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Mercury dynamics in a San Francisco estuary tidal wetland : assessing dynamics using in situ measurements

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dc.contributor.author Bergamaschi, Brian A.
dc.contributor.author Fleck, Jacob A.
dc.contributor.author Downing, Bryan D.
dc.contributor.author Boss, Emmanuel S.
dc.contributor.author Pellerin, Brian A.
dc.contributor.author Ganju, Neil K.
dc.contributor.author Schoellhamer, David H.
dc.contributor.author Byington, Amy A.
dc.contributor.author Heim, Wesley A.
dc.contributor.author Stephenson, Mark
dc.contributor.author Fujii, Roger
dc.date.accessioned 2012-07-03T16:09:30Z
dc.date.available 2012-07-03T16:09:30Z
dc.date.issued 2012-04-03
dc.identifier.citation Estuaries and Coasts 35 (2012): 1036-1048 en_US
dc.identifier.uri http://hdl.handle.net/1912/5253
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.abstract We 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.sponsorship This 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.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher Springer en_US
dc.relation.uri http://dx.doi.org/10.1007/s12237-012-9501-3
dc.rights.uri http://creativecommons.org/licenses/by/3.0/us/ *
dc.subject Mercury en_US
dc.subject Tidal wetlands en_US
dc.subject San Francisco Bay en_US
dc.subject Sacramento River en_US
dc.subject Delta en_US
dc.subject Mercury flux en_US
dc.subject Sediment flux en_US
dc.subject Rivers en_US
dc.subject Wetlands en_US
dc.subject Estuaries en_US
dc.subject Wetland restoration en_US
dc.title Mercury dynamics in a San Francisco estuary tidal wetland : assessing dynamics using in situ measurements en_US
dc.type Article en_US
dc.identifier.doi 10.1007/s12237-012-9501-3


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