Trend and seasonal variation of atmospheric mercury concentrations at the Cape Point GAW observatory, South AfricaE.-G. Brunke, R. Ebinghaus, H. H. Kock, A. Weigelt, C. Labuschagne and F. SlemrE3S Web of Conferences, 1 (2013) 17002DOI: https://doi.org/10.1051/e3sconf/20130117002