Radium isotopes are powerful proxies in oceanography and hydrology. mass balance models, including assessments of submarine groundwater discharge (SGD), often overlook particle scavenging (PS) as a pathway for dissolved radium removal from the world ocean. Here, we build global ocean 226Ra model reevaluate potential importance PS. We find that PS is major sink upper ocean, removing about 96% to...

Radium has been commonly used as a tracer of submarine groundwater discharge to the ocean and embankments, radium activities are input into box models calculate flux. Similarly, isotopes (Ra224, Ra223, Ra226, Ra228) have water mass ages, which proxy for residence times. Less commonly, other tracers utilized in mixing determine relative contribution marine system. In literature, all these method...

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...

"Data on the o1dest obtainable uranium leads from »1inerals unaltered as far as possible are especially desirable, to test the applicability of the actinium D: radium G ratio formula beyond a billion years. (The Manitoba uraninitc, for instance, discovered by H. V. Ellsworth, with a lead/ uranium=0. 27 should prove worth while. ) Ihey might also be interesting in another respect: In case the ex...

Short-lived radium isotopes (223Ra and 224Ra) are used to investigate the potential association between groundwater discharge and microbial pollution at Huntington Beach, CA. We establish the tidally driven exchange of groundwater from the surficial beach aquifer across the beach face. Groundwater is found to be a source of nutrients (silica, inorganic nitrogen, and orthophosphate) to the surf ...

One of the persistent uncertainties in establishing marine geochemical mass balances is evaluating the influence of submarine groundwater discharge (SGD) into the ocean. Our long-term goal is to develop geochemical tools (e.g., radon and radium isotopes) to quantify the magnitude of SGD on a local to regional scale. Improvements in field-based analytical devises is also sought in order to allow...