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Analysis of Submarine Groundwater Discharge and Radium Fluxes to the Atlantic Ocean

This study estimates the submarine groundwater discharge (SGD) to the Atlantic Ocean while focusing on the flux of 228Ra. Utilizing a half-life of 5.7 years, we measure the inventory of 228Ra in the upper kilometer of the ocean, calculating SGD flux based on inventory and decay rates. The mean and median concentrations of 228Ra in SGD are derived from 226 samples, resulting in a total inventory of 2.9 x 10^24 atoms. This research highlights the interplay of riverine and sediment contributions to 228Ra flux and its implications for oceanic geochemical cycles.

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Analysis of Submarine Groundwater Discharge and Radium Fluxes to the Atlantic Ocean

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  1. Estimate Submarine Groundwater Discharge (SGD)to the Atlantic Ocean 232Th 228Ra half life = 5.7 years l = 0.12 yr-1 Procedure: 1. Measure inventory of 228Ra in upper km of Atlantic Ocean. Flux 228Ra = Inventory x l 2. Subtract riverine and sediment fluxes. 3. Estimate 228Ra in SGD. TTO 1981-1989 228Ra flux (atoms) SGD Flux = [228Ra]SGD (at/L) Bob Key Princeton

  2. Distribution of 228Ra in SGD (226 samples) median mean Median = 6.5 x 106 at/L Mean = 17 x 106 at/L (3.9 dpm/L) (1.5 dpm/L)

  3. Total 228Ra Inventory = 2.9 x 1024 atoms Decay = 3.5 x 1023 at/yr River flux = 0.3 x 1023 at/yr Sed. flux = 1.3 x 1023 at/yr SGD flux = 1.9 x 1023 at/yr TTO 1981-1989 Mean 228Ra in SGD = 17 x 106 at/L (3.9 dpm/L) Median 228Ra in SGD = 6.5 x 106 at/L (1.5 dpm/L) SGD flux = 1-3 x 1016 L/yr River flux = 2.4 x 1016 L/yr 40-120% of the river water flux; probably >>river metal, nut, C flux

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