http://lod.bco-dmo.org/id/dataset/1002058 eng; USA utf8 dataset Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact 2026-07-06 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) pFe concentrations and isotopes of GP17-OCE from the GP17-OCE dissolved trace metals and their isotopes project 2026-07-06 publication 2026-07-06 revision BCO-DMO Linked Data URI 2026-07-06 creation http://lod.bco-dmo.org/id/dataset/1002058 Jessica N. Fitzsimmons Texas A&M University principalInvestigator Timothy M. Conway University of South Florida principalInvestigator Seth G. John University of Southern California principalInvestigator Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. publisher Cite this dataset as: (2026) pFe concentrations and isotopes of GP17-OCE. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-07-06 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/1002058 [access date] pFe concentrations and isotopes of GP17-OCE Dataset Description: Methods and Sampling: &lt;p&gt;&lt;strong&gt;Sample source and treatment&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;&lt;strong&gt;Total phase&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;An aliquot (0.5 mL) of the total digest described in Ohnemus et al. (2015) were provided by D. Ohnemus and M. Ricci. Aliquots of the leachate containing a known quantity of Fe were then spiked with an Fe-57-Fe-58 double-spike and purified by anion exchange chromatography and Fe concentration and d&lt;sup&gt;56&lt;/sup&gt;Fe were measured by Thermo Neptune Plus multi-collector ICP-MS.&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;&lt;strong&gt;Labile phase&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;A subsample of 0.8 - 51 um-sized suspended particles collected using McLane in situ pumps on the GP17-OCE cruise was provided by D. Ohnemus. Details of the sampling methodology are described in Ohnemus &amp;amp; Lam (2015). For a small number of samples, a low volume of seawater drawn through the filter resulted in unreliable data (see Data Processing).&lt;/p&gt; &lt;p&gt;The &quot;labile&quot; phase of the suspended particles was determined by leaching with a pH 8 solution of 0.1M oxalic acid and 0.05M EDTA for 2 hours at 90 C. Method is described in Revels et al (2015). Concentrations of Fe in the labile phase were determined by analysis of the leachate on an Agilent 8900 QQQ ICPMS. Samples were run alongside blanks and standards prepared in the same matrix, with all samples, blanks and standards spiked with In as an internal standard. Repeat analyses of blanks and standards were carried out throughout analysis sequences as a further check on instrumental drift and reproducibility of data.&lt;/p&gt; &lt;p&gt;Aliquots of the leachate containing a known quantity of Fe were then spiked with an Fe-57-Fe-58 double-spike and purified by anion exchange chromatography and Fe concentration and d&lt;sup&gt;56&lt;/sup&gt;Fe were measured by Thermo Neptune Plus multi-collector ICP-MS. The method is fully described in Revels et al (2015).&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;&lt;strong&gt;References:&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;D.C. Ohnemus and P.J. Lam (2015) Cycling of lithogenic marine particles in the US GEOTRACES North Atlantic transect. Deep-Sea Research II 116, 283-302. doi:&lt;u&gt;10.1016/j.dsr2.2014.11.019&lt;/u&gt;&lt;br /&gt; B.N. Revels, D.C. Ohnemus, P.J. Lam, T.M. Conway, S.G. John (2015) The isotopic signature and distribution of particulate iron in the North Atlantic Ocean. Deep-Sea Research II 116, 321-331. doi:&lt;u&gt;10.1016/j.dsr2.2014.12.004&lt;/u&gt;&lt;/p&gt; Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2049639 Award URL: https://www.nsf.gov/awardsearch/show-award/?AWD_ID=2049639 onGoing Jessica N. Fitzsimmons Texas A&M University 979-845-5137 3146 TAMU O&M 403AB College Station TX 77843 USA jessfitz@tamu.edu pointOfContact Timothy M. Conway University of South Florida 727-258-1081 College of Marine Sciences 830 1st St SE St. Petersburg FL 33701 USA tmconway@usf.edu pointOfContact Seth G. John University of Southern California 213-740-0696 USC ZHS 117 2651 Trousdale Pkwy. Los Angeles CA 90089 USA sethjohn@usc.edu pointOfContact asNeeded Dataset Version: 1 Unknown Agilent 8900 QQQ ICP-MS Neptune Plus multi-collector ICP-MS (Thermo) theme None, User defined Inductively Coupled Plasma Mass Spectrometer Thermo Fisher Scientific Neptune Plus inductively coupled plasma mass spectrometer instrument BCO-DMO Standard Instruments otherRestrictions otherRestrictions Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use. Collaborative Research: US GEOTRACES GP17-OCE: Dissolved concentrations, isotopes, and colloids of the bioactive trace metals https://osprey.bco-dmo.org/project/1000114 Collaborative Research: US GEOTRACES GP17-OCE: Dissolved concentrations, isotopes, and colloids of the bioactive trace metals <p>The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. Many