Australian process study in the Sourthern Ocean successfully completed

A team of biogeochemists are returning to Australia after a three week voyage to the subantarctic Southern Ocean in the vicinity of the SOTS (Southern Ocean Time Series) site (see figure below).  The science party from Australia (IMAS, Australian National University, Edith Cowan University), the USA (Scripps Institution of Oceanography, Bigelow Laboratory of Oceean SciencesThe University of Tennessee) and Switzerland (University of Bern) sampled for aerosols, dissolved and particulate trace metal's and isotopes and conducted iron rate processes measurements.  A major focus on the voyage was to detail the internal cycling of trace elements in the subsurface ocean via a suite of transdisciplinary perturbation experiments (omics, SXRF, isotopes, ligands, uptake) linked to other components of the voyage that targeted the biological carbon pump.  The voyage builds on prior process studies in this region in 2016, and will link with another planned for early 2019 near SOTS.

SOTS site
Figure: Map showing the location of the Southern Ocean Time Series (SOTS) site.

US GEOTRACES GP15 cruise Planning Meeting held in Norfolk

The next US GEOTRACES transect will be GP15 in 2018 and led by Old Dominion University’s Greg Cutter, former co-chair of the S&I Committee. His co-leaders on the expedition are Phoebe Lam, current SSC Co-Chair, and Karen Casciotti, current S&I Committee member. It will start on 18 September 2018 in Seattle, Washington, transit to the Alaskan shelf near Kodiak Island and then head south along 152° W to 20° S, with a fuel and food stop in Hilo, Hawaii. There will be a crossover station at 47° N with Japan’s 2017 GP02 cruise for intercalibration. The cruise will end in Papeete, Tahiti on 24 November 2018. There will be 34 scientists on board the US Research Vessel Revelle, examining over 55 TEIs. To coordinate and plan such an endeavor, we held a two day conference 8 and 9 March at ODU, with 56 attendees from as far west as Hawaii and as far north as Alaska – long distances from Virginia, but not as long as the cruise itself – 67 days and 11,000 km! Unique for many US cruises, we will have a professional journalist on board, reporting on the cruise with educational blogs and perhaps videos (depending on bandwidth), and popular magazine articles afterwards. There will also be a public open house in Hilo, Hawaii for local school children and anyone who would like to tour the ship and learn about GEOTRACES.

 GP15CruiseTrack GP15meeting 

Figures: (1) GP15 Cruise Track with blue dots indicating Full water column stations, white being Demi stations in the upper 1000 m, and red dots being Super stations where additional sampling beyond the Supers will occur. Brown dots are shelf/slope stations and green dots are port stops. (2) Greg Cutter discussing the cruise track with attendees at the 2018 US GEOTRACES GP15 Planning Meeting.

Congratulations to Catherine Jeandel!

Congratulations to Catherine Jeandel, GEOTRACES IPO senior scientist, who has been elected Geochemical Fellow by the Geochemical Society and European Association of Geochemistry!

Her nomination reads:

Catherine Jeandel, LEGOS, Toulouse (France), for her novel “boundary exchange” hypothesis, in which she identified a previously unknown process that may, in fact, serve as the principal source of many dissolved chemical species in the ocean. Once controversial, studies over the past decade have supported her transformative idea, moving the hypothesis along a steady trajectory from highly controversial to its now established position in marine geochemistry.

The list of 2018 Geochemical Fellows is available on the European Association of Geochemistry (EAG) web page:

Version 2 - GEOTRACES Intermediate Data Product 2017

Please broadcast this announcement as largely as possible.
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  IDP2017 logo  

Version 2 now available!

An updated and corrected version of the GEOTRACES Intermediate Data Product 2017 is now available to download!

Digital data: for bulk download
 or to download subsets of data

eGEOTRACES Electronic Atlas:

Please see IDP2017 v2 changes document for further details on the revisions made. 

Download IDP2017 and use it!


logo scorJoint ft



RiO5 radiochemical methods now available

A SCOR Working Group, RiO5, has created an on-line radiochemical "cookbook" that may be of interest to the GEOTRACES community.  You can browse your favorite recipes by category (seawater, biota, filters, sediments), search by ingredient (elements/isotopes), author, or by detection methods.  You can freely download the latest and greatest recipes and some of the classics, each with step by step lab instructions for the processing of marine samples for detection of radionuclides via counting methods or mass spectrometry.

