- GEOTRACES intercalibration of the stable silicon isotope composition of dissolved silicic acid in seawater
Dissolved silicon is a major oceanic nutrient and variations of its stable isotope values are reflecting the intensity of surface primary production. As for other isotopes, agreement between the different laboratories is crucial. The first intercalibration study of the stable silicon isotopes in seawater is presented as a contribution to the international GEOTRACES programme...
- Disentangling the paleo signals brought by neodymium isotopic composition
Which paleo information are traced by the imprint neodymium isotopic signatures in the different archives: paleo circulation or paleo erosion? The scientific debate on this issue is opened for years now. Tachikawa and co-workers are proposing an important step forward with a thorough review of the fate of εNd in the modern ocean combined with other tracers as hydrography parameters...
- A new method for simultaneous analysis of nickel, copper and zinc isotopes in seawater
Takano and co-workers have developed a new method to determine nickel, copper and zinc isotopes in seawater. This method is very simple and rapid only using single chelating extraction and single anion exchange...
- 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 availability. The biological activity in the surface waters is also characterized by a marked seasonality. Nishioka and Obata propose a detailed DFe zonal section across the North Pacific (~47°N), realized in the framework of Japan-GEOTRACES programme...
A GEOTRACES session entitled « Trace elements and their isotopes as geochemical proxies of past ocean conditions » was successfully held at the Past Global Changes (PAGES) Open Science Meeting (9-13 May 2017 - Zaragoza, Spain). Eight speakers and 28 posters were presented to more than 150 attendees.
This session was a promising first step towards builiding improved links between the modern and paleo-oceanographers.
-Mason, R. P., Hammerschmidt, C. R., Lamborg, C. H., Bowman, K. L., Swarr, G. J., & Shelley, R. U. (2017). The air-sea exchange of mercury in the low latitude Pacific and Atlantic Oceans. Deep Sea Research Part I: Oceanographic Research Papers, 122, 17–28. doi: 10.1016/j.dsr.2017.01.015
- Rolison, J. M., Stirling, C. H., Middag, R., & Rijkenberg, M. J. A. (2017). Uranium stable isotope fractionation in the Black Sea: Modern calibration of the 238U/235U paleo-redox proxy. Geochimica et Cosmochimica Acta, 203, 69–88. doi: 10.1016/j.gca.2016.12.014
- Samanta, S., Amrutha, K., Dalai, T. K., & Kumar, S. (2017). Heavy metals in the Ganga (Hooghly) River estuary sediment column: evaluation of association, geochemical cycling and anthropogenic enrichment. Environmental Earth Sciences, 76(4), 140. doi: 10.1007/s12665-017-6451-x
-Waeles, M., L. Cotte, B. Pernet‐Coudrier, V. Chavagnac, C. Cathalot, T. Leleu, A. Laës‐Huon, A. Perhirin, R. Riso, and P. Sarradin (2017). On the early fate of hydrothermal iron at deep‐sea vents: a reassessment after in‐situ filtration. Geophysical Research Letters. doi: 10.1002/2017GL073315
- Kadko, D. (2017). Upwelling and primary production during the U.S. GEOTRACES East Pacific Zonal Transect. Global Biogeochemical Cycles, 31(2), 218–232. doi: 10.1002/2016GB005554
-Xie, R. C., Galer, S. J. G., Abouchami, W., Rijkenberg, M. J. A., de Baar, H. J. W., De Jong, J., & Andreae, M. O. (2017). Non-Rayleigh control of upper-ocean Cd isotope fractionation in the western South Atlantic. Earth and Planetary Science Letters (Vol. 471). doi: doi: 10.1016/j.epsl.2017.04.024
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.