Now showing items 1-10 of 54
Short-term dispersal of Fukushima-derived radionuclides off Japan : modeling efforts and model-data intercomparison
(Copernicus Publications on behalf of the European Geosciences Union, 2013-07-24)
The Great East Japan Earthquake and tsunami that caused a loss of power at the Fukushima nuclear power plants (FNPP) resulted in emission of radioactive isotopes into the atmosphere and the ocean. In June of 2011, an ...
Plutonium isotopes in the North Atlantic
(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-09)
The artificial radionuclide Plutonium (Pu) has been introduced into the environment primarily as fallout from atmospheric nuclear weapons testing during the 1950's and 1960's. Earlier studies of Pu geochemistry are ...
Sinking phytoplankton associated with carbon flux in the Atlantic Ocean
(John Wiley & Sons, 2016-05-04)
The composition of sinking particles and the mechanisms leading to their transport ultimately control how much carbon is naturally sequestered in the deep ocean by the “biological pump.” While detrital particles often ...
Beryllium-7 analyses in seawater by low background gamma-spectroscopy
7Be is a cosmogenic isotope produced in the stratosphere and troposphere. 7Be has a half-life of 53.4 days and decays to 7Li emitting a 477 keV gamma line with a branching ratio of 0.104. It is predominantly washed out of ...
Adsorbers for in-situ collection and at-sea gamma analysis of dissolved Thorium-234 in seawater
(Woods Hole Oceanographic Institution, 1994-07)
Two polypropylene cartridge types (Beta Pure and Hytrex II) were tested in the laboratory as adsorbers for in-situ collection of dissolved Thorium-234 (234TH) in seawater. Using a uranyl nitrate tracer, we determined that ...
An assessment of particulate organic carbon to thorium-234 ratios in the ocean and their impact on the application of 234Th as a POC flux proxy
Thorium-234 is increasingly used as a tracer of ocean particle flux, primarily as a means to estimate particulate organic carbon export from the surface ocean. This requires determination of both the 234Th activity ...
Th-234 sorption and export models in the water column : a review
Over the past few decades, the radioisotope pair of 238U/234Th has been widely and increasingly used to describe particle dynamics and particle export fluxes in a variety of aquatic systems. The present paper is one of ...
An inverse relationship between production and export efficiency in the Southern Ocean
(John Wiley & Sons, 2013-04-23)
In the past two decades, a number of studies have been carried out in the Southern Ocean to look at export production using drifting sediment traps and thorium-234 based measurements, which allows us to reexamine the ...
Revisiting carbon flux through the ocean's twilight zone
(American Association for the Advancement of Science, 2007-04-27)
Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout
(Copernicus Publications on behalf of the European Geosciences Union, 2013-08-15)
Radionuclide impact of the Fukushima Dai-ichi nuclear power plant accident on the distribution of radionuclides in seawater of the NW Pacific Ocean is compared with global fallout from atmospheric tests of nuclear weapons. ...