Marine mercury, from atmospheric Hg0 /HgII deposition, threatens ecosystems. Isotope studies proposed 1:1 HgII/Hg0 ratios but ignored spatial variability. Here, a 3D isotope model reveals HgII deposition exceed Hg0 by >2:1, revising mercury budgets.
- Zhengcheng Song
- Shaojian Huang
- Yanxu Zhang