trace metals, which are by definition present in very low amounts, are essential for life and thus considered nutrients for phytoplankton growth. Other elements can be useful for tracing other ocean processes, and some (such as lead) are important because they are pollutants. This project will address three main objectives: 1) to measure the dissolved concentrations and size partitioning of micronutrients iron, manganese, zinc, copper, cadmium, nickel, and pollutant lead in seawater from Tahiti towards Antarctica and then back northeast to South America; 2) to analyze the isotope ratios - the relative abundance of different forms of the same chemical element - of iron, zinc, cadmium, nickel, and copper in seawater, suspended particles, aerosols, and porewaters from this section, as isotopes provide diagnostic insights into sources, sinks, and metal transformations beyond what is provided by concentration measurements alone; and 3) to use ocean models to constrain the rates of ocean processes and effects of ocean circulation on trace metal and isotope distributions. This project spans three US labs, and four graduate students and several undergraduate students will participate. It will also provide ultrafiltered samples and data to several other collaborating groups as a service.</p> <p> The U.S. GEOTRACES GP17-OCE expedition, planned for late 2021 or 2022, aims to determine the distribution of trace elements and isotopes along a transect spanning regions of global importance to nutrient and carbon cycling, crossing the South Pacific Gyre, the iron-limited waters of the Antarctic Circumpolar Current, Pacific Deep Waters with hydrothermal inputs, and waters near the Chilean margin. The South Pacific Gyre and Pacific sector of the Southern Ocean are climate-critical regions for the transfer of heat, carbon, and nutrients within the global ocean, and they are a region where phytoplankton growth is typically limited by low concentrations of iron (Fe) in the surface ocean. The investigators will use a variety of analytical approaches, along with analyses made by other project collaborators, to address four major objectives related to dissolved micronutrient biogeochemistry in this region: 1) What are the relative fluxes of dissolved metals from dust, sediments, and Antarctic continental inputs to surface waters of the South Pacific gyre and ACC waters? 2) What fluxes of trace metals, especially Fe, are delivered by Pacific Deep Water to the Southern Ocean for upwelling to the surface waters? Are these fluxes hydrothermal or benthic in origin? Are dissolved metals supplied by the Pacific-Antarctic Ridge to the abyssal Southern Ocean? 3) How do micronutrient metal uptake stoichiometries change across gradients of primary production, community composition, and nutrient limitation from the gyre to ACC waters? How are these affected by metal speciation? 4) How do pre-formed biological signatures in surface waters, combined with regeneration and scavenging along the transport path, influence the regional and global distribution of TEIs?</p> <p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p> GP17-OCE dissolved trace metals and their isotopes largerWorkCitation project eng; USA oceans 2026-07-06 0 BCO-DMO catalogue of parameters from pFe concentrations and isotopes of GP17-OCE from the GP17-OCE dissolved trace metals and their isotopes project Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact https://osprey.bco-dmo.org/dataset/1002058/data/download download onLine dataset &lt;p&gt;&lt;strong&gt;Sample source and treatment&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;&lt;strong&gt;Total phase&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;An aliquot (0.5 mL) of the total digest described in Ohnemus et al. (2015) were provided by D. Ohnemus and M. Ricci. Aliquots of the leachate containing a known quantity of Fe were then spiked with an Fe-57-Fe-58 double-spike and purified by anion exchange chromatography and Fe concentration and d&lt;sup&gt;56&lt;/sup&gt;Fe were measured by Thermo Neptune Plus multi-collector ICP-MS.&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;&lt;strong&gt;Labile phase&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;A subsample of 0.8 - 51 um-sized suspended particles collected using McLane in situ pumps on the GP17-OCE cruise was provided by D. Ohnemus. Details of the sampling methodology are described in Ohnemus &amp;amp; Lam (2015). For a small number of samples, a low volume of seawater drawn through the filter resulted in unreliable data (see Data Processing).&lt;/p&gt; &lt;p&gt;The &quot;labile&quot; phase of the suspended particles was determined by leaching with a pH 8 solution of 0.1M oxalic acid and 0.05M EDTA for 2 hours at 90 C. Method is described in Revels et al (2015). Concentrations of Fe in the labile phase were determined by analysis of the leachate on an Agilent 8900 QQQ ICPMS. Samples were run alongside blanks and standards prepared in the same matrix, with all samples, blanks and standards spiked with In as an internal standard. Repeat analyses of blanks and standards were carried out throughout analysis sequences as a further check on instrumental drift and reproducibility of data.