Are the pelagic clay-rich sediments a major source of elements to bottom-waters?
Steiner and colleagues analysed porewater and bulk sediment concentrations of multiple trace elements along a transect from Hawaii to Alaska.
Sediments
First direct measurement of actinium (but also radium and thorium) distribution coefficient values in marine sediments
Actinium-227, radium-226 and radium-228 profiles in sediments were measured and modeled at 5 stations in the Northeast Pacific…
Do you want to know more about iron and its isotopes? This review is for you!
Authors present a comprehensive review of iron and iron isotope sources, internal cycling, and sinks in the ocean.
Shelf sediments in the Benguela Upwelling System as a major source of trace metals to the shelf and eastern South Atlantic Ocean
Liu and her colleagues investigated dissolved trace metals distributions within the Benguela Upwelling System sampled from GEOTRACES GA08 cruise.
North African dust is an important (but not dominant) source of iron to the Gulf of Mexico
Hayes and colleagues have combined data to estimate how important North African dust could be as a source of iron to the Gulf of Mexico.
A new and more quantitative atlas of the deep-sea burial fluxes of major and trace elements
Among other findings, authors find that the new opal flux is roughly a factor of two increase over previous estimates having important implications for the global silicon cycle.
Air-sea gas disequilibrium drove deoxygenation of the deep ice-age ocean
This study provides one of the first mechanistic explanations for Last Glacial Maximum deep ocean deoxygenation.
Thorium-Protactinium fate across the tropical Atlantic Ocean: what reveals the water column-sediment coupling
Twenty seawater profiles and twenty core-top 231-protactinium and 230-thorium analyses were realised by Ng and colleagues along five depth transects across the northern tropical Atlantic open ocean.
Arctic mercury export flux with marine particles higher than anticipated
In the ocean, the residence time of mercury (Hg), is largely driven by two removal mechanisms: evasion to the atmosphere and downward export flux with settling particles. The later was […]
Why did the concentration of atmospheric carbon dioxide rise so much and so quickly during the last deglaciation?
During the Last Glacial Maximum, the deep southern Pacific waters were stratified, efficiently accumulating old, CO2 rich waters. Basak and co-authors (2018, see reference below) measured neodymium isotopes in sediment […]
The sedimentary flux of dissolved rare earth elements to the ocean
This work highlights the importance of the sedimentary source of dissolved Rare Earth Elements (REE) to the oceanic waters. Indeed, strong subsurface REE concentration maxima are evidenced in pore fluids […]