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- W188508780 abstract "During summer stratification, dissolved and particulate mercury species reach maxima in oxygen-depleted, sulfide-rich bottom water of a Wisconsin seepage lake. Initially, it appeared that this hypolimnetic build-up was due to redox-controlled release from bottom sediments. However, Hg did not increase near the bottom sediments during winter anoxia, when lakes are sealed from atmospheric inputs and biological productivity is low. In contrast, Fe shows both a summer and winter build-up with depth. Reinterpretation of depth profiles using seston distributions and sediment trap collections suggests that hypolimnetic enrichment may result from the transport of epilimnetic Hg to deeper waters via biotic particles. Furthermore, a preliminary Hg mass balance for the ice-free season shows that atmospheric inputs are the dominant source of Hg to the lakes and that Hg inputs are removed by sedimentation. Mercury-rich biotic particles tend to accumulate in layers at depth through both settling and in situ growth. We hypothesize that recycling of Hg within these deep plankton layers has a strong influence on the distribution and speciation of Hg in these lakes." @default.
- W188508780 created "2016-06-24" @default.
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- W188508780 date "1990-01-09" @default.
- W188508780 modified "2023-09-27" @default.
- W188508780 title "Vertical transport of mercury in a Wisconsin seepage lake" @default.
- W188508780 hasPublicationYear "1990" @default.
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