Venkatesh Chinni and Sunil Kumar Singh propose dissolved iron profiles along two meridional transects realized during spring and fall seasons between the Arabian Sea and the sub-tropical western Indian Ocean…
Jan / 24 / 2022
Land-ocean Inputs
Quantifying the weathered fluxes to the ocean is far from over: the overlooked role of rock coast erosion
This study reveals that cliff derived sediment supply is only three times less than the solid discharge of rivers for Europe.
Jan / 21 / 2022
Oceanic Margins as sources of lithogenic particulate and dissolved iron in the North Pacific Ocean
Three GEOTRACES Japanese cruises on board the R/V Hakuho Maru allowed establishing basin-scale and full-depth sectional distributions of total dissolvable iron (tdFe), dissolved iron (dFe), and labile particulate iron (lpFe=tdFe […]
Mar / 10 / 2020
Unprecedented iron delivery from the Congo River margin to the South Atlantic Gyre
Radium isotopes are used to demonstrate that make the Congo the most significant riverine source of iron to the South Atlantic.
Jan / 30 / 2020
Tracing water mass mixing in the Cape Basin and the restricted Angola Basin with radiogenic neodymium isotopes
In the frame of GEOTRACES cruise GA08, Rahlf et al. (2020, see reference below) determined seawater profiles of dissolved radiogenic neodymium isotope signatures (εNd) and neodymium concentrations across the restricted western […]
Dec / 16 / 2019
Rare Earth distribution and pattern anomalies in the Solomon Sea
The Solomon Sea is surrounded by high and intensively weathered islands. Its complex topography and hydrography make this area a potential source of trace elements to the waters flowing through […]
The Scottish shelf break is not a significant source of iron to North Atlantic surface waters
A high resolution survey of the distribution of dissolved iron (dFe) over the Hebridean (Scottish) shelf break was conducted as part of the U.K. Shelf Sea Biogeochemistry programme, a GEOTRACES […]
Feb / 18 / 2019
Rare Earth Elements are less and less natural tracers in the ocean
This verdict is well illustrated by the recent study of Rodrigo Pedreira (2018, see reference below) off the North East Brazilian coast. His Rare Earth Elements (REE) data reveal marked […]
Sep / 19 / 2018
Revelations from the dissolved 226Ra-228Ra pair distribution in the South East Pacific Ocean
They show that radium-228 data coupled to the dissolved iron, cobalt and manganese provide evidence that lateral transport of sediments from continental margins.
Jun / 05 / 2018
Estuary solid loads and solid-solution exchanges yield considerable dissolved trace metal enrichments
Based on a thorough investigation of water and suspended sediment samples collected over two years and a six seasons, Samanta and Dalai (2018, see reference below) show that the annual […]
Jun / 01 / 2018
Astonishing protactinium and thorium profiles in the Mediterranean Sea
In the framework of the GEOTRACES cruise along the GA04 section in the Meditterranean Sea, Gdaniec et al. (2018, see reference below) measured thorium (Th) and protactinium (Pa) isotope distributions […]
Mar / 29 / 2018
Climate change induced spectacular increase of the land-ocean inputs in the Arctic Ocean
Measurements of radium-228 (228Ra) in the framework of the 2015 U.S. GEOTRACES Arctic Transect (GN01), revealed that the surface water content of this tracer has almost doubled over the last […]
Jan / 09 / 2018
New neodymium concentration and isotopic data from the West Pacific Ocean
In the framework of the GEOTRACES TransGeoBioOc process study (GPpr04), seawater samples were collected at 12 stations (and up to 17 depths per stations) along the SO223T cruise transect from […]
Dec / 06 / 2017
Shelf sediment dissolved iron source via non-reductive dissolution in the Gulf of Alaska
Crusius and co-workers (2017, see reference below), reveal temporal and spatial variability in the sources of iron (Fe) to the northern Gulf of Alaska, based on data from cruises from […]
Jun / 12 / 2017
Important external dissolved iron inputs, HNLC water formation and strong biological seasonality explained in the North Pacific Ocean
Subarctic Pacific is known as High Nutrient, Low Chlorophyll (HNLC) area, where phytoplankton growth is limited by dissolved iron (DFe) availability. The biological activity in the surface waters is also […]
Apr / 13 / 2017
Solute-particle interactions and the enhanced dissolved barium flux from the Ganga River estuary
Dissolved and particulate barium (Ba) were investigated in samples that were collected in six periods of contrasting water discharge over two years (2012 and 2013) by Saumik and Dalai (2016, […]
Nov / 16 / 2016
Large fluxes of dissolved aluminium exported from the coast to the ocean
In the Eastern China Sea (ECS), the continental shelf serves as an important source of dissolved aluminium (DAl) for the overlaying waters via resuspension of sediments and benthic fluxes. This […]
Oct / 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 […]
Jun / 29 / 2015
Dissolved iron sources in the North Atlantic Ocean quantified
The relative importance of four different dissolved iron (Fe) sources in the North Atlantic Ocean have been precisely determined for the first time thanks to GEOTRACES. Using a novel method […]
Jul / 02 / 2014
The impact of the different sources of iron on the ability of the ocean to absorb atmospheric carbon dioxide: reversing the paradigm?