We are also invited on this site to contribute your own favorite recipes on line at any time. 

The easiest way to find it is via the CMER web site either clicking on the rotating image, or use the link in the top row of the banner. 

If you find any bugs, email

GEOTRACES at Ocean Sciences Meeting 2018


GEOTRACES will have a major presence at 2018 Ocean Sciences Meeting
(11-16 February, 2018, Portland, Oregon, USA,

This includes: 

SCOR Booth - GEOTRACES Town Halls - GEOTRACES Sessions

Please find the details below.


SCOR Booth
: GEOTRACES will participate with other international projects in a booth sponsored by SCOR. 

Booth #502 - Tuesday 13 February to Thursday 15 February, 2018, from 9:30 AM to 6:00 PM

Several members of the GEOTRACES Scientific Steering Commitee will be present at the SCOR booth to answer your questions. Check timetable showing who will be at the SCOR Booth at which times.

Come to visit us and pick up your eGEOTRACES USB card!


Town Hall: "Release of new GEOTRACES Data Product"

Wednesday, February 14, 2018, 
12:45 PM - 01:45 PM
Location: Oregon Convention Center -  Oregon Ballroom 201 Room has changed!

A limited number of lunch boxes will be provided


Description: GEOTRACES, an international study of the marine biogeochemical cycles of trace elements and their isotopes, has released its second data product (IDP2017).  The new data product expands greatly on the first collection of results released in 2014 in two important ways: 1) by adding a substantial body data from new cruises and 2) by adding additional datasets not available in the 2014 data product from cruises across the five world Oceans (e.g. aerosols, isotopes and biological parameters that support the emerging BioGEOTRACES initiative). This expanded set of parameters available in the IDP2017, ranging across micronutrients, contaminants, radioactive and stable isotopes and a broad suite of hydrographic parameters used to trace water masses provides an unprecedented means to understand the role of trace elements in shaping the functioning of the Ocean system.  We invite everyone to this town hall to learn about accessing IDP2017 and how it can be used for interdisciplinary research and teaching applications:

Organizers: Robert F Anderson, Columbia University of New York; Alessandro Tagliabue, University of Liverpool; Gregory A Cutter, Old Dominion University and Maite Maldonado, University of British Columbia.


Town Hall: "Developing a framework for trace element, isotope, and other biogeochemical research in the Gulf of Mexico and Caribbean Sea"

Tuesday, February 13, 2018, 12:45 PM - 01:45 PM
Location: Oregon Convention Center - Oregon Ballroom 201 Room has changed!
A limited number of lunch boxes will be provided

Description: In addition to their dynamical influence on the formation of the Gulf Stream, the Gulf of Mexico and Caribbean Sea are strongly affected by continental margin processes such as major river inputs and significant submarine groundwater discharges. GEOTRACES studies have increasingly demonstrated the importance of ocean margins in affecting trace element and isotope (TEI) fluxes to the open ocean. Given the importance of these marginal fluxes for cycling of carbon and nutrients, the Gulf of Mexico has been a regional focus for recent OCB activities. However, these activities, as well as the 2010 Deepwater Horizon oil spill, have revealed major gaps in our understanding of how inputs to the shelf influence biogeochemical and biological processes in open waters, especially with regard to TEIs. Most such Gulf studies have focused on the Louisiana and West Florida shelves, with little attention to open waters and interactions with the Loop Current. The steering committees of US GEOTRACES and OCB are beginning a conversation devoted to TEI research in the Gulf of Mexico and Caribbean. We invite GEOTRACES, OCB, and other ocean scientists interested in these marginal seas to discuss processes of interest, existing programs and data sets, and potential steps forward.

