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. Please stop by and visit!

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


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

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
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

Postdoctoral research fellow position, Stellenbosch University, South Africa

Postdoctoral research fellow position to study bioactive trace elements to understand seasonal cycling of trace metals in Southern African and Antarctic coastal oceans:

The Trace Metal Experimental and Biogeochemistry Group (TracEx) within the Department of Earth Sciences, Stellenbosch University, Western Cape, South Africa, invites applications for a postdoctoral position. The broader research project examines the biogeochemical cycling of iron, copper and zinc and their link in controlling primary productivity. The postdoctoral fellow will apply geo-tracers to understand cycling and interaction of trace nutrient with phytoplankton to study Southern African and Antarctic coastal regions. Thus, preference will be given to applicants with expertise in clean room techniques and biogeochemistry of trace metals linked to physics of the ocean. Added experience in biogeochemical modelling, and knowledge of GIS and remote sensing will be advantageous.

The position will require fieldwork, participation in Southern Ocean cruises and travel, therefore physical fitness and ability to work long hours in harsh conditions is a pre-requisit. The applicant may assist with future proposal preparation and will have the opportunity to advise graduate students and, to some extent, if desired, support undergraduate teaching and outreach activities. Opportunities for interdisciplinary research exist through collaboration with the other groups in South Africa (e.g., oceanography, biotechnology) and internationally (e.g., GEOTRACES community).

Applicants should have a doctoral degree in a related discipline such as Oceanography, Earth Sciences, Biogeochemistry and a record of scientific research publications in scholarly journals relavent to this position.

The position is for 24 months, commencing from June of 2018 or earlier, subject to grant success. Renewal of the position for the second year is subject to performance and availability of funds. For further information about the project and to apply please contact Prof A Roychoudhury ( Application should include, as a single pdf document, a cover/motivation letter outlining experience and expertise relevant to the project, a comprehensive Résumé/CV and a short research statement. Please also provide the names and contact information of three professional referees.

Graduate Student position available at USF College of Marine Science, Florida

Masters in Chemical Oceanography at USF College of Marine Science

Project Description: Iron isotope cycling in a low-oxygen Fjord

Advisor: Dr. Tim Conway

Position to begin Fall 2018.

Iron is an essential micronutrient in biogeochemical systems, and in recent years iron isotopes have been used in order to constrain cycling and sources of iron to natural waters. Successful application of this tracer, especially in models of ocean biogeochemistry and for deep time reconstructions, requires a detailed understanding of how mechanisms such as anoxic-oxic cycling fractionate iron isotopes. This project thus aims to better understand the chemistry and fractionation of Fe isotopes across water-column anoxic-oxic transitions, making use of a water column time series collected from the Saanich Inlet, British Columbia over the winter-spring of 2016/2017, allowing investigation of seasonal cycling.

The student will measure Fe concentrations and isotopes in USF's new Tampa Bay Plasma Facility, which includes an ISO-6 Clean lab dedicated for seawater processing, a SeaFast system, Thermo HR-ICPMS Element XR and Thermo MC-ICPMS Neptune. The work will be interpreted in the context of the SaanDox project and will involve collaboration with other groups working on a large range of complementary parameters. There is also potential for extension to measure other redox-active isotope systems, modelling, and participate in other scientific cruises, as well as the opportunity to present work at international conferences.

Two years of funding and analysis costs are available for a Masters Student, and this project is ideal for a student interested in global biogeochemical cycling, isotope geochemistry and trace metals. Candidates must have or expect to have a strong undergraduate background in chemical, earth or physical science. Laboratory experience in geochemistry is desirable, but not required. We strongly encourage diverse applications and equal opportunities.

The USF College of Marine Science is located on the water in sunny St Petersburg, Florida, and hosts a vibrant community of graduate students and faculty undertaking world class research in a range of oceanographic disciplines. For more information about the college please visit

Apply online and view requirements  

Applications must be received before Feb 15th 2018.

Contact Tim Conway ( for more information.

Postdoctoral Investigator - Marine Chemistry and Geochemistry Department, WHOI, USA

Job Summary

Dr. Ken Buesseler in the Marine Chemistry and Geochemistry Department at WHOI is searching for a Postdoctoral Investigator to join his team. The initial appointment will start around mid-May, 2018 (with some flexibility in start date) with the possibility of an extension for up to two years or more. This position is considered exempt, full-time, and is eligible for benefits. Applications will be considered starting Feb. 1st and continue until a suitable applicant is chosen.

Job Details

The focus of the work is part of the larger NASA EXports Processes in the Ocean from RemoTe Sensing (EXPORTS) project, which seeks to further understand the ocean biological carbon pump. Planning is well underway for multi-ship interdisciplinary research cruises in August 2018 and as proposed, spring 2020. The successful applicant will play a major role in the collection of size-fractionated particles using in-situ pumps and analyses of carbon, major bioelements, and radionuclides (thorium-234), as well as the distribution of samples to other PI’s. The ideal candidate will bring to the program new analyses of particle phases that contribute to the overall success of the EXPORTS project. The successful applicant will be involved in all aspects of planning, field work, sample analyses, data management, manuscript preparation and presentations to EXPORTS PIs and the broader oceanographic community.

