GEOTRACES Science Highlights
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– Changing the cadmium:phosphorus paradigm
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The well-established strong linear relationship linking dissolved cadmium (Cd) and phosphorus (P) concentrations in seawater is at the origin of the attraction of Cd as a proxy for PO4 in the paleocean. However, exploring the dissolved Cd and PO4 distributions in the ocean, Quay and co-workers show that the Cd/P of particles exported from the surface ocean doubles in high-nutrients low chlorophyll regions…
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– Decoupling between dissolved zinc and silicon in the North Atlantic Ocean driven by mixing of end-members
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Roshan and Wu reveal that the correlation between dissolved zinc (Zn) and silicon (Si) is relatively weak in the North Atlantic Ocean (GA03 section). They use the results of an Optimum Multi-Parameter Water Mass Analysis to establish which parameter is mainly controlling the Zn distribution…
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– Nitrate isotope distributions on the U.S. GEOTRACES North Atlantic cross-basin section
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The distribution of the δ15N and the δ18O in the U.S. GEOTRACES North Atlantic zonal transect (GA03 section) provides an insight on the interaction between aspects of the circulation of the Atlantic basin and features of the N cycle in the absence of a regional signal of water column denitrification…
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– Multiple controls on the dissolved aluminium fate in the western Atlantic Ocean
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Thanks to the most impressive set of dissolved aluminium (Al) and silicon (Si) data ever published in the Atlantic Ocean, Middag and co-workers are thoroughly scanning the processes determining their oceanic distribution…
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– Dissolved Gallium in the Beaufort Sea: a promising conservative water mass tracer
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Mc Allister and Orians present the first dissolved Ga (DGa) data ever reported in the Arctic. DGa behaves very conservatively, helping to constrain the mixing of water masses of Pacific and Atlantic origins. Its conservative behaviour helps distinguishing seasonal processes that are influencing temperature and Nitrate:Phosphate of Pacific Water entering the Arctic…
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GEOTRACES News
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– GEOTRACES Intermediate Data Product 2017:
*** Timelines for data submission and review ***
Following the very successful release of the first GEOTRACES Intermediate Data Product in 2014 (IDP2014), GEOTRACES plans to release IDP2017 at the Goldschmidt meeting in Paris in August 2017.
Please take a minute to review timelines for data submission and review available on the GEOTRACES website….
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– Historic crossover meeting in the North Pole
Submitted by Greg Cutter.
When the Standards and Intercalibration Committee created the idea of the crossover station – where two different GEOTRACES transect cruises occupy the same sampling station and subsequently compare their data to facilitate intercalibration – we never imagined that the ships would be there at the same time, let alone at the North Pole. But on 7 September 2015 that is exactly what happened in the Arctic Ocean when the US cruise aboard US Coast Guard Cutter Healy who had just finished sampling rendezvoused with German ship Polarstern which would begin theirs. We were both rafted up to the same ice floe and simply walked ca. 1000 m to visit each others ships, labs, and share experiences and knowledge. It was about the halfway point for both cruises and seeing our colleagues was simply the best morale booster an oceanographer could have.
Figure: USCGC Healy and RV Polarstern at the North Pole, 7 Sept. 2015. ©Stefan Hendricks.
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GEOTRACES in Numbers
| » Cruises completed: |
55 |
» Section cruises completed:
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26 |
» Stations completed:
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783
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» Peer-reviewed papers:
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554
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GEOTRACES Dates
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– Cruises:
10 July 2015 – 1 October 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.
17 December 2015 – 28 January 2016, UltraPac – Process Study (GPpr09), South Pacific.
– Forthcoming GEOTRACES Meetings:
7 – 8 December 2015, The biological and climatic impacts of ocean trace-element chemistry, The Royal Society, London, UK. Registration is open!
9 – 10 December 2015, Quantifying fluxes and processes of trace-metal cycling at ocean boundaries, Chicheley Hall, Buckinghamshire, UK.
Registration is open!
– Forthcoming GEOTRACES Special Sessions:
14 – 18 December 2015, American Geophysical Union Fall 2015, San Francisco, California, USA.
21 – 26 February 2016, 2016 Ocean Sciences Meeting, San Francisco, California, USA.
– Other relevant events:
26 – 30 October 2015, IMBER IMBIZO IV, Trieste, Italy.
26 – 28 October 2015, The 2nd Open Science Symposium on Western Pacific Ocean Circulation and Climate (2nd OSS-2015), Busan, Korea.
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| Access the GEOTRACES Calendar |
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Latest Publications
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– Ren, J.-L., Xuan, J.-L., Wang, Z.-W., Huang, D., & Zhang, J. (2015). Cross-shelf transport of terrestrial Al enhanced by the transition of northeasterly to southwesterly monsoon wind over the East China Sea. Journal of Geophysical Research: Oceans, 120(7), 5054–5073. doi: 10.1002/2014JC010655.
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– Mackey, K. R. M., Post, A. F., McIlvin, M. R., Cutter, G. A., John, S. G., Saito, M. A. (2015). Divergent responses of Atlantic coastal and oceanic Synechococcus to iron limitation. Proceedings of the National Academy of Sciences of the United States of America, 112(32), 9944–9949. doi:10.1073/pnas.1509448112.
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– Salt, L. A., van Heuven, S. M. A. C., Claus, M. E., Jones, E. M., de Baar, H. J. W.(2015). Rapid acidification of mode and intermediate waters in the southwestern Atlantic Ocean. Biogeosciences, 12(5), 1387–1401. doi: 10.5194/bg-12-1387-2015.
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– Conway, T. M., John, S. G., & (2015). The cycling of iron, zinc and cadmium in the North East Pacific Ocean – Insights from stable isotopes. Geochimica et Cosmochimica Acta, 164, 262–283.
doi: 10.1016/j.gca.2015.05.023.
– Moore, W. S. (2015). Inappropriate attempts to use distributions of 228Ra and 226Ra in coastal waters to model mixing and advection rates. Continental Shelf Research, 105, 95–100.
doi: 10.1016/j.csr.2015.05.014.
– Roshan, S., Wu, J.(2015). Water mass mixing: The dominant control on the zinc distribution in the North Atlantic Ocean. Global Biogeochemical Cycles, 29(7), 1060–1074.
doi: 10.1002/2014GB005026.
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| Acces the GEOTRACES Database |
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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. |
