Submarine Discharge of Nitrate Rich Groundwater into Port Jefferson Harbor, Long Island, NY
نویسندگان
چکیده
The fate of nitrogen entering Long Island Sound Embayments is dependent on both volume of submarine groundwater discharge (SGD) and geochemical transformations in the coastal aquifer. Previous work in Stony Brook Harbor revealed the importance of sediment composition in the subtidal and offshore areas of the harbor; SGD rate in the subtidal is higher than offshore areas, but experiences only 30-50% denitrification when compared to low SGD rates offshore that undergo 80-100% denitrification. In this study, SGD nitrogen loading to Port Jefferson is examined on the harbor wide scale using a combination of porewater profiles in the coastal aquifer, porewater nitrogen sampling in the subtidal zone and 222 Rn surves. We find nitrate rich groundwater entering Port Jefferson Harbor via shoreline SGD contributes 19 29.4 kg-NO3 -N d -1 , in excess of inputs from Port Jefferson Sewage Treatment Plant which average 12.2kg-Nd -1 . This finding illustrates the importance of accounting for SGD when determining total nitrogen loading to harbor water. To accurately model SGD nitrogen loading to harbors, data refinement is required to address variation in both SGD rates and groundwater nitrate concentration.
منابع مشابه
Submarine Groundwater Discharge ( Sgd ) Extrapolation for Port Jefferson Harbor
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