Evaluating atmospheric mercury (Hg) uptake by vegetation in a chemistry-transport model.

Atmospheric Hg 0 observations from Chacaltaya, a mountain-top observatory in the Bolivian Andes, showed an increasing trend between normal (July 2014–May 2015) and El-Niño Southern Oscillation (ENSO) conditions (June 2015–February 2016). 67 We focus our comparison on normal conditions at Chacaltaya, since the Hg 0 ocean emissions in GEOS-Chem would not be representative of ENSO conditions. 2 In general, Hg concentrations measured in stations surrounded by tropical rainforest (Manaus, Suriname, and Chacaltaya) are all overestimated by the BASE version of GEOS-Chem (BASE mean over stations: 1.27 ng m −3 vs. observed mean: 1.03 ng m −3 ).

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