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| B33: | Mercury Cycling in Ecosystems: Importance of Hot Spots and Hot Moments |
| Sponsor: |
Biogeosciences
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| Convener: |
Douglas A. Burns U.S. Geological Survey 425 Jordan Rd. Troy, NY, USA 518-285-5662 daburns@usgs.gov James B. Shanley U.S. Geological Survey Montpelier, VT, USA 802-828-4466 jshanley@usgs.gov |
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0414 0483 0497 1890 .
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| Description: | Research on the mercury (Hg) cycle has identified wetlands and riparian areas as hot spots for methylation, and high-flow events as hot moments for transport of Hg and methyl Hg (MeHg), yet the connection between hot spots and hot moments is not well appreciated. Within wetlands, the interface with upland areas favors both the accumulation and methylation of Hg. Additionally, differences in wetland topography, hydrologic flow paths, sulfate availability, and other factors can favor some wetland areas as greater Hg and MeHg sources than others. Hot spots of Hg storage and methylation do not necessarily correspond to the dominant sources of Hg species to aquatic ecosystems. Such factors as flushing frequency by snowmelt and large storms, fluctuating water tables, hydraulic conductivity of soils, and upward hydrologic gradients through peaty wetland soils all can potentially merge hot spots with hot moments of Hg and MeHg transport to surface waters. In this session, we seek contributions from studies that have addressed these hot spot/hot moment ideas as a means of improving our conceptual models of the link between the terrestrial and aquatic cycles of Hg. |
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