Now showing items 1-10 of 54
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 ...
Introduction to “Understanding the Ocean's biological pump : results from VERTIGO”
Unknown and unexplained aspects of the human condition were the focus of a television series in the USA created by Rod Serling in the early 1960s. The term “The Twilight Zone” used in his show is even more pertinent to ...
Sr-90 and Sr-89 in seawater off Japan as a consequence of the Fukushima Dai-ichi nuclear accident
(Copernicus Publications on behalf of the European Geosciences Union, 2013-06-03)
The impact of the earthquake and tsunami on the east coast of Japan on 11 March 2011 caused a loss of power at the Fukushima Dai-ichi nuclear power plant (NPP) that resulted in one of the most important releases of artificial ...
Synthesis of iron fertilization experiments : from the Iron Age in the Age of Enlightenment
(American Geophysical Union, 2005-09-28)
Comparison of eight iron experiments shows that maximum Chl a, the maximum DIC removal, and the overall DIC/Fe efficiency all scale inversely with depth of the wind mixed layer (WML) defining the light environment. Moreover, ...
Plutonium in groundwater at the 100K-Area of the U.S. DOE Hanford Site
We examined the concentration, size distribution, redox state and isotopic composition of plutonium (Pu) in groundwater at the 100K-Area at the US Department of Energys (DOE) Hanford Site. Total concentrations of Pu ...
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 ...
Changes in fecal pellet characteristics with depth as indicators of zooplankton repackaging of particles in the mesopelagic zone of the subtropical and subarctic North Pacific Ocean
We investigated how fecal pellet characteristics change with depth in order to quantify the extent of particle repackaging by mesopelagic zooplankton in two contrasting open-ocean systems. Material from neutrally buoyant ...
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 ...
Revisiting carbon flux through the ocean's twilight zone
(American Association for the Advancement of Science, 2007-04-27)
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 ...