GEOTRACES Intermediate Data Product 2021 (version 2)

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The third GEOTRACES intermediate data product (IDP2021) gathers hydrographic and marine biogeochemical data acquired on 89 cruises, expanding considerably the collection of results released in 2017. The current version of the IDP2021 is version 2 which was released on 7 July 2023.  IDP2021 version 2 (IDP2021v2) includes additional data not available for version 1 and other amendments as detailed in the IDP2021v2 changes document.

The IDP2021 version 2 contains trace elements that serve as micronutrients, tracers of continental sources to the ocean (e.g., aerosols and boundary exchange), contaminants (e.g., Pb and Hg), radioactive and stable isotopes used in paleoceanography and a broad suite of hydrographic parameters used to trace water masses, as well as, it provides biological data.

By releasing the intermediate data products, GEOTRACES aims to intensify collaboration within the broader ocean research community but also seeking feedback from the community to help us improve future data products.

>>> Download IDP2021 leaflet <<<
>>> Please help us to improve the IDP by sending us (ipoNO SPAM -- FILTER@NO SPAM -- your feedback <<<
>>> The IDP2021 version 1 was released on 17 November 2021, you can view the recording of the release event here >>>
>>>The IDP2021 version 2 was made available online on 7 July 2023. The changes from version 1 are listed in this document >>>

The Product

The IDP2021 version 2 consists of two parts:

(1) the digital data (hydrographic and biogeochemical data from 89 cruises, covering the global ocean) and
(2) the eGEOTRACES Electronic Atlas

Access GEOTRACES data:

There are 4 ways to access GEOTRACES data to accommodate different users:

1. Bulk (full packages) download – 3 formats: CSV-ASCII, NetCDF and Ocean Data View (ODV) collections: or through the DOI: 10.5285/ff46f034-f47c-05f9-e053-6c86abc0dc7e .

>>Should you need any other data format please contact the GEOTRACES IPO at ipoNO SPAM -- FILTER@NO SPAM --

2. Online sub-setting and extraction (WebODV Extractor online*) – easy to select variables, region, cruises, etc.:

3. Online analysis, exploration and visualization (WebODV Explore online*) – very user friendly, no need to download software or data:

Data Access: The data is available to download in 3 formats: csv ASCII, NetCDF and as Ocean Data View collections. In addition, analysis, exploration and visualisation of these data without download it is possible by using the webODV tool.

>> The video available on the right explains how to work with IDP2021 data using webODV tool.

Click on the image to view the tutorial video “Working with IDP2021 and WebODV”, by Phoebe Lam. Download the slides of this presentation here.

4. The eGEOTRACES Electronic Atlas (available at – based on the digital data package and provides section plots and animated 3D scenes for many of the parameters, allowing quick overviews of the occurrence of geochemically relevant tracers. The 3D scenes provide geographical context crucial for correctly assessing extent and origin of tracer plumes as well as for inferring processes acting on the tracers and shaping their distribution. The numerous links to other tracers, sections and basins found on section plots and 3D animations allow quick switching between parameters and domains and facilitate comparative studies. In addition, eGEOTRACES can help in teaching and outreach activities and can also facilitate conveying societally relevant scientific results to interested laymen or decision makers.

Usage: Users select parameters, cruise tracks and ocean basins using list-boxes and interactive maps. eGEOTRACES then presents parameter distributions along the selected sections, or animated 3D scenes showing parameter distributions along all available sections in the selected basin.

A special effort has been made to link information about data originator, original publications and analytical methods with every data value. Proper linkage to and prominent display of originator information is used throughout the IDP and considered important to provide credit to data producers.

To learn more you can view the videos below introducing the IDP2021, more videos are available here:

GEOTRACES IDP2021: What does it include and how can it be accessed, by Reiner Schlitzer. Download the slides here.
Linking Trace Metal and Isotope (TEI) and Genomics Data by Maite Maldonado. Download the slides here.

Massive increase of data available…

The GEOTRACES IDP2021 version 2 represents a significant expansion in data available compared to the IDP released in 2017. The product contains now data from 89 cruises and 3362 stations (9 cruises and 211 more stations than version 1, highlighted in red in the central map of the figure below) compared to the 23 cruises and 1866 stations in 2017 (highlighted in blue on the map below).

The case of iron

The figure below also presents 3D scenes showing the distribution of dissolved iron (DFe) in the Atlantic, Arctic, Indian and Pacific Oceans. The new product adds new data in the Pacific and Atlantic Ocean basins. More spectacular is the considerable amount of new data displayed in the Indian and Arctic Ocean 3D scenes. All together, these data allow a global ocean view of hydrothermal iron inputs along oceanic ridges as well of the release of DFe from sediments along the coasts (along the African, South American, Asian and Peruvian coasts).

*Note: all 3D scenes figures in this page follow the same colour code: warm colours (red, orange, etc.) indicate high concentrations

© Schlitzer, Reiner, eGEOTRACES – Electronic Atlas of GEOTRACES Sections and Animated 3D Scenes,, 2021.

GEOTRACES IDP Fair Use Agreement and citation

The GEOTRACES IDP2021 version 2 is released under the Creative Commons By Attribution (CC-BY) Licence 4.0 as described in the Fair Use Agreement.

Please cite the IDP2021 version 2 as:

GEOTRACES Intermediate Data Product Group (2023). The GEOTRACES Intermediate Data Product 2021v2 (IDP2021v2). NERC EDS British Oceanographic Data Centre NOC. doi:10.5285/ff46f034-f47c-05f9-e053-6c86abc0dc7e.

IDP related helpful tools

A page listing helpful tools developed by IDP users and that the developers are willing to make them available to other users is available here.

Links for previous GEOTRACES IDP versions and historical TEI data