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On request from the Norwegian Environment Agency, a survey of atmospheric deposition of heavy metals around industrial enterprises in Norway has been carried out. The participation was voluntary and 22 industries located at 17 different sites financed their own participation. The survey is based on analysis of samples of naturally growing moss collected around the
enterprises during the summer of 2015 and includes 57 different elements. For a majority of the sites this survey is a followup of corresponding surveys carried out in 2000, 2005, and 2010. In general the results show that deposition of heavy metals close to the industries depends closely on the industrial processes used as well as the local topographic and meteorological conditions. The results are evaluated relative to corresponding background levels in moss in parts of Norway with low impact of air pollution. Like in previous surveys, the generally most polluted industrial location is Mo i Rana, followed by Odda. At most sites only minor general improvement is observed since the previous survey in 2010.
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American Geophysical Union (AGU)
2018
2017
2012
Mesospheric intrusion and anomalous chemistry during and after a major stratospheric sudden warming.
2011
Mesosphere-stratosphere transport during Southern Hemisphere autumn deduced from MIPAS observations.
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2017
Mercury isotope evidence for Arctic summertime re-emission of mercury from the cryosphere
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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