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. Mercury (Hg) contamination is ubiquitous. In order to assess its emissions,transport, atmospheric reactivity, and deposition pathways, worldwide Hgmonitoring has been implemented over the past 10–20 years, albeit with onlya few stations in the Southern Hemisphere. Consequently, little is known aboutthe relative contribution of marine and terrestrial Hg sources, which isimportant in the context of growing interest in effectiveness evaluation ofHg mitigation policies. This paper constitutes Part 2 of the studydescribing a decade of atmospheric Hg concentrations at Cape Point, SouthAfrica, i.e. the first long-term (&gt; 10 years) observations in theSouthern Hemisphere. Building on the trend analysis reported in Part 1, herewe combine atmospheric Hg data with a trajectory model to investigatesources and sinks of Hg at Cape Point. We find that the continent is themajor sink, and the ocean, especially its warm regions (i.e. the AgulhasCurrent), is the major source for Hg. Further, we find that mercury concentrations and trends from long-rangetransport are independent of the source region (e.g. South America,Antarctica) and thus indistinguishable. Therefore, by filtering out airmasses from source and sink regions we are able to create a datasetrepresenting a southern hemispheric background Hg concentrations. Based onthis dataset, we were able to show that the interannual variability in Hgconcentrations at Cape Point is not driven by changes in atmosphericcirculation but rather due to changes in global emissions (gold mining andbiomass burning).

Atmospheric mercury in the Southern Hemisphere – Part 2: Source apportionment analysis at Cape Point station, South Africa