http://lod.bco-dmo.org/id/dataset/884673
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
2022-12-01
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Dissolved concentrations and stable isotope ratios of Fe, Zn, and Cd from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018
2022-12-06
publication
2022-12-06
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2022-12-22
publication
https://doi.org/10.26008/1912/bco-dmo.884673.1
Timothy M. Conway
University of South Florida
principalInvestigator
Seth G. John
University of Southern California
principalInvestigator
Matthias Sieber
University of South Florida
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: Conway, T. M., John, S. G., Sieber, M. (2022) Dissolved concentrations and stable isotope ratios of Fe, Zn, and Cd from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2022-12-06 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.884673.1 [access date]
GP15 Fe Zn Cd Dissolved and Stable Isotope Ratios - Leg 2 Dataset Description: Methods and Sampling: <p>Seawater samples were collected using the GEOTRACES trace-metal clean sampling system (rosette with 24 12-liter GO-FLO bottles) or a towfish for surface samples (Cutter and Bruland, 2012). Samples were filtered through acid-cleaned AcroPak capsule filters (0.2 micrometers (μm)) into acid-cleaned LDPE bottles. For concentration and isotope analysis at the University of South Florida (USF), 2 liters of filtered seawater were collected, acidified ashore at USF by addition of 2.4 milliliters (mL) 10 molar (M) Teflon-distilled HCl, and stored for at least 12 months at pH ∼2 before processing.</p>
<p>Seawater samples were processed for isotope analysis following Sieber et al. (2019). Briefly, a double-spike for cadmium (Cd), iron (Fe), and zinc (Zn) was added prior to batch extraction using Nobias PA-1 chelating resin, followed by purification by anion-exchange chromatography using AG-MP1 resin. Isotope analyses were performed on a Thermo Neptune Plus MC-ICPMS in the Tampa Bay Plasma Facility at the University of South Florida using an Apex-Q (Cd) or Apex Ω (Fe, Zn) introduction system.</p>
<p>We express Cd stable isotope ratios in delta notation (δ<sup>114</sup>Cd) relative to the NIST SRM-3108 Cd standard. A secondary standard, BAM-I012, was analyzed over 8 sessions on the same timescale as the samples to provide an estimate of long-term instrumental precision. We obtain a value of −1.32 ± 0.06‰ (2SD, n = 172), in agreement with consensus values (Abouchami et al., 2013). Using the 2SD of offsets from the mean of full replicate measurements based on 26 pairs of replicate analysis on separate seawater samples collected at the same depth (the GP15 sampling strategy collected overlapping samples between casts), we obtain a second estimate of external precision (0.05‰), which is similar to analytical precision. Therefore, we consider a 2SD uncertainty of 0.06‰ as a conservative estimate of analytical precision, and have applied it to all samples, except for low-concentration samples where the larger internal error is considered a more conservative estimate of uncertainty. Concentrations were calculated using the isotope dilution technique based on on-peak blank, interference and mass-bias corrected <sup>114</sup>Cd/<sup>111</sup>Cd ratios measured simultaneously with isotope analyses (Sieber et al., 2019). We express uncertainty (1SD) on Cd concentrations as 2%, based on replicate analysis on separate seawater samples collected at the same depth (n = 26).</p>
<p>We express Fe stable isotope ratios in delta notation (δ<sup>56</sup>Fe) relative to the IRMM-014 standard. A secondary Fe standard, NIST-3126, was analyzed over 44 sessions to provide an estimate of long-term instrumental precision. We obtain a value of +0.36 ± 0.05‰ (2SD, n = 604), in agreement with consensus values (Conway et al., 2013). As a second estimate of external precision, we use the 2SD of offsets from the mean of full replicate measurements based on 26 pairs of replicate analysis using separate seawater samples collected at the same depth (0.08‰), which is similar to the analytical precision. Therefore, we consider a 2SD uncertainty of 0.05‰ as an estimate of analytical precision, and have applied it to all samples, except for low-concentration samples where the larger internal error is considered a more conservative estimate of uncertainty. Concentrations were calculated using the isotope dilution technique based on on-peak blank, interference and mass-bias corrected <sup>57</sup>Fe/<sup>56</sup>Fe ratios measured simultaneously with isotope analysis. We express uncertainty (1SD) on Fe concentrations as 2%, based on replicate analysis on separate seawater samples collected at the same depth (n = 26).</p>