Organizers: Alan M Shiller, University of Southern Mississippi; Heather M Benway, Woods Hole Oceanographic Inst.; Robert F Anderson, Columbia University & Lamont-Doherty Earth Observatory; Angela N Knapp, Florida State University; Benjamin S Twining, Bigelow Lab for Ocean Sciences, Kristen N Buck, University of South Florida, Matthew A Charette, Woods Hole Oceanographic Institution and Bethany D Jenkins, University of Rhode Island.


GEOTRACES-related Town Hall: "Update on the Second International Indian Ocean Expedition

Monday, February 12, 2018,
12:45 PM - 01:45 PM

Location: Oregon Convention Center - D135-D136

Description: The second International Indian Ocean Expedition (IIOE-2) was launched on December 2015 and it will run through 2020 and beyond. This session will provide an update on international research activities that are being undertaken and planned in IIOE-2 and also report on the outcomes of a recent US Indian Ocean Science Planning workshop. The session will also present the mechanisms for involvement of interested scientists in IIOE-2 activities.

Organizers: Raleigh R Hood, Michael J McPhaden and Lynne D Talley.



GEOTRACES and GEOTRACES-related sessions (see session descriptions below):

Abiotic and Biotic Retention, Recycling, and Remineralization
of Metals in the Ocean

Primary Chair:  Philip W Boyd, University of Tasmania
Co-chairs:  Kristen N Buck, Jessica N Fitzsimmons and Alessandro Tagliabue
Monday, February 12, 2018, 4-6pm and Tuesday, February 13, 2018, 8-10 am
Posters: Monday, February 12, 2018, 4-6 pm

The Behavior of Trace Elements and Isotopes in Different Ocean Basins: New Insights from Comparisons and Contrasts

Primary Chair:  Gregory A Cutter, Old Dominion University

Co-chairs:  Adrian Burd, Jay Thomas Cullen and Tung-Yuan Ho
Wednesday, February 14, 2018, 8-10 am, 2-4 pm
Posters: Wednesday, February 14, 4-6 pm

The Dawn of BioGEOTRACES: Metal-Microbe Interactions in the Ocean

Primary Chair:  Adrian Marchetti, University of North Carolina
Co-chairs:  Maria Teresa Maldonado, Alessandro Tagliabue and Yeala Shaked
Thursday, February 15, 2018, 8 am-12:30 pm
Posters: Thursday, February 15, 2018, 4-6 pm

Biogeochemical Processes Across Oxic-Anoxic Transitions

Primary Chair:  Jeffry V Sorensen, University of Victoria
Co-chairs:  Roberta Claire Hamme and Tim M Conway

Monday, February 12, 2018, 8 am - 12:30pm
Posters:  Monday, February 12, 2018, 4-6 pm

Ocean Biogeochemistry and Air-Sea Interactions

Primary Chair:  Francesc Peters, Institute of Marine Sciences (ICM, CSIC)
Co-chairs:  William M Landing, Oliver Wurl and Brian Ward
Thursday, February 15, 2018, 2-4 pm and Friday, February 16, 2018, 8-10 am
Posters:  Wednesday, February 14, 2018, 4-6 pm

Bridging Microbial, Stable Isotope, and Micronutrient Approaches to Marine Carbon and Nitrogen Recycling
Primary Chair:  Patrick A Rafter, University of California Irvine

Co-Chair:  Robert T Letscher and Alexis Pasulka
Monday, February 12, 2018, 8-10 am
Posters:  Monday, February 12, 2018, 4-6 pm

GEOTRACES and GEOTRACES-related session descriptions:

Abiotic and Biotic Retention, Recycling, and Remineralization of Metals in the Ocean

Session Description:

Trace metals shape both the biogeochemical functioning and the biological structure of oceanic provinces, and considerable insight into trace metal distributions have been gleaned from international programs like GEOTRACES. To date, observational and modelling efforts have mainly focused on modes of external metal supply from different sources. While this has yielded important advances, we also know that metals undergo key internal transformations such as biotic uptake, scavenging, recycling, and remineralization.  These internal transformations play crucial roles in shaping the biogeochemical cycling of metals by governing their bioavailability, oceanic distributions, and residence times. In this session we solicit presentations that address key questions regarding the abiotic and biotic processes regulating (i) the retention timescale for metals in the upper ocean, (ii) surface ocean metal recycling and bioavailability, (iii) the subsurface regeneration length scales for metals in the ocean interior, and (iv) the role of mineral versus organic characteristics of sinking particles on metal scavenging.  We also seek presentations that provide insights into how these key questions are mediated by differing physico-chemical and microbial processes in contrasting ocean settings. Presentations showing insights from the diverse standpoints of biogeochemical oceanography and molecular ecology, from both observational and modelling perspectives, are strongly encouraged.

