From: Subject: Mercury Sources and Species in Waquoit Bay and Other Cape Cod Massachusetts Wate Date: Thu, 10 Sep 2009 13:08:33 -0400 MIME-Version: 1.0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Location: http://adsabs.harvard.edu/abs/2008AGUFM.B13C0460A X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 =EF=BB=BF Mercury Sources and Species in Waquoit Bay and Other = Cape Cod Massachusetts Wate
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Title:
Mercury Sources and Species in Waquoit = Bay and=20 Other Cape Cod Massachusetts Water Bodies
Authors:
= Abbott, A. N.;=20 Lam= borg, C.;=20 Marti= n, W.;=20 C= harette, M.;=20 Bone,&nbs= p;S.;=20 Bot= hner, M.;=20 D= revnick, P.
Affiliation:
AA(Hobart and William Smith Colleges, = Pultney=20 Street, Geneva, NY 14456, United States ; ), AB(Woods Hole Oceanographic Institute, Water Street, = Woods=20 Hole, MA 02543, United States ; ), AC(Woods Hole Oceanographic Institute, Water Street, = Woods=20 Hole, MA 02543, United States ; ), AD(Woods Hole Oceanographic Institute, Water Street, = Woods=20 Hole, MA 02543, United States ; ), AE(University of California, Berkeley, UC Berkeley, = Berkeley,=20 CA 94720, United States ; ), AF(U.S. Geological Survey, Woods Hole Science Center, = Woods=20 Hole, MA 02543, United States ; ), AG(Woods Hole Oceanographic Institute, Water Street, = Woods=20 Hole, MA 02543, United States ; )
Publication:
American Geophysical Union, Fall = Meeting 2008,=20 abstract #B13C-0460
Publication Date:
12/2008
Origin:
AGU
AGU Keywords:
0330 Geochemical cycles (1030), 0489 = Trace=20 element cycling (4875), 1050 Marine geochemistry (4835, 4845, = 4850), 4217=20 Coastal processes, 4825 Geochemistry
Abstract Copyright:
(c) 2008: American Geophysical = Union
Bibliographic Code:
2008AGUFM.B13C0460A

Abstract

Previous work in Waquoit Bay, = Massachusetts (USA),=20 has found high concentrations of dissolved mercury (Hg) in bay water and = implicated groundwater as a potentially important source of this toxic = metal to=20 that coastal ecosystem (Bone et al., 2007). On-going research is testing = this=20 hypothesis by examining the spatial distribution and temporal = variability of Hg=20 within the subterranean estuary, the open water of Waquoit Bay, and in = selected=20 water bodies elsewhere on Cape Cod. Survey sampling indicated that = Waquoit Bay=20 was unusually elevated in total dissolved Hg concentration when compared = to=20 Vineyard Sound, fresh ponds within its watershed and nearby tidal salt = ponds.=20 This suggests that groundwater and diffusion from sediments are key = sources of=20 Hg to Bay waters. Watershed Hg transfer efficiencies, calculated by = comparing=20 rain fluxes measured at the Cape Cod National Seashore Coastal Lab = (MA01) with=20 groundwater fluxes at the head of Waquoit Bay, are typical of other = temperate=20 systems but lower than those estimated previously for this site. = Furthermore,=20 while the total Hg concentrations of local sands and soils from around = Cape Cod=20 are often very small and strongly a function of organic carbon (as = determined by=20 LOI), the partition coefficients (Kd) were not unusually low. This = potentially=20 contradicts our hypothesis that the cause of high Hg concentrations in = the Bay=20 are the result of little retention of Hg within the watershed compared = to other=20 temperate systems. In addition to total Hg studies, monomethyl Hg (MMHg) = fluxes=20 into the Bay with advecting groundwater are being determined. The flux = with=20 groundwater will be compared to the flux of mmHg generated in surficial=20 sediments of the central bay, less affected by groundwater, and released = via=20 diffusion and/or tidal pumping.=20
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