<p>We express Zn stable isotope ratios in delta notation (δ<sup>66</sup>Zn) relative to the JMC-Lyon standard. A secondary Zn standard, AA-ETH, was analyzed on the same timescale as the samples (over 10 sessions) to provide an estimate of long-term instrumental precision. We obtain a value of +0.28 ± 0.03‰ (2SD, n = 147), in agreement with consensus values (Archer et al., 2017). As a second estimate of external precision, we use the 2SD of offsets from the mean of full replicate measurements based on 26 pairs of replicate analysis using separate seawater samples collected at the same depth (0.03‰), which is similar to the analytical precision. Therefore, we consider a 2SD uncertainty of 0.03‰ as an estimate of analytical precision, and have applied it to all samples, except for low-concentration samples where the larger internal error is considered a more conservative estimate of uncertainty. Concentrations were calculated using the isotope dilution technique based on on-peak blank, interference and mass-bias corrected <sup>67</sup>Zn/<sup>66</sup>Zn ratios measured simultaneously with isotope analysis. We express uncertainty (1SD) on Zn concentrations as 5%, based on replicate analysis on separate seawater samples collected at the same depth (n = 26).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1737136 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1737136
completed
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
Matthias Sieber
University of South Florida
sieberm@usf.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Station_ID
Start_ISO_DateTime_UTC
End_ISO_DateTime_UTC
Start_Latitude
Start_Longitude
End_Latitude
End_Longitude
Cast_number
Event_ID
Sample_ID
Sample_Depth
Fe_56_54_D_DELTA_BOTTLE_bodzi6
SD2_Fe_56_54_D_DELTA_BOTTLE_bodzi6
Flag_Fe_56_54_D_DELTA_BOTTLE_bodzi6
Cd_D_CONC_BOTTLE_igyghz
SD1_Cd_D_CONC_BOTTLE_igyghz
Flag_Cd_D_CONC_BOTTLE_igyghz
Cd_114_110_D_DELTA_BOTTLE_ikpkep
SD2_Cd_114_110_D_DELTA_BOTTLE_ikpkep
Flag_Cd_114_110_D_DELTA_BOTTLE_ikpkep
Fe_D_CONC_BOTTLE_kroefs
SD1_Fe_D_CONC_BOTTLE_kroefs
Flag_Fe_D_CONC_BOTTLE_kroefs
Cd_D_CONC_FISH_6fkamf
SD1_Cd_D_CONC_FISH_6fkamf
Flag_Cd_D_CONC_FISH_6fkamf
Zn_66_64_D_DELTA_BOTTLE_mcjbhp
SD2_Zn_66_64_D_DELTA_BOTTLE_mcjbhp
Flag_Zn_66_64_D_DELTA_BOTTLE_mcjbhp
Fe_56_54_D_DELTA_FISH_65u814
SD2_Fe_56_54_D_DELTA_FISH_65u814
Flag_Fe_56_54_D_DELTA_FISH_65u814
Zn_D_CONC_BOTTLE_arrnao
SD1_Zn_D_CONC_BOTTLE_arrnao
Flag_Zn_D_CONC_BOTTLE_arrnao
Zn_66_64_D_DELTA_FISH_6o34bc
SD2_Zn_66_64_D_DELTA_FISH_6o34bc
Flag_Zn_66_64_D_DELTA_FISH_6o34bc
Zn_D_CONC_FISH_okrvqj
SD1_Zn_D_CONC_FISH_okrvqj
Flag_Zn_D_CONC_FISH_okrvqj
Cd_114_110_D_DELTA_FISH_rqkhol
SD2_Cd_114_110_D_DELTA_FISH_rqkhol
Flag_Cd_114_110_D_DELTA_FISH_rqkhol
Fe_D_CONC_FISH_yau1bo
SD1_Fe_D_CONC_FISH_yau1bo
Flag_Fe_D_CONC_FISH_yau1bo
towfish
Trace-metal clean sampling system
Thermo Neptune Plus MC-ICPMS
theme
None, User defined
station
ISO_DateTime_UTC
latitude
longitude
cast
event
sample identification
depth
Iron
quality flag
Cadmium
Zinc
featureType
BCO-DMO Standard Parameters
GeoFish Towed near-Surface Sampler
GO-FLO Teflon Trace Metal Bottle
Multi Collector Inductively Coupled Plasma Mass Spectrometer
instrument
BCO-DMO Standard Instruments
RR1815
service
Deployment Activity
Hilo, HI to Papeete, French Polynesia
place
Locations
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.
U.S. GEOTRACES
http://www.geotraces.org/
U.S. GEOTRACES
GEOTRACES is a SCOR sponsored program; and funding for program infrastructure development is provided by the U.S. National Science Foundation.
GEOTRACES gained momentum following a special symposium, S02: Biogeochemical cycling of trace elements and isotopes in the ocean and applications to constrain contemporary marine processes (GEOSECS II), at a 2003 Goldschmidt meeting convened in Japan. The GEOSECS II acronym referred to the Geochemical Ocean Section Studies To determine full water column distributions of selected trace elements and isotopes, including their concentration, chemical speciation, and physical form, along a sufficient number of sections in each ocean basin to establish the principal relationships between these distributions and with more traditional hydrographic parameters;
* To evaluate the sources, sinks, and internal cycling of these species and thereby characterize more completely the physical, chemical and biological processes regulating their distributions, and the sensitivity of these processes to global change; and
* To understand the processes that control the concentrations of geochemical species used for proxies of the past environment, both in the water column and in the substrates that reflect the water column.
GEOTRACES will be global in scope, consisting of ocean sections complemented by regional process studies. Sections and process studies will combine fieldwork, laboratory experiments and modelling. Beyond realizing the scientific objectives identified above, a natural outcome of this work will be to build a community of marine scientists who understand the processes regulating trace element cycles sufficiently well to exploit this knowledge reliably in future interdisciplinary studies.