Primary Chair:  Philip W Boyd, University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, Australia

Co-chairs:  Kristen N Buck, University of South Florida Tampa, College of Marine Science, Tampa, FL, United States; University of South Florida, College of Marine Science, St. Petersburg, FL, United States, Jessica N Fitzsimmons, Texas A&M University, Department of Oceanography, United States and Alessandro Tagliabue, University of Liverpool, Liverpool, United Kingdom

The Behavior of Trace Elements and Isotopes in Different Ocean Basins: New Insights from Comparisons and Contrasts

Session Description:

Recent international programs such as GEOTRACES have been examining the biogeochemical cycling of trace elements and isotopes (TEIs) in the world’s oceans to reveal the mechanisms and rates affecting their concentrations, distributions, chemical forms, and interactions with organisms. In addition to studies by individual investigators, the accumulating results show many similarities, but some surprising differences between ocean basins, with a classic example being the regionally-specific Cd/PO4 relationships. In the same way that deviations from the Redfield ratio of N/P between ocean basins, known since the 1970s GEOSECS program, provide insight into nitrogen cycle processes, what can we learn from the comparisons and contrasts of TEIs, and what tools are needed to explore and test these observations? This session seeks presentations from the observational and modeling communities on lessons learned from inter basin TEI data sets with respect to inputs to, cycling within, and exports from the world’s oceans. In addition we invite contributions that consider how TEI distributions, their chemical speciation, and interactions with micro-organisms shape microbial community structure and productivity in various ocean basins.

Primary Chair:  Gregory A Cutter, Old Dominion University, Ocean, Earth and Atmospheric Sciences, Norfolk, VA, United States

Co-chairs:  Adrian Burd, University of Georgia, Athens, GA, United States, Jay Thomas Cullen, University of Victoria, Victoria, BC, Canada and Tung-Yuan Ho, Research Center for Environmental Changes Academia Sinica, Taipei, Taiwan

The Dawn of BioGEOTRACES: Metal-Microbe Interactions in the Ocean

Session Description:

Trace metals are essential for life, catalysing key cellular reactions which then govern patterns of ocean fertility and biodiversity. Fundamental in this regard are the ways in which ocean microbes acquire essential metals and how biological activity is affected by metal availability. Developments in this field are being led by advances in analytical chemistry, nanotechnology, molecular biology, and bioinformatics, as well as the expansion of 'omics'-related observations of in-situ microbial communities, and the advent of new high resolution geochemical data from the international GEOTRACES program. It is now timely to bring together insights from these different disciplines, spanning observation and modelling approaches to better understand how microbial activity, diversity and ecology is shaped by interactions with trace metals over different space and time scales. By linking across disciplines, there is the potential to develop the mechanistic understanding required to inform the ecological and biogeochemical models we rely on for testing hypotheses and projecting the impacts of ocean change. We are specifically interested in contributions that address (i) metal uptake and competition between microbes for metal resources, (ii) how microbes adapt their physiology to metal scarcity and varied supply and (iii) how trace metals shape cellular function and evolution.

Primary Chair:  Adrian Marchetti, University of North Carolina, at Chapel Hill, Department of Marine Sciences, Chapel Hill, NC, United States

Co-chairs:  Maria Teresa Maldonado, University of British Columbia, Vancouver, BC, Canada, Alessandro Tagliabue, University of Liverpool, Liverpool, United Kingdom and Yeala Shaked, Hebrew University, Interuniversity Institute for Marine Sciences,, Eilat, Israel

Biogeochemical Processes Across Oxic-Anoxic Transitions

Session Description:

