GEOTRACES is an international programme which aims to understand biogeochemical cycles and large-scale distributions of trace elements and their isotopes (TEIs) in all major ocean basins.
To date: 96 cruises completed – 1024 stations sampled
The first GEOTRACES Intermediate Data Product (IDP2014) released in 2014 demonstrated the key importance of high-resolution data on TEIs for marine research. Discoveries included:
This 3-dimensional scene shows the distribution of dissolved iron (Fe) in the Atlantic Ocean (warm colours indicate high concentrations). Iron is a nutrient essential for biological production.
Thanks to GEOTRACES, strong hydrothermal iron sources were revealed in many locations along the Mid-Atlantic-Ridge (indicated by white arrows) challenging the long-standing view which considered these sources to be negligible.
Improving our understanding of the oceanic iron cycle and its sensitivity to changing environmental conditions will improve projections of ocean’s response to climate change.
.What will the new Intermediate Data Product bring?
The new GEOTRACES Intermediate Data Product (IDP2017)will include increased hydrographic and marine geochemical data, present a more complete coverage of the global ocean and a larger range of biogeochemical parameters…
More GEOTRACES data = New exciting findings!
For example, results along a GEOTRACES section between Peru and Tahiti illustrate contrasting distributions for two different TEIs, dissolved cobalt (Co) and dissolved iron (Fe):
It is recognised that low oxygen environments are favourable to the occurrence of soluble dissolved Fe. However, the above figures show that while dissolved Co maxima (indicated in warm colours: red, orange, etc.) strictly follow the layers corresponding to the lowest oxygen concentrations, dissolved Fe maxima are surprisingly occurring below these layers. Hydrothermal dissolved Fe input is significant, while nul for dissolved Co.
Depicting these differences of behaviours among essential nutrient elements and others will result in even more exciting discoveries!
Use the GEOTRACES IDP2017 and discover them!
.Where can I find the GEOTRACES IDP2017?
The GEOTRACES Intermediate Data Product is available on-line. It consists of:
(2) an on-line eGEOTRACES Electronic Atlas (eGEOTRACES.org) showing the distribution of these data such as the figures above.
Note: The above hyperlinks are currently pointing to the IDP2014. These sites will be updated to include the IDP2017 data after the release of it.
In addition to the anticipated usage for marine research, eGEOTRACES and the contained visual material can help in teaching and outreach activities and can also facilitate conveying societally relevant scientific results to interested laymen or decision makers.
. When will the GEOTRACES IDP2017 be released?
The GEOTRACES IDP2017 will be publicly released at the 2017 Goldschmidt Conference:
GEOTRACES Intermediate Data Product 2017 Wednesday, 16 August 2017, 12h45 – 14h15 2017 Goldschmidt Conference (Paris, France) Room: 252A/B (Palais des Congrés de Paris) – Room has changed!
An updated eGEOTRACES Electronic Atlas will be distributed on a USB drive A limited number of lunch boxes will be provided