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Bogs can store large amounts of lead (Pb) and arsenic (As) fromatmospheric deposition of anthropogenic emissions. Pb and As are exportedalong with dissolved organic carbon (DOC) from these organic-rich systems,but it is not yet clear which hydrological (pre)conditions favor theirexport. This study combines a 1-year monitoring of precipitation, bogwater level and pore water concentration changes with bog discharge and DOC,iron, As and Pb stream concentrations. From these data, annual DOC, As, and Pbexports were calculated. Concentrations ranged from 5 to 30 mg L−1 for DOC, 0.2 to 1.9 μg L−1 for As,and 1.3 to 12 μg L−1 for Pb, with highestconcentrations in late summer. As and Pb concentrations significantlycorrelated with DOC concentrations. Fluxes depended strongly on discharge,as 40 % of As and 43 % of Pb were exported during 10 % of the time withthe highest discharge, pointing out the over-proportional contribution ofshort-time, high-discharge events to annual As, Pb and DOC export.Exponential increase in element export from the bog is explained byconnection of additional DOC, As and Pb pools in the acrotelm during watertable rise, which is most pronounced after drought. Pb, As and DOCconcentrations in pore water provide evidence of an increase in the solublePb pool as soon as the peat layer becomes hydrologically connected, while DOCand As peak concentrations in runoff lag behind in comparison to Pb. Ourdata indicate a distinct bog-specific discharge threshold of 8 L s−1,which is thought to depend mainly on the bogs size and drainage conditions.Above this threshold, element concentrations do not further increase anddischarge becomes diluted. Combining pore water and discharge data shows thatAs and Pb exports are dependent on not only the amount of precipitation anddischarge but also on the frequency and depth of water table fluctuations.Comparing the annual bog As and Pb export with element inventories indicatesthat As is much more mobilized than Pb, with annual fluxes accounting for0.85 and 0.27 ‰ of total As and Pbinventory, respectively

biogeosciences

Hydrologic controls on DOC, As and Pb export from a polluted peatland – the importance of heavy rain events, antecedent moisture conditions and hydrological connectivity