A suite of metabolically and chemically important oxidation-reduction reactions occur through the transitions from oxic to anoxic regions of the ocean. These reactions drive nutrient availability and metal solubility, as well as organic matter production, consumption, and preservation. As oxygen minimum and deficient zones expand, redox reactions in low to no oxygen environments are becoming globally more important, both for the nitrogen and carbon cycles and also for trace metals. Understanding such environments can provide an important analogue for ocean chemistry and microbial life in the Precambrian, prior to the great oxygenation events. This session seeks to bring together geochemical, biological, and physical scientists working on low oxygen and anoxic regions, in order to create an integrated picture of biogeochemistry in these environments. Presentations from observational, experimental, or modeling standpoints on nutrients, trace elements, dissolved gases, isotope systematics, microbiology, biological productivity, or physical drivers in these regions are all invited. We especially encourage submissions investigating the redox transition in the water column or sediments of restricted basins such as Saanich Inlet and the Black Sea, as well as GEOTRACES and open-ocean studies of settings such as the Eastern Tropical Pacific, North Atlantic, and Indian OMZs.

Primary Chair:  Jeffry V Sorensen, University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada

Co-chairs:  Roberta Claire Hamme, University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada and Tim M Conway, University of South Carolina, Columbia, SC, United States

Ocean Biogeochemistry and Air-Sea Interactions

Session Description:

Studies of ocean biogeochemistry related to air-sea interactions are providing significant new information to help us understand a wide variety of physical, chemical and biological processes in the oceans. There are many processes that link the surface ocean and the lower atmosphere, for example, the release of biogenic compounds as sources of cloud or ice condensation nuclei, the deposition of natural and anthropogenic aerosols that can affect plankton communities, the transport of airborne microbes that can alter the dynamics of proximal and distant ecosystems, the biology, chemistry and physics of the sea-surface microlayer (SML) as the interface through which all exchanges between the atmosphere and the ocean occur, the enrichment of surfactants and other biogenic compounds in the SML that can affect gas exchange rates, etc. Understanding these processes is crucial for improving the reliability of regional and global models and the evaluation of future scenarios. We welcome contributions on all aspects of the physics, chemistry, and biology of air-sea interactions, including observations, experimentation, methodological or technical developments, and theoretical and modeling efforts.

Primary Chair:  Francesc Peters, Institute of Marine Sciences (ICM, CSIC), Barcelona, Spain

Co-chairs:  William M Landing, Florida State University, Department of Earth, Ocean, and Atmospheric Science, Tallahassee, FL, United States, Oliver Wurl, Carl von Ossietzky Universität Oldenburg, Institute for Chemistry and Biology of the Marine Environment, Wilhelmshaven, Germany and Brian Ward, National University of Ireland, Galway (NUIG), School of Physics, Galway, Ireland

Bridging Microbial, Stable Isotope, and Micronutrient Approaches to Marine Carbon and Nitrogen Recycling

Session Description:

The efficiency of the ocean’s biological carbon pump is determined by the physical transport and cycling of both macro- (N, P, Si, S, O) and micro-nutrients (e.g. Fe, Zn, Co, Cu, Cd, Ni, Mn, Mo, V, B, Se). However, even as our capability to measure nutrient concentrations and their isotopes have expanded to include basin-scale datasets, we continue to be challenged by new insights with respect to variable plankton and organic matter stoichiometry, lateral nutrient transport fluxes, ‘new’ vs. ‘recycled’ nutrients, metal-organics complexation, scavenging rates, variable remineralization rates, elemental residence times, and more. Here we welcome submissions that address macro- and micro-nutrient cycling and their effects on sustaining the marine carbon (e.g. export production) and nitrogen (e.g. nitrogen fixation, denitrification) cycles. A wide breadth of scales (meso, regional, basin, global; paleo, present, future) and scientific approaches to these questions are encouraged including observational, theoretical, modeling, and isotopic studies. Finally, we encourage submissions that work to bridge oceanographic disciplines.

Primary Chair:  Patrick A Rafter, University of California Irvine, Irvine, CA, United States

Co-Chair:  Robert T Letscher, University of New Hampshire, Earth Sciences, Durham, NH, United States and Alexis Pasulka, California Polytechnic State University

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