&lt;/p&gt; &lt;p&gt;Aliquots of the leachate containing a known quantity of Fe were then spiked with an Fe-57-Fe-58 double-spike and purified by anion exchange chromatography and Fe concentration and d&lt;sup&gt;56&lt;/sup&gt;Fe were measured by Thermo Neptune Plus multi-collector ICP-MS. The method is fully described in Revels et al (2015).&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;&lt;strong&gt;References:&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;D.C. Ohnemus and P.J. Lam (2015) Cycling of lithogenic marine particles in the US GEOTRACES North Atlantic transect. Deep-Sea Research II 116, 283-302. doi:&lt;u&gt;10.1016/j.dsr2.2014.11.019&lt;/u&gt;&lt;br /&gt; B.N. Revels, D.C. Ohnemus, P.J. Lam, T.M. Conway, S.G. John (2015) The isotopic signature and distribution of particulate iron in the North Atlantic Ocean. Deep-Sea Research II 116, 321-331. doi:&lt;u&gt;10.1016/j.dsr2.2014.12.004&lt;/u&gt;&lt;/p&gt; Specified by the Principal Investigator(s) &lt;p&gt;&lt;strong&gt;Data Processing&lt;/strong&gt;&lt;/p&gt; &lt;p&gt;All concentration data has been corrected for &quot;dipped filter&quot;&amp;nbsp;blanks – filters that were deployed on each cast but did not have any seawater pumped through them. For each element, concentrations from all dipped filter blanks were averaged. The median dipped filter blank has been subtracted from this data. The given uncertainties in concentration data were calculated by propagating uncertainties from instrument precision and the standard deviation of dipped filter blanks. Detection limits are defined as three times the standard deviation of the dipped filter blanks. Concentrations below detection limit are identified as &quot;BDL&quot;.&lt;/p&gt; &lt;p&gt;Iron isotope measurements have been corrected for the leach reagent blank and uncertainties were calculated by an isotope mass balance equation involving the instrument precision and the mean and standard deviation of the reagent blank (equation 2 in Revels et al (2015)).&lt;br /&gt; &amp;nbsp;&lt;/p&gt; &lt;p&gt;All isotope data was reduced by using Excel 2016 with home-made data reduction algorithms following the iterative method described in Siebert et al. (2001)&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;Data have been giving the following quality flags:&lt;br /&gt; 2 – good data&lt;br /&gt; 3 – suspect data&lt;br /&gt; 4 – bad data&lt;br /&gt; 5 – no data&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; &lt;p&gt;Reference&lt;/p&gt; &lt;p&gt;Revels, B. N., Ohnemus, D. C., Lam, P. J., Conway, T. M., &amp;amp; John, S. G., 2015. The isotopic signature and distribution of particulate iron in the North Atlantic Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 116, 321–331. https://doi.org/10.1016/j.dsr2.2014.12.004&lt;/p&gt; &lt;p&gt;Siebert, C., Nägler, T.F., Kramers, J.D., 2001. Determination of molybdenum isotope fractionation by double-spike multicollector inductively coupled plasma mass spectrometry. Geochemistry, Geophysics, Geosystems 2. https://doi.org/10.1029/2000GC000124&lt;/p&gt; Specified by the Principal Investigator(s) asNeeded 7.x-1.1 Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact Agilent 8900 QQQ ICP-MS Agilent 8900 QQQ ICP-MS PI Supplied Instrument Name: Agilent 8900 QQQ ICP-MS PI Supplied Instrument Description:Concentrations of Fe in the labile phase were determined by analysis of the leachate on an Agilent 8900 QQQ ICPMS. Instrument Name: Inductively Coupled Plasma Mass Spectrometer Instrument Short Name:ICP Mass Spec Instrument Description: An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/ Neptune Plus multi-collector ICP-MS (Thermo) Neptune Plus multi-collector ICP-MS (Thermo) PI Supplied Instrument Name: Neptune Plus multi-collector ICP-MS (Thermo) PI Supplied Instrument Description:Used to measure Fe concentration and δ⁵⁶Fe isotope ratios for both total and labile particulate phases, following Fe-57-Fe-58 double-spiking and purification by anion exchange chromatography. Instrument Name: Thermo Fisher Scientific Neptune Plus inductively coupled plasma mass spectrometer Instrument Short Name:Thermo Scientific Neptune Plus ICP-MS Instrument Description: A laboratory high mass resolution inductively coupled plasma mass spectrometer (ICP-MS) designed for elemental and isotopic analysis. The instrument is based on a multicollector platform and combines the features of high mass resolution, variable multicollection and multiple ion counting (MIC). The Neptune Plus includes a Jet interface for increased sensitivity, a dual RPQ option and multiple discrete dynode electron multipliers for higher dynamic ranges, linearity and stability.