Science Highlights

Some recent GEOTRACES science findings are reported below.

Shallow methylmercury production in the marginal sea ice zone of the central Arctic Ocean

Understanding persistent high levels of mercury in arctic biota has been an elusive goal for nearly two decades. Little is known about where exactly inorganic Hg inputs into the Arctic […]

20.05.2015

Two GEOTRACES works question the present ocean chemical elements budgets

New revelations on the land-ocean flux of chemical elements are presented in two different papers highlighting the value of the ocean isotopic data. Both works reveal that the present quantification […]

15.05.2015

Thorium and protactinium radionuclides reveal marine particles processes

Thanks to the compilation of thorium-230 (230Th) and protactinium-231 (231Pa) data obtained along north-south and east-west transoceanic sections (in the Atlantic and Pacific Oceans), Hayes and co-workers (2015, see reference […]

13.05.2015

Submarine Groundwater Discharge as a major source of nutrients in the Mediterranean Sea

The authors are proposing a radium-228 (228Ra) isotope mass balance for the upper Mediterranean Sea to estimate the magnitude of Submarine Groundwater Discharge (SGD) to this basin. Radium isotopes have […]

05.05.2015

A new method to measure lead isotopes in the ocean with an outstanding precision

A new method for the determination of seawater lead (Pb) isotope compositions and concentrations was developed, which combines and optimizes previously published protocols for the separation and isotopic analysis of […]

06.03.2015

How to constrain the biogeochemical cycle of cobalt in the surface Western Atlantic Ocean?

Cobalt (Co) is an important micronutrient for many species living in the surface waters (bacteria, cyanobacteria, different types of phytoplancton…). Interestingly, the Co requirements vary between the different species and […]

24.02.2015

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 […]

23.02.2015

What drives the silicon budget in the Bay of Bengal? The isotope composition clues…

The first data set of dissolved silicon isotope composition (δ30Si) along with concentrations (DSi) in seawater of the northern Indian Ocean is presented from the Bay of Bengal (BoB) region. […]

12.02.2015

How iron isotopes offer a new window on the oceanic biogeochemical cycling of iron

Two process studies (2008 and 2012) designed to study temporal changes in the biogeochemical cycling of iron (Fe), provide in situ results for dissolved and particulate Fe (DFe and PFe) […]

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