Groundwater seepage in the marine environment. Role for mass flux and bacterial activity.

Bussmann, I., Dando, P. R. , Niven, S. J. and Suess, Erwin (1999) Groundwater seepage in the marine environment. Role for mass flux and bacterial activity. Open Access Marine Ecology Progress Series, 178 . pp. 169-177. DOI 10.3354/meps178169.

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In Eckernförde Bay (western Baltic Sea) pockmark structures are induced by groundwater seeping out of the sediment. On 3 occasions in winter and spring 1993-94 we investigated the influence of groundwater on the reduction of salinity, on porewater chemistry, and on bacterial activities (methane oxidation and sulphate reduction). In 2 out of 3 sampling campaigns groundwater discharge could be detected. The concentration gradients of Cl- and SO4= are moved towards the sediment surface by the vertical advection of groundwater during seep times. Without groundwater discharge the porewater chemistry resembled the control site. Compared to the control site, the methane oxidation and sulphate reduction rates were elevated at the pockmark site, reaching maximum values of 49 and 269 µmol l-1 d-1 respectively. The groundwater venting from the pockmark had an end member composition of 80 mM Na+, 1.0 mM Ca++ and was depleted in Mg++. Due to mixing of these major cations along the groundwater/seawater interface, no CaCO3 precipitation was found around the pockmark site.

Document Type: Article
Keywords: Eckernförde Bay; Methane oxidation rate; Sulphate reduction rate; Baltic Sea; Salinity; Sediments
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry
OceanRep > Geomar Research Center for Marine Geosciences
Refereed: Yes
Open Access Journal?: No
Publisher: Inter Research
Projects: Boknis Eck, SFB313
Date Deposited: 18 Feb 2008 17:24
Last Modified: 08 May 2018 11:26

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