Isotope tracing of submarine groundwater discharge offshore Ubatuba, Brazil: results of the IAEA–UNESCO SGD project

Isotope tracing of submarine groundwater discharge offshore Ubatuba, Brazil: results of the IAEA-UNESCO SGD project.

Results of groundwater and seawater analyses for radioactive (3H, 222Rn, 223Ra, 224Ra, 226Ra, and 228Ra) and stable (D and 18O) isotopes are presented together with in situ spatial mapping and time series 222Rn measurements in seawater, direct seepage measurements using manual and automated seepage meters, pore water investigations using different tracers and piezometric techniques, and geoelec...

Submarine Groundwater Discharge ( Sgd ) Extrapolation for Port Jefferson Harbor

Groundwater typology is a method which is intended to address the relative lack of submarine groundwater discharge (SGD) data on a global basis. On the local scale, a typology was developed for Port Jefferson Harbor with the ultimate goal of scaling nitrates additions to the Long Island Sound. SGD measurements at one location in the south-east side of the Harbor were extrapolated around the sho...

Investigation of submarine groundwater discharge

Coastal hydrogeologists and oceanographers now recognize the potentially significant contribution that submarine groundwater discharge (SGD) could make to the coastal ocean. SGD may be both volumetrically and chemically important to coastal water and chemical budgets. A worldwide compilation of observed SGD shows that groundwater seepage from the land to the ocean occurs in many environments al...

Evaluation of nitrate fluxes into a coastal lagoon through Submarine Groundwater Discharge (SGD)

Nitrogen biogeochemistry of submarine groundwater discharge

To investigate the role of the seepage zone in transport, chemical speciation, and attenuation of nitrogen loads carried by submarine groundwater discharge, we collected nearshore groundwater samples (n 5 328) and examined the distribution and isotopic signature (d15N) of nitrate and ammonium. In addition, we estimated nutrient fluxes from terrestrial and marine groundwater sources. We discuss ...