Assessing land–ocean connectivity via submarine groundwater discharge (SGD) in the Ria Formosa Lagoon (Portugal): combining radon measurements and stable isotope hydrology

Evaluation of eutrophication in the Ria Formosa coastal lagoon, Portugal

The Ria Formosa is a shallow mesotidal lagoon on the south coast of Portugal, with natural biogeochemical cycles essentially regulated by tidal exchanges at the seawater boundaries and at the sediment interface. Existing data on nutrients in the water column and the sediment, together with chlorophyll a and oxygen saturation in the water column, are compared using different models for assessing...

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

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...

Temperature and salinity regimes in a shallow, mesotidal lagoon, the Ria Formosa, Portugal

In a recent study of the mesotidal Ria Formosa, a coastal lagoon in southern Portugal, water temperature in the channels ranged from 12 C in winter to 27 C in summer and salinity from 13 to 36.5, although much higher values were observed in saltpans. Conditions in the Ria Formosa were not homogeneous despite a large tidal exchange of water; the inner channels of the Ria Formosa were brackish in...