Mercury in the free troposphere and bidirectional atmosphere-vegetation exchanges – insights from maïdo mountain observatory in the southern hemisphere tropics

HIGHLIGHTS

SUMMARY

    Hg redox chemistry in the atmosphere is still subject to considerable uncertainties, and the debate on the dominant Hg oxidants in the atmosphere has been ongoing for more than 2 decades (Lin, 2011; Ariya et_al, 2008; Lindberg et_al, 2007; Dibble et_al, 2020; Calvert and Lindberg, 2005; Lindqvist and Rodhe, 1985). Indeed, the widely used mercury simulation of the GEOS-Chem chemical transport model (Selin et_al, 2007) employed in recent versions a two-step Br-initiated pathway as the main Hg0 oxidation pathway (Horowitz et_al, 2017; Feinberg et_al, 2022). The local atmospheric circulation of R . . .

     

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