Desired Education and Experience

A PhD in chemical oceanography, biogeochemistry, analytical chemistry or a related field is required.

Prior research experience in areas related to the biological pump is helpful, but not essential, however a broad understanding of ocean biogeochemistry and C cycling will be needed. Analytical expertise may include prior work with radionuclides, biogenic elements and carbon, trace metals and isotopes, molecular and organic biomarkers and other tracers that can be used to track the source and fate of particulate organic carbon that is transformed via biological, physical and chemical processes in the surface and mid-water column. Prior experience at sea is advantageous, as the sea going field work is an essential component of this project.

Full details at WHOI HR web site

Contact Ken Buesseler ( for more information.

PhD position at University of Liverpool, UK

Project Description

Can Iron Isotopes Constrain the Ocean Iron Cycle?

The micronutrient iron has received growing attention in recent years due to its role in regulating biological activity over large areas of the ocean [Tagliabue et al., 2017]. While this has now highlighted that understanding the response of marine ecosystems to climate change will be underpinned by iron in many areas of the ocean, our ability to reproduce iron observations remains poor [Tagliabue et al., 2016]. One potential means to improve our understanding of different processes is by using iron isotopes. This is because there are important ‘fractionations’ in iron isotopes during specific iron cycle processes that then enrich or deplete different pools of iron in unique ways. Indeed, recent work has used iron isotopes to assess the role of iron sources [Conway and John, 2014], upper ocean recycling [Ellwood et al., 2015] and the balance between different processes along ocean transport pathways [Abadie et al., 2017]. If we had a good understanding of the importance of the relative influence of external sources and internal cycling (biological activity and scavenging) then Fe isotopes would be a powerful tool to understanding the mechanisms driving the ocean cycling of Fe. 

This PhD is fully funded by an ERC consolidator grant to Alessandro Tagliabue (, open to applicants of all nationalities and will be focussed on this exciting topic. The student and will embed a representation of the cycling iron isotopes in an existing state of the art iron model and conduct assessments of model skill and of the key underlying processes. It is expected to yield high impact publications and act as a catalyst to advancing this important aspect of ocean biogeochemistry. 

The project will involve close liaison with experts in the observation of iron isotopes and be co supervised by Seth John (USC, Los Angeles, USA) and Francois Lacan (LEGOS, Toulouse, France). There are specific funds allocated for visits to John and Lacan’s laboratories to develop the model further, as well as support to present the outcomes of the work at major international conferences. 

This project would be ideal for a student interested in global biogeochemical cycles and trace metal cycling, in particular. Ideally, the candidate will have a background in a biological, chemical or physical science and have strong numeracy skills. You will join a vibrant group of ocean scientists in Liverpool conducting world-class research. 

Deadline for applications: Friday, March 02, 2018

Apply on-line

Read more: PhD position at University of Liverpool, UK

Forthcoming departure of the Australian SR3-GEOTRACES section voyage in the Southern Ocean

SR3-GEOTRACES 2018 is an Australian led research expedition along the SR3 line (approximately 140ºE) from Hobart (Tasmania, Australia) to the Antarctic ice-edge. The goal of the SR3-GEOTRACES expedition is to determine the distributions of trace metals and isotopes (TEIs), their change with time, and the physical, chemical and biological processes controlling those evolving distributions. During 6 weeks, scientists will measure TEIs, nutrients, the carbon system and ocean physics along the SR3 section. Measurements of TEIs are scarce in the Southern Ocean, particularly on repeat sections and in deeper waters. TEI distributions on the SR3 line will be compared to expeditions in spring 2001 and late autumn 2008 to assess seasonal and longer-term changes.  The section will also sample for TEIs in marine particles, and stable, radioactive and radiogenic isotopes that have not been measured before in this sector of the Southern Ocean. We will also sample for TEIs in aerosol particles, and metagenomic analyses will be used to characterise the structure and function of the microbial community as a function of latitude and depth along the repeat transects.

The SR3-GEOTRACES voyage aboard the RV Investigator will depart from Hobart (Australia) on 10th January 2018 and return back to Hobart on 21st February 2018, and will include 40 scientists and technical support staff from 6 nations. The voyage will sail along the GEOTRACES International section GS01 (please see cruise track below). The expedition will also include projects on ocean physics and carbon cycling along SR3, together with the CAPRICORN project evaluating satellite cloud, aerosol, precipitation, and surface flux products over the Southern Ocean.

GS01 track3Figure: Australian SR3-GEOTRACES cruise track.

Want to learn more about this cruise?

 Data Product (IDP2017)


 Data Assembly Centre (GDAC)


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