Figure 2

Estimated concentrations of mb-SO₄²⁻ and nmb-SO₄²⁻. (a) Dome C and (b) Dumont d’Urville with assuming δ³⁴S_nmb = 2.5‰. Dotted lines represent the ranges of the uncertainty (standard error) for [SO₄²⁻]_nmb propagated from the analytical error of concentrations and δ³⁴S values.