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Long-term measurements of gaseous elemental mercury (GEM) concentrations atCape Point, South Africa, reveal a downward trend between September 1995 andDecember 2005 and an upward one from March 2007 until June 2015, implying achange in trend sign between 2004 and 2007. The trend change isqualitatively consistent with the trend changes in GEM concentrationsobserved at Mace Head, Ireland, and in mercury wet deposition over NorthAmerica, suggesting a change in worldwide mercury emissions.  Seasonally resolved trends suggest a modulation of the overall trend byregional processes. The trends in absolute terms (downward in 1995–2004and upward in 2007–2015) are highest in austral spring (SON),coinciding with the peak in emissions from biomass burning in South Americaand southern Africa. The influence of trends in biomass burning is furthersupported by a biennial variation in GEM concentration found here and anEl Niño–Southern Oscillation (ENSO) signature in GEM concentrations reported recently

Trend of atmospheric mercury concentrations at Cape Point for 1995–2004 and since 2007