Extended Data Fig. 1: Summary of marine Hg(ii) deposition and Hg(0) air-sea exchange fluxes.
From: Mercury stable isotopes constrain atmospheric sources to the ocean
Gross fluxes (solid arrows, Mg y−1) are based on published model estimates3. Hg(0) exchange is bidirectional, meaning that despite surface ocean Hg(0) supersaturation and large Hg(0) evasion, Hg(0) invasion is substantial. Marine Δ200Hg signatures of 0.04‰ indicate a relatively more important contribution of the atmospheric Hg(0) end-member to marine Hg than current 3D models suggest. This indicates that either 3D model Hg(ii) deposition is overestimated or that Hg(0) invasion is underestimated (black dotted arrows, indicating 2–3 times lower or 2–3 times higher fluxes, required to fit Δ200Hg data).
