e-Newsletter March 2019

4 March 2019

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March 2019 – GEOTRACES eNEWSLETTER n°33

GEOTRACES Science Highlights

– The circulation loop in the North Atlantic and Arctic oceans depicted by the artificial radionuclides

	Artificial radionuclides can be used as transient tracers that provide crucial information on pathways, timescales and processes of key water masses that cannot be obtained from hydrographic properties alone. In particular, radionuclides released from the two European Nuclear Reprocessing Plants, have proven to be specifically useful…
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– All the bioactive elements are not affected by the land-ocean gradient of the atmospheric deposition along the Eastern Pacific Zonal Transect

	Atmospheric dust is considered an important source of trace elements to the ocean. As part of the Eastern Pacific Zonal Transect GEOTRACES cruise, Buck and co-workers collected 17 (3-day integrated) aerosol samples along this transect known for its low dust input…
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– 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 over the Hebridean (Scottish) shelf break was conducted as part of the U.K. Shelf Sea Biogeochemistry programme, a GEOTRACES process study…

– Using the three thorium isotope toolbox to probe the particle dynamic within an East Pacific Rise hydrothermal plume

	The insoluble radiogenic isotopes of thorium (Th) are produced at a known rate in the water column via the decay of soluble uranium (²³⁴Th, ²³⁰Th) and radium (²²⁸Th) isotopes. The three isotopes are radioactive and their half-lives vary from days to tens of thousands of years…
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– Isotopic chromium variations do not always reflect the occurrence of low oxygenated waters

	Dissolved chromium (Cr) in the ocean is present under two oxidation states: The oxidized and soluble Cr (VI) and the reduced more reactive Cr (III). Reduction of Cr (VI) to Cr (III) is favored by the occurrence of biological particles, reducing conditions in the sediments or the water column…
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GEOTRACES News

– BioGEOTRACES-Japan Workshop

A workshop entitled ”BioGEOTRACES-Japan begins” was held on 19-21 September 2018 in Nagasaki, Japan to evaluate the potentials of biological studies related to trace elements and their isotopes in the ocean, and to find the future directions of these studies in Japan. For three days, 15 registered Japanese scientists took part in the workshop…

2018 Japan Biogeotraces
Figure: BioGEOTRACES-Japan workshop participants. Click here to view the figure larger.

– BioGeoSCAPES Workshop

In an effort to explore and develop international community interest for a potential future “Biogeotraces-like” program to study the microbial biological and chemical oceanography of the oceans, a working group of 28 scientists from 9 nations met in Woods Hole in November 2018. There was strong interest in continuing this effort among the international participants, who agreed to act as ambassadors to communicate these discussions to their respective national communities. Please join us in building community support for this effort. The workshop report is here.

For further information please see: https://www.biogeoscapes.org/

BioGeoSCAPES logo

– Featured Best Practice –

Inform the IPO at the planning stage of any GEOTRACES special session at a scientific conference

>> To ensure that they are advertised through the GEOTRACES web site and mailing list

GEOTRACES in Numbers

» Cruises completed:	111
» Section cruises completed:	40
» Peer-reviewed papers:	1230

GEOTRACES Dates

– Cruises:

10 March – 14 March 2019, EN631 Process Study (GApr13), North Atlantic Ocean (Sargasso Sea).

12 March – 5 April 2019, IN2019_V02 Process Study (GIpr08), Southern Ocean (East Indian Sector).

25 April – 10 June 2019, KK1902 GEOTRACES Section Cruise (GP09), North West Pacific.

31 October – 6 December 2019, GEOTRACES TONGA Process Study (GPpr14), Western Tropical South Pacific.

– Forthcoming GEOTRACES Summer School

23 – 28 September 2019, 2nd GEOTRACES Summer School, Cadiz, Spain. More information coming soon!

– Forthcoming GEOTRACES meetings:

11 – 12 June 2019, GEOTRACES Standards & Intercalibration Committee, Norfolk, USA.

7 – 8 September 2019, GEOTRACES Data Management Committee, Hobart, Tasmania, Australia.

9 – 11 September 2019, GEOTRACES Scientific Steering Committee, Hobart, Tasmania, Australia.

– Forthcoming GEOTRACES Special Sessions:

18 – 23 August 2019, Goldschmidt 2019, Barcelona.

Access the GEOTRACES Calendar

Latest Publications

– Birchill, A. J., Hartner, N. T., Kunde, K., Siemering, B., Daniels, C., González-Santana, D., Milne, A., Ussher, S. J., Worsfold,P. J., Leopold, K., Painter S. C., Lohan, M. C. (2019). The eastern extent of seasonal iron limitation in the high latitude North Atlantic Ocean. Scientific Reports, 9(1), 1435. DOI: 10.1038/s41598-018-37436-3

– Grand, M. M., Laes-Huon, A., Fietz, S., Resing, J. A., Obata, H., Luther, G. W.,Tagliabue, A., Achterberg, E.P., Middag, R.,Tovar-Sánchez, A., Bowie, A. R. (2019). Developing Autonomous Observing Systems for Micronutrient Trace Metals. Frontiers in Marine Science, 6, 35. DOI: 10.3389/fmars.2019.00035

– Grenier, M., Garcia-Solsona, E., Lemaitre, N., Trull, T. W., Bouvier, V., Nonnotte, P., van Beek, P., Souhaut, M., Lacan, F., Jeandel, C. (2018). Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions. Frontiers in Marine Science, 5. DOI: 10.3389/fmars.2018.00426

– Middag, R., de Baar, H. J. W., & Bruland, K. W. (2019). The Relationships Between Dissolved Zinc and Major Nutrients Phosphate and Silicate Along the GEOTRACES GA02 Transect in the West Atlantic Ocean. Global Biogeochemical Cycles, 33(1), 63–84. DOI: 10.1029/2018GB006034

Acces the GEOTRACES Database

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, 2017.

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