Other
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3511807s&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 11, CiteID L11807
Other
14
Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Geochemical Cycles (1030)
Scientific paper
Total gaseous mercury (TGM) has been measured at the WMO Global Atmosphere Watch (GAW) station at Cape Point, South Africa, since September 1995, representing the only long term TGM measurement in the Southern Hemisphere (SH) so far. Annual medians suggest a small but significant decrease of TGM concentrations from 1.29 ng m-3 in 1996 to 1.19 ng m-3 in 2004. Background TGM concentrations at Cape Point varied seasonally, with a summer maximum and a winter minimum. Comparison with the seasonal variation of CO concentrations in both hemispheres calls into question the influence of mercury sink by the Hg0 + OH reaction. If confirmed at other sites in the SH, the observed TGM seasonal variation may pose an important constraint on the global models of atmospheric mercury.
Brunke Ernst-G.
Ebinghaus Ralf
Labuschagne Casper
Slemr Franz
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