Expand "Projects" below for information about and data resulting from individual US GEOTRACES research projects.
U.S. GEOTRACES
largerWorkCitation
program
US GEOTRACES Pacific Meridional Transect (GP15)
http://www.geotraces.org/
US GEOTRACES Pacific Meridional Transect (GP15)
<p>A 60-day research cruise took place in 2018 along a transect form Alaska to Tahiti at 152° W. A description of the project titled "<em>Collaborative Research: Management and implementation of the US GEOTRACES Pacific Meridional Transect</em>", funded by NSF, is below. Further project information is available on the <a href="https://www.geotraces.org/" target="_blank">US GEOTRACES website</a> and on the <a href="https://geotraces-gp15.com/" target="_blank">cruise blog</a>. A detailed <a href="https://datadocs.bco-dmo.org/docs/geotraces/GEOTRACES_PMT/casciotti/data_docs/GP15_Cruise_Report_with_ODF_Report.pdf" target="_blank">cruise report is also available</a> as a PDF.</p>
<p><em>Description from NSF award abstract:</em><br />
GEOTRACES is a global effort in the field of Chemical Oceanography in which the United States plays a major role. The goal of the GEOTRACES program is to understand the distributions of many elements and their isotopes in the ocean. Until quite recently, these elements could not be measured at a global scale. Understanding the distributions of these elements and isotopes will increase the understanding of processes that shape their distributions and also the processes that depend on these elements. For example, many "trace elements" (elements that are present in very low amounts) are also important for life, and their presence or absence can play a vital role in the population of marine ecosystems. This project will launch the next major U.S. GEOTRACES expedition in the Pacific Ocean between Alaska and Tahiti. The award made here would support all of the major infrastructure for this expedition, including the research vessel, the sampling equipment, and some of the core oceanographic measurements. This project will also support the personnel needed to lead the expedition and collect the samples.</p>
<p>This project would support the essential sampling operations and infrastructure for the U.S. GEOTRACES Pacific Meridional Transect along 152° W to support a large variety of individual science projects on trace element and isotope (TEI) biogeochemistry that will follow. Thus, the major objectives of this management proposal are: (1) plan and coordinate a 60 day research cruise in 2018; (2) obtain representative samples for a wide variety of TEIs using a conventional CTD/rosette, GEOTRACES Trace Element Sampling Systems, and in situ pumps; (3) acquire conventional CTD hydrographic data along with discrete samples for salinity, dissolved oxygen, algal pigments, and dissolved nutrients at micro- and nanomolar levels; (4) ensure that proper QA/QC protocols are followed and reported, as well as fulfilling all GEOTRACES intercalibration protocols; (5) prepare and deliver all hydrographic data to the GEOTRACES Data Assembly Centre (via the US BCO-DMO data center); and (6) coordinate all cruise communications between investigators, including preparation of a hydrographic report/publication. This project would also provide baseline measurements of TEIs in the Clarion-Clipperton fracture zone (~7.5°N-17°N, ~155°W-115°W) where large-scale deep sea mining is planned. Environmental impact assessments are underway in partnership with the mining industry, but the effect of mining activities on TEIs in the water column is one that could be uniquely assessed by the GEOTRACES community. In support of efforts to communicate the science to a wide audience the investigators will recruit an early career freelance science journalist with interests in marine science and oceanography to participate on the cruise and do public outreach, photography and/or videography, and social media from the ship, as well as to submit articles about the research to national media. The project would also support several graduate students.</p>
U.S. GEOTRACES PMT
largerWorkCitation
project
Collaborative research: US GEOTRACES PMT: Trace-metal concentrations and stable isotopes in the North Pacific
https://osprey.bco-dmo.org/project/883854
Collaborative research: US GEOTRACES PMT: Trace-metal concentrations and stable isotopes in the North Pacific
<p><em>NSF Award Abstract:</em><br />
The goal of the international GEOTRACES program is to understand the distributions of many chemical elements and their isotopes in the oceans. The National Science Foundation is supporting a U.S. GEOTRACES sampling expedition in the Pacific Ocean 2018, from Alaska to Tahiti. This award will focus on measurement of the stable isotopes of iron (Fe), nickel (Ni), zinc (Zn), copper (Cu), and cadmium (Cd) in seawater, filtered particles, and atmospheric aerosol particles on this expedition. The trace metals Fe, Ni, Zn, Cu, and Cd strongly influence marine biogeochemistry and carbon cycling. Measurements of isotope ratios -- the relative abundance of different forms of the same chemical element -- provide insights not possible from concentration measurements alone. The investigators will use isotope data to learn more about the inputs and outputs of these elements to the ocean as well as the biological processes that influence their distributions within the oceans, leading to greater understanding of the role these metals play in oceanic carbon cycling. The award will also host an international inter-lab comparison exercise for Cd isotope ratios at low concentrations in seawater. The project will support an early career investigator, a postdoctoral researcher, and undergraduate and graduate students.</p>
<p>The investigators will measure delta-56Fe, delta-60