GEOTRACES Science Highlights
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– Radium quartet reveals no less than four main processes along the GEOTRACES North Atlantic Ocean section (30°N)
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The four radium isotopes (radium quartet) are produced in situ via decay of their insoluble thorium isotope parents in sediments from the continental margins and deep-sea and then released to the ocean. In the ocean, their distributions are controlled by particle removal and radioactive decay with four different half-lives. These properties make the “quartet” an invaluable tracer of coast-to-ocean processes and a water mass spreading chronometer…
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– When direct mapping of diatoms reveals unexpected fate of trace metals in the twilight zone
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Twining and co-authors used synchrotron x-ray fluorescence mapping to measure macronutrients such phosphorus, sulphur, and silicon, and also trace metals like iron, nickel and zinc, in individual cells of a diatom specie during a spring bloom off New Zealand…
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– Iron isotopes in the Equatorial Pacific Ocean: when the dissolved phases are heavier than the particulate ones
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A detailed study of the dissolved and particulate iron concentrations and isotopes off the Papua New Guinea coast is proposed. Regarding the sources, iron isotopic composition (δ56Fe) values reveal that the aerosols are heavier than the average crustal value while the sediments and river/volcano waters display δ56Fe similar to crustal values…
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– Unprecedented set of dissolved manganese data in the North Atlantic Ocean (US GEOTRACES cruise)
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Manganese is an essential nutrient for biological growth. In the ocean, manganese distribution is sensitive to several processes: redox conditions, photochemistry, biological activity, abiotic scavenging, and also eolian, hydrothermal and sedimentary sources. All of them are conditioning the concentration of dissolved manganese in the ocean vertical profiles.…
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– What is controlling the copper isotopic composition in oceanic waters?
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Takano and co-workers strongly suggest that the isotopic composition of dissolved copper (δ65Cu) in surface seawater is mainly controlled by supply from rivers, the atmosphere and deep seawater. This is the conclusion of a study involving six vertical profiles of copper concentration and isotopes measured in the Indian and North Pacific. The finding contradicts preceding interpretations suggesting a strong role of the biological activity in δ65Cu fractionation…
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GEOTRACES News
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– THANKS to Ed Mawji and WELCOME to Abigail Bull!
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Ed Mawji, GEOTRACES data manager, will move to a new position in early February. Ed has done tremendous work in building the GEOTRACES Data Assembly Centre and his contribution was crucial for the successful release of the 2014 GEOTRACES Intermediate Data Product.
On behalf of the GEOTRACES Programme we want to warmly thank Ed for all his work. We wish him very good luck in his new position!
At the same time, we are pleased to welcome Abigail Bull as the new GEOTRACES data manager starting on February 9, 2015. Should you wish to contact Abigail please use geotraces.dac@bodc.ac.uk.
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GEOTRACES in Numbers
| » Cruises completed: |
51 |
» Section cruises completed:
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23 |
» Stations completed:
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732
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» Peer-reviewed papers:
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498
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GEOTRACES Dates
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– Cruises:
1 – 30 April 2015 and 10 July – 2 August 2015, Shelf Seas – Process Study, Celtic Sea.
2 December 2014 – 26 Febrary 2015, Section cruise GP19, Western South Pacific and Antarctic Sea.
07 August 2015 – 10 October 2015, US Arctic section cruise, Arctic.
16 August 2015 – 15 October 2015, German Arctic section cruise, Arctic.
– Forthcoming GEOTRACES Meetings:
13 – 14 July 2015, GEOTRACES Data Management Committee Meeting,
Vancouver, Canada.
15 – 17 July 2015, GEOTRACES Scientific Steering Committee, Vancouver, Canada.
– Forthcoming GEOTRACES Special Sessions:
22 – 27 February 2015, ASLO 2015, Aquatic Sciences Meeting, Granada, Spain.
23 – 27 March 2015, 3rd International Symposium on “Effects of Climate Change on the World’s Oceans”, Santos, Brazil.
– Other relevant events:
4 – 6 March 2015, Ocean Sustainability Science Symposium, Kiel, Germany.
7 – 11 April 2015, SCOR WG 139 Open Workshop and Symposium on Organic Ligands in the Ocean, Sibenik, Croatia.
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| Access the GEOTRACES Calendar |
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Latest Publications
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– Singh, S. P., Singh, S. K., Bhushan, R., & Rai, V. K. (2015). Dissolved silicon and its isotopes in the water column of the Bay of Bengal : Internal cycling versus lateral transport. Geochemica et Cosmochimica Acta, 151, 172-191. doi: 10.1016/j.gca.2014.12.019.
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– Stichel, T., Hartman, A. E., Duggan, B., Goldstein, S. L., Scher, H., & Pahnke, K. (2015). Separating biogeochemical cycling of neodymium from water mass mixing in the Eastern North Atlantic. Earth and Planetary Science Letters, 412, 245–260. doi:10.1016/j.epsl.2014.12.008.
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– Ohnemus, D. C., Auro, M. E., Sherrell, R. M., Lagerström, M., Morton, P. L., Twining, B. S., Rauschenberg, S., Lam, P. J., (2014). Laboratory intercomparison of marine particulate digestions including Piranha: a novel chemical method for dissolution of polyethersulfone filters. Limnology and Oceanography: Methods, 12(8), 530–547. doi:10.4319/lom.2014.12.530.
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– Sudheer, A. K., Rengarajan, R., Deka, D., Bhushan, R., Singh, S. K., & Aslam, M. Y. (2014). Diurnal and Seasonal Characteristics of Aerosol Ionic Constituents over an Urban Location in Western India: Secondary Aerosol Formation and Meteorological Influence. Aerosol and Air Quality Research, 14, 1701–1713. doi: 10.4209/aaqr.2013.09.0288.
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– Conway, T. M., & John, S. G. (2014). The biogeochemical cycling of zinc and zinc isotopes in the North Atlantic Ocean. Global Biogeochemical Cycles, 28(10), 1111–1128. doi:10.1002/2014GB004862.
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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. |
