Automated Time-Series Sampling of Seawater for Natural Radionuclides

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The objectives of this project are (1) to develope the capability to sample seawater automatically, with moored in-situ pumping systems, for dissolved and particulate forms of the natural radionuclides 210Pb, 210Po, and 234Th; (2) to apply this new capability to obtain a year-long time series of the radionuclide concentrations during the Shelf-Edge Exchange Processes (SEEP) program over the outer continental shelf and upper continental slope; and (3) to use the data to test a time-dependent chemical transport model. This work will advance our ability to sample the oceanic water column and our understanding of the transport of reactive chemical species in the marine environment.