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FLEXPART (18, 19) simulation-based sensitivity of the (A) AN and (B) NG ice core records to lead emissions and (C) their ratio. The ∼8-fold higher lead deposition observed in the AN record compared with the NG composite (Fig. 1) is consistent with the 2- to 12-times higher sensitivity to European emissions in the AN/NG ratio, indicating that lead pollution in the Arctic array was dominated by European emissions before the Industrial Revolution.
