · 发表于：The Science of The Total Environment · 年份：2022 · DOI：10.1016/j.scitotenv.2022.155802 · 被引用次数：40 · 研究领域：Mercury impact and mitigation studies、Atmospheric and Environmental Gas Dynamics、Marine animal studies overview

The Arctic region forms a unique environment with specific physical, chemical, and biological processes affecting mercury (Hg) cycles and limited anthropogenic Hg sources. However, historic global emissions and long range atmospheric transport has led to elevated Hg in Arctic wildlife and waterways. Continuous atmospheric Hg measurements, spanning 20 years, and increased monitoring sites has allowed a more comprehensive understanding of how Arctic atmospheric mercury is changing over time. Time-series trend analysis of TGM (Total Gaseous Mercury) in air was performed from 10 circumpolar air monitoring stations, comprising of high-Arctic, and sub-Arctic sites. GOM (gaseous oxidised mercury) and PHg (particulate bound mercury) measurements were also available at 2 high-Arctic sites. Seasonal mean TGM for sub-Arctic sites were lowest during fall ranging from 1.1 ng m −3 Hyytiälä to 1.3 ng m −3 , Little Fox Lake. Mean TGM concentrations at high-Arctic sites showed the greatest variability, with highest daily means in spring ranging between 4.2 ng m −3 at Amderma and 2.4 ng m −3 at Zeppelin, largely driven by local chemistry. Annual TGM trend analysis was negative for 8 of the 10 sites. High-Arctic seasonal TGM trends saw smallest decline during summer. Fall trends ranged from −0.8% to −2.6% yr −1 . Across the sub-Arctic sites spring showed the largest significant decreases, ranging between −7.7% to −0.36% yr −1 , while fall generally had no significant trends. High-Arctic speciat...