GEOTRACES Science Highlights
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– Unexpected magnitude of the hydrothermal iron inputs in the deep Pacific
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Data from the US GEOTRACES Eastern Pacific Zonal Transect demonstrate that lateral transport of hydrothermal iron, manganese and aluminium is extending up to 4000 km west of the southern East Pacific Ridge, therefore crossing a significant part of the deep Pacific Ocean…
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– Coupling Rare Earth Elements concentrations, neodymium and radium isotopes: a powerful tool to decode environmental processes
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For the first time, neodymium isotopic compositions have been measured together with dissolved and colloidal Rare Earth Elements concentrations in the Amazon estuary salinity gradient, as part of the GEOTRACES process study AMANDES…
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– First major ocean sections of silicon isotopes
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The GEOTRACES programme is providing the first major ocean sections of silicon isotopes, δ30Si, aiding efforts to use this proxy to reconstruct diatom silica production in both the modern and paleo ocean. In the May, 2015 issue of Global Biogeochemical Cycles, Holzer and Brzezinski explore the links between δ30Si within silicic acid and the meriodional overturning circulation…
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– The potential of coupling high-resolution circulation models and geochemical tracers: example of the Mediterranean Sea
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A numerical study proposes the simulation of the anthropogenic tritium invasion as well as the distribution of its decay product helium-3 using a high-resolution regional circulation model (NEMO 1/12). Comparison with the numerous set of data acquired in the framework of different Mediterranean Sea transects conducted on the last 50 years underline the good performances of the model…
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– Neodymium isotopic signature of the Ross Sea Water characterized
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The first seawater neodymium isotopic compositions and neodymium concentrations profiles across the South Pacific circum-Antarctic fronts have been published recently. Thanks to this exceptional GEOTRACES-compliant data, collected on R/V Polarstern cruise PS75, authors characterize the εNd signature of Ross Sea Bottom Water (εNd ~ -7)…
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GEOTRACES News
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– GEOTRACES Scientific Steering Committee and Data Management Committee Meetings held in Vancouver
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The GEOTRACES Scientific Steering Committee and Data Management Committee meetings were held from 13-17 July at the University of British Columbia (Vancouver, Canada) hosted by Prof. Maite Maldonado. Among the topics for dicussion there was the review of the first GEOTRACES Intermediate Data Product (IDP2014) and plans for future data release, the review of the field programme to ensure global coverage of all ocean basins and the start of the GEOTRACES Synthesis of Results initiative (see new item below).
One important decision taken was the release of the next Intermediate Data Product Product during the 2017 Goldschmidt Conference to be held in Paris (August 13-17, 2017, http://goldschmidt.info/2017/).
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– GEOTRACES Synthesis of Results Initiative
GEOTRACES plans to launch a three-pronged synthesis initative. The first component focuses on sources and sinks of TEIs at ocean boundaries, starting with the workshop “The biological and climatic impacts of ocean trace-element chemistry” (7-8 December 2015, Royal Society in London, UK).
The second component focuses on internal cycling of TEIs within the ocean. This will be organised by U.S. GEOTRACES, in collaboration with theOcean Carbon and Biogeochemistry Programme (OCB) in mid-2016.
The third component will be centered on geochemical tracers used as paleoceanographic proxies with a workshop planned for 2017…
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– Special issue on “Organic Ligands- A key Control on trace metal biogeochemistry in the ocean” – Published!
This special issue arises from the work of SCOR working group 139 to improve our understanding of the role of organic metal-binding ligands in oceanic biogeochemistry, a main target of the GEOTRACES international programme. This has been achieved through interdisciplinary collaboration comprising trace metal biogeochemists, organic geochemists and biogeochemical modelers…
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GEOTRACES in Numbers
| » Cruises completed: |
52 |
» Section cruises completed:
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24
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» Stations completed:
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747
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» Peer-reviewed papers:
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545
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GEOTRACES Dates
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– Cruises:
10 July – 2 August 2015, Shelf Seas – Process Study, Celtic Sea.
10 July 2015 – 20 August 2015, Canadian Arctic section cruise (GN02), Arctic.
7 August 2015 – 10 October 2015, US Arctic section cruise (GN01), Arctic.
16 August 2015 – 15 October 2015, German Arctic section cruise (GN04), Arctic.
21 November 2015 – 27 December 2015, section cruise (GA08), South-East Atlantic.
– Forthcoming GEOTRACES Meetings:
7 – 8 December 2015, The biological and climatic impacts of ocean trace-element chemistry, The Royal Society, London, UK.
9 – 10 December 2015, Quantifying fluxes and processes of trace-metal cycling at ocean boundaries, Chicheley Hall, Buckinghamshire, UK.
– Forthcoming GEOTRACES Special Sessions:
16 – 21 August 2015, Goldschmidt 2015, Prague, Czech Republic.
– Other relevant events:
7 – 11 September 2015, SOLAS Open Science Conference 2015, Kiel,Germany.
26 – 31 July 2015, 2015 Gordon Research Conference (GRC) on Chemical Oceanography, Holderness School, Holderness, NH, USA.
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| Access the GEOTRACES Calendar |
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Latest Publications
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– Resing, J. a., Sedwick, P. N., German, C. R., Jenkins, W. J., Moffett, J. W., Sohst, B. M., & Tagliabue, A.(2015). Basin-scale transport of hydrothermal dissolved metals across the South Pacific Ocean. Nature, 523(7559), 200–203. doi: 10.1038/nature14577.
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– Rousseau, T. C. C., Sonke, J. E., Chmeleff, J., Beek, P. van, Souhaut, M., Boaventura, G., Seyler, P., Jeandel, C (2015). Rapid neodymium release to marine waters from lithogenic sediments in the Amazon estuary. Nature Communications, 6, 7592. doi:10.1038/ncomms8592.
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– Abbott, A. N., Haley, B. A., McManus, J., & Reimers, C. E.. (2015). The sedimentary flux of dissolved rare earth elements to the ocean. Geochimica et Cosmochimica Acta, 154, 186–200. doi: 10.1016/j.gca.2015.01.010.
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– Zheng, X.-Y., Yang, J., & Henderson, G. M. (2014). A Robust Procedure for High-Precision Determination of Rare Earth Element Concentrations in Seawater. Geostandards and Geoanalytical Research, 39(3). doi: 10.1111/j.1751-908X.2014.00307.x.
– Lohan, M. C., Buck, K. N., & Sander, S. G. (2015). Organic ligands — A key control on trace metal biogeochemistry in the oceans. Marine Chemistry, 173, 1–2. doi:10.1016/j.marchem.2015.03.017.
– Ayache, M., Dutay, J.-C., Jean-Baptiste, P., Beranger, K., Arsouze, T., Beuvier, J., Palmieri, J., Le-vu, B., Roether, W. (2015). Modelling of the anthropogenic tritium transient and its decay product helium-3 in the Mediterranean Sea using a high-resolution regional model. Ocean Science, 11(3), 323–342. doi:10.5194/os-11-323-2015.
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| Acces the GEOTRACES Database |
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FLASH INFO:
GEOTRACES findings on the cover of Nature!
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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. |
