- Prokaryotic communities display elevated trace metal concentrations in Pacific oxygen deficient zone
Local particulate maxima in many bioactive trace metals are found in the upper Oxygen Deficient Zone (ODZ), coincident with particulate phosporous maxima that indicate biomass enrichments. This observation was made by Ohnemus and colleagues during the US GEOTRACES Eastern Pacific Zonal Transect (GP16) cruise which crossed the Pacific ODZ and oligotrophic gyre...
- Solute-particle interactions and the enhanced dissolved barium flux from the Ganga River estuary
Dissolved and particulate barium were investigated in samples that were collected in six periods of contrasting water discharge over two years (2012 and 2013) by Saumik and Dalai in the Ganga (Hooghly) River estuary. The authors thoroughly documented anthropogenic sources and submarine groundwater discharges...
- Estimation of the trace element deposition fluxes to the Atlantic Ocean using two different methods
Shelley and co-workers established that atmospheric deposition of trace elements was low throughout May-June 2014 along the GEOVIDE (GA01) cruise track in the North Atlantic Ocean. They also demonstrate that the aerosol trace element composition could be represented as simply the mixing of two aerosol sources...
- Oxygen biogeochemistry exerts a strong influence on cobalt cycling
This is an important result of the US GEOTRACES East Pacific Zonal Transect cruise (GP16) discussed by Hawco and his co-workers. The distribution of dissolved cobalt and labile cobalt along this section is closely tied to the oxygen minimum zone....
- Up to four mercury species measured along the GEOTRACES East Pacific Zonal Transect
Total mercury, elemental mercury, monomethyl-mercury, and dimethyl-mercury were measured at an unprecedent resolution so far along the US East Pacific Zonal Transect GEOTRACES cruise (GP16). Knowing that monomethyl-mercury is a neurotoxin that accumulates in the trophic chain, establishing the full speciation of this element is required in order to better understand oceanic mercury cycle...
- Dissolved iron isotopes reveal that distinct processes are controlling this micronutrient distribution in the ocean
Abadie and co-workers propose new dissolved iron concentration and isotopic composition distributions along the Bonus-Goodhope IPY section (GIPY4), in the Atlantic sector of the Southern Ocean. Dissolved iron concentration vertical profiles display a continuous increase with depth, classically interpreted as due to biological uptake at the surface followed by remineralization at depth...
- New GEOTRACES special issue "Biological and climatic impacts of ocean trace element chemistry"
The GEOTRACES special issue in Philosophical Transactions of the Royal Society of London A dedicated to trace element chemistry is now available!
The volume includes four synthesis papers, which summarise our knowledge and identify areas for future work relating to chemical fluxes at the four ocean boundaries - with the atmosphere, the continents, sediments, and mid-ocean-ridges. These papers and some other papers are available open access.
-Behrens, M. K., Muratli, J., Pradoux, C., Wu, Y., Böning, P., Brumsack, H.-J., Goldstein, S. L., Haley, B., Jeandel, C., Paffrath, R., Pena, L. D., Schnetger, B., Pahnke, K. (2016). Rapid and precise analysis of rare earth elements in small volumes of seawater - Method and intercomparison. Marine Chemistry, 186, 110–120. doi: 10.1016/j.marchem.2016.08.006S.
- Eigl, R., Steier, P., Winkler, S. R., Sakata, K., & Sakaguchi, A. (2016). First study on 236U in the Northeast Pacific Ocean using a new target preparation procedure for AMS measurements. Journal of Environmental Radioactivity, 162, 244–250. doi: 10.1016/j.jenvrad.2016.05.025.
- Fitzsimmons, J. N., Conway, T. M., Lee, J.-M., Kayser, R., Thyng, K. M., John, S. G., & Boyle, E. A. (2016). Dissolved iron and iron isotopes in the southeastern Pacific Ocean. Global Biogeochemical Cycles, 30(10), 1372–1395. doi: 10.1002/2015GB005357.
-Rutgers van der Loeff, M., Venchiarutti, C., Stimac, I., van Ooijen, J., Huhn, O., Rohardt, G., & Strass, V. (2016). Meridional circulation across the Antarctic Circumpolar Current serves as a double 231Pa and 230Th trap. Earth and Planetary Science Letters (Vol. 455). doi: 10.1016/j.epsl.2016.07.027
- Swarr, G. J., Kading, T., Lamborg, C. H., Hammerschmidt, C. R., & Bowman, K. L. (2016). Dissolved low-molecular weight thiol concentrations from the U.S. GEOTRACES North Atlantic Ocean zonal transect. Deep Sea Research Part I: Oceanographic Research Papers, 116, 77–87. doi: 10.1016/j.dsr.2016.06.003.
Banner 3D scene figure: 3D scene showing the distribution of dissolved iron in the Atlantic Ocean. Source: Schlitzer, R., eGEOTRACES - Electronic Atlas of GEOTRACES Sections and Animated 3D Scenes, http://www.egeotraces.org, 2014.