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dc.contributor.authorBergamaschi, Brian A.  Concept link
dc.contributor.authorFleck, Jacob A.  Concept link
dc.contributor.authorDowning, Bryan D.  Concept link
dc.contributor.authorBoss, Emmanuel S.  Concept link
dc.contributor.authorPellerin, Brian A.  Concept link
dc.contributor.authorGanju, Neil K.  Concept link
dc.contributor.authorSchoellhamer, David H.  Concept link
dc.contributor.authorByington, Amy A.  Concept link
dc.contributor.authorHeim, Wesley A.  Concept link
dc.contributor.authorStephenson, Mark  Concept link
dc.contributor.authorFujii, Roger  Concept link
dc.identifier.citationEstuaries and Coasts 35 (2012): 1036-1048en_US
dc.description© The Author(s), 2012. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Estuaries and Coasts 35 (2012): 1036-1048, doi:10.1007/s12237-012-9501-3.en_US
dc.description.abstractWe used high-resolution in situ measurements of turbidity and fluorescent dissolved organic matter (FDOM) to quantitatively estimate the tidally driven exchange of mercury (Hg) between the waters of the San Francisco estuary and Browns Island, a tidal wetland. Turbidity and FDOM—representative of particle-associated and filter-passing Hg, respectively—together predicted 94 % of the observed variability in measured total mercury concentration in unfiltered water samples (UTHg) collected during a single tidal cycle in spring, fall, and winter, 2005–2006. Continuous in situ turbidity and FDOM data spanning at least a full spring-neap period were used to generate UTHg concentration time series using this relationship, and then combined with water discharge measurements to calculate Hg fluxes in each season. Wetlands are generally considered to be sinks for sediment and associated mercury. However, during the three periods of monitoring, Browns Island wetland did not appreciably accumulate Hg. Instead, gradual tidally driven export of UTHg from the wetland offset the large episodic on-island fluxes associated with high wind events. Exports were highest during large spring tides, when ebbing waters relatively enriched in FDOM, dissolved organic carbon (DOC), and filter-passing mercury drained from the marsh into the open waters of the estuary. On-island flux of UTHg, which was largely particle-associated, was highest during strong winds coincident with flood tides. Our results demonstrate that processes driving UTHg fluxes in tidal wetlands encompass both the dissolved and particulate phases and multiple timescales, necessitating longer term monitoring to adequately quantify fluxes.en_US
dc.description.sponsorshipThis work was supported by funding from the California Bay Delta Authority Ecosystem Restoration and Drinking Water Programs (grant ERP-00- G01) and matching funds from the United States Geological Survey Cooperative Research Program.en_US
dc.rightsAttribution 3.0 United States*
dc.subjectTidal wetlandsen_US
dc.subjectSan Francisco Bayen_US
dc.subjectSacramento Riveren_US
dc.subjectMercury fluxen_US
dc.subjectSediment fluxen_US
dc.subjectWetland restorationen_US
dc.titleMercury dynamics in a San Francisco estuary tidal wetland : assessing dynamics using in situ measurementsen_US

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Attribution 3.0 United States
Except where otherwise noted, this item's license is described as Attribution 3.0 United States