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GEOTRACES Sections. For more information please click here. In red: Planned Sections. In yellow: Completed Sections. In black: Sections completed as GEOTRACES contribution to the IPY. Download the map.
Call for 2014 SCOR Visiting Scholars
- Published on Wednesday, 30 November 2011 08:36
This program sends ocean scientists interested in short-term visits to developing countries. The program is a partnership, with the host institution providing local accommodation and SCOR finding resources to pay for airfares and other local expenses, as necessary. The participating scientists donate their time. They may be onsite for as little as two weeks to as long as visa requirements allow. Applicants may already have selected a host institution or SCOR will help identify hosts.
Applications for the 2014 SCOR Visiting Scholars Program should be sent to Ed.Urban@scor-int.org by 15 January 2014.
Please note that two SCOR partner organizations also offer similar programs with somewhat different focus areas or modes of operation:
- POGO (currently open for applications): http://ocean-partners.org/index.php/training-and-education/pogo-visiting-professorship
- SCAR (2014 placements have already been announced): http://www.scar.org/about/visitingprofessor/
Analyzing rapidly, precisely and semi-automatically lead isotopes on variable volumes of seawater (up to 1000 ml)
- Published on Tuesday, 03 December 2013 11:36
Zurbrick and co-authors present a relatively fast (2.5–6.5 hours), semi-automated system to extract lead (Pb) from seawater, with few chemicals yielding low blanks. They also demonstrate that subsequent Pb isotopic analyses are more precise using a multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) than high resolution ICP-MS (HR ICP-MS).
With the preceding work of Conway and co-workers (Conway et al., 2013) demonstrating similar analytical performances for iron (Fe), zinc (Zn) and cadmium (Cd), the ability of GEOTRACES community to determine key isotopes in seawater is clearly improving.
Figure: A diagram representing the offline Pb extraction apparatus; sample Pb is loaded on a column, which is subsequently flushed with column wash to reduce salts followed by elution of Pb for analysis. Click here to view the figure larger.
Measuring rapidly, precisely and accurately trace metal concentrations on a very small volume of seawater
- Published on Wednesday, 27 November 2013 08:44
An automated, on-line extraction, flow-injection inductively coupled plasma mass spectrometry (ICP-MS) method is presented by Lagerström and co-authors for simultaneous determination of manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu) and zinc (Zn) in open ocean seawater samples. This fully automated commercially available system buffers the pH of the samples on-line and extracts the trace metals from 9 mL of seawater onto a chelation resin column, which is then eluted directly into a magnetic sector ICP-MS. Precision of 1–3% (RSD) and very good agreement with reference consensus values are obtained for most of the elements in less than 9 min per analysis.
Figure: This figure shows the on-line flow injection system. Click here to view the figure in high resolution.
When ocean dynamic drives the land to ocean input of iron
- Published on Thursday, 21 November 2013 11:03
Nishioka and co-authors demonstrates the pivotal role of tidal mixing in the Kuril Islands chain (KIC) for determining iron (Fe) supply to the euphotic zone of the Western Subartic Pacific. Indeed, Fe derived from sediments in the Sea of Okhotsk is discharged through the KIC into the intermediate water masses (~ 800 m) of the western North Pacific. The redistribution of this Fe-rich intermediate water by intensive mixing as it crosses the KIC is the predominant process determining the ratio of micronutrient (Fe) to macronutrients (e.g., nitrate) in subsurface waters. This process explains the significant phytoplankton growth and great seasonal variability observed in the Western compared to the Eastern Subarctic Pacific.
Figure: This image shows the role of tidal mixing in the oceanic dissolved Fe cycle in the subarctic North Pacific, with section profiles of dissolved Fe from this Nishioka's work and from previous Nishioka's works (Line P and 165°E line [Nishioka et al., 2001, 2007]).
A basin-scale vertical section profiles for disolved Fe is also shown on the bottom right corner of the figure.
Please click here to see the figure larger.
- Results from the first US-GEOTRACES cruise in the North Atlantic
- Slow-spreading ridges could be major oceanic iron contributor
- Large amounts of soluble manganese(III) identified at the land-ocean interface
- Dissolved iron in the tropical North Atlantic Ocean
- Departure of US GEOTRACES cruise GP16 in the Pacific