Science Highlights

Some recent GEOTRACES science findings are reported below.

Nitrate isotope distributions on the US GEOTRACES North Atlantic cross-basin section

The distribution of the δ15N and the δ18O in the U.S. GEOTRACES North Atlantic zonal transect (GA03 section) provides an insight on the interaction between aspects of the circulation of […]

18.09.2015

Dissolved gallium in the Beaufort Sea: a promising conservative water mass tracer

Mc Allister and Orians (2015, see reference below) present the first dissolved Ga (DGa) data ever reported in the Arctic. DGa behaves very conservatively, helping to constrain the mixing of […]

24.08.2015

Unexpected magnitude of the hydrothermal iron inputs in the deep Pacific

Data from the US GEOTRACES Eastern Pacific Zonal Transect (EPZT, GP16) demonstrate that lateral transport of hydrothermal iron, manganese and aluminium extends up to 4000 km west of the southern […]

09.07.2015

Coupling Rare Earth Elements concentrations, neodymium and radium isotopes: a powerful tool to decode environmental processes

For the first time, neodymium (Nd) isotopic compositions have been measured together with dissolved and colloidal Rare Earth Elements (REE) concentrations in the Amazon estuary salinity gradient, as part of […]

06.07.2015

The potential of coupling high-resolution circulation models and geochemical tracers: example of the Mediterranean Sea

For the first time, a numerical study proposes the simulation of the anthropogenic tritium (3H) invasion as well as the distribution of its decay product helium-3 (3He) using a high-resolution […]

30.06.2015

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 […]

29.06.2015

Neodymium isotopic signature of the Ross Sea Water characterized

The first seawater neodymium isotopic compositions (εNd) and neodymium concentrations [Nd] profiles across the South Pacific circum-Antarctic fronts have been published recently (Basak et al., 2015, see reference below). Thanks to […]

12.06.2015

First major ocean sections of silicon isotopes

The GEOTRACES programme is providing the first major ocean sections of silicon isotopes, δ30Si, aiding efforts to use this proxy to reconstruct diatom silica production in both the modern and […]

08.06.2015

Insights into Particle Cycling from Thorium and Particle Data

Phoebe Lam and Olivier Marchal (2015, see reference below) propose to describe, with the same model, the dynamics of particles in the oceanic water column and its effects –on four […]

21.05.2015

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