Water mass circulation and weathering inputs in the Labrador Sea based on coupled hafnium-neodymium isotope compositions and rare earth element distributions

Filippova and co-authors (2017, see reference below) show distinct water mass signatures in the Labrador Sea revealed by combined dissolved hafnium (Hf) and neodymium (Nd) isotope compositions and REE distribution patterns along the AR7W transect in May 2013. The new data show that in a semi-enclosed basin such as the Labrador Sea, the radiogenic Hf […]

Jan / 13 / 2017

Lithogenic influence from the Hawaiian Islands detectable up to Station ALOHA surface waters

By coupling neodymium (Nd) and radium (Ra) isotopes and Rare Earth Element (REE) signals, Henning Fröllje and co-workers (2016, see reference below) show that the coastal Hawaiian waters are affected by a prominent lithogenic influence from the Hawaiian Islands. Rare earth patterns, radiogenic εNd signatures and high 228Ra levels are clearly tracing this influence. Moreover, […]

Sep / 08 / 2016

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 the GEOTRACES process study AMANDES (Chief scientist: Catherine Jeandel). The sharp drop of REE concentrations in the low-salinity area (already observed in several estuaries) is […]

Jul / 06 / 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 regional circulation model (NEMO 1/12). Comparison with the numerous set of data acquired in the framework of different Mediterranean Sea transects conducted on the last […]

Jun / 30 / 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 this exceptional GEOTRACES-compliant data, collected on R/V Polarstern cruise PS75, authors characterize the εNd signature of Ross Sea Bottom Water (εNd ~ -7) and show that […]

Jun / 12 / 2015

New neodymium data in the North East Atlantic Ocean allow progressing on the behaviour of this geochemical tracer

High-resolution vertical profiles of neodymium (Nd) concentrations and isotopic compositions were measured at the eastern part of the US GEOTRACES North Atlantic Zonal Transect (GA03, Gulf of Cadiz – Mauritanian Shelf – Cape Verde Islands). This allowed documenting impacts of different environmental settling on the tracer’s behaviours: the Mediterranean Outflow Waters (MOW), the Saharan dust […]

Feb / 23 / 2015

Present day neodymium isotopic composition of the Caribbean Sea deep waters questions the paleo-application of this tracer in restricted basins

The first profiles of neodymium (Nd) concentration and isotopic composition in the Carribbean Sea have been published. They show that surface and intermediate waters flow through the Caribbean with essentially unchanged Nd isotopes ratios (εNd), whereas deep waters are strongly modified. Indeed, they likely receive radiogenic Nd released from the local sediments, of volcanic origin. […]

Nov / 07 / 2014

New data on oceanic rare earth elements concentrations and neodymium isotopic compositions

Early 2014 was favourable to the publication of new data of rare earth elements (REE) concentrations and neodymium (Nd) isotopic compositions in extreme areas of the ocean: the southern Atlantic Ocean, the north east corner of the Pacific Ocean and the remote south Pacific Ocean. Three works of three different groups (Garcia-Solsona et al.; Haley […]

Feb / 11 / 2014