Using model simulations, Tagliabue and co-authors (2014, see reference below) tested the sensitivity of the ocean to absorb the atmospheric carbon dioxide (CO2) in response to variable supply of iron. […]
Jun / 12 / 2014
Long-lived thorium isotopes: powerful tools to estimate lithogenic fluxes to the ocean
Hayes and co-workers are back with another rich contribution, based on dissolved thorium-232 (232Th) and thorium-230 (230Th) (click here to access previous highlight from the same author). The game is […]
Jan / 21 / 2014
When ocean dynamic drives the land to ocean input of iron
Nishioka and co-authors demonstrate the pivotal role of tidal mixing in the Kuril Islands chain (KIC) for determining iron (Fe) supply to the euphotic zone of the Western Subartic Pacific. […]
Nov / 21 / 2013
Large amounts of soluble manganese(III) identified at the land-ocean interface
Soluble manganese(III) [Mn(III)] is a phase traditionally considered non important in aqueous redox reactions. However, applying a spectrophotometric method sensitive to Mn oxidation state, Madison and co-authors found that up […]
Oct / 28 / 2013
Tracking the Indian Ocean source of barium
Intermediate waters of the Bay of Bengal can be a significant source of dissolved barium (Ba) to the Indian Ocean. This is the conlusion of an extensive study of the […]
Sep / 05 / 2013
GEOTRACES scientists discover new variability in iron supply to the oceans with climate implications
Researchers based at the National Oceanography Centre Southampton (UK) and at the University of South Carolina (USA) have found that the amount of dissolved iron released into the ocean from […]
Jul / 22 / 2013
Dissolved cobalt enrichments over the Kerguelen plateau confirm that most of the natural fertilization is due to partial dissolution of local basalts
Exceptionally high dissolved cobalt (Co) concentrations have been measured in the surface waters above the Kerguelen Plateau (KEOPS), and in intermediate and deep waters above its eastern slope. Lateral advection […]
Mar / 03 / 2013
Significant role of dissolved/particulate neodymium from the Ganga–Brahmaputra river system and Bay of Bengale margin in contributing to the dissolved Nd budget of the global oceans.
Data on dissolved Nd concentrations and isotopic compositions measured along a 87 E transect (GI01 section, “Indian GEOTRACES”) have been used in an inverse model in order to identify the […]
Feb / 25 / 2013
Basin-scale inputs of cobalt, iron, and manganese from the Benguela-Angola front to the South Atlantic Ocean
The African coast appeared to be a major source of dissolved total dissolved cobalt, iron, manganese, and labile cobalt to the South Atlantic basin, with high cobalt concentrations in the […]
Dec / 16 / 2012
Ocean margins: the missing term for oceanic element budgets?
Jeandel, Catherine, Peucker-Ehrenbrink, Bernhard, Jones, Morgan T., Pearce, Christopher R., Oelkers, Eric H., Godderis, Yves, Lacan, François, Aumont, 0livier and Arsouze, Thomas This paper underlines how poor is our understanding […]
Jul / 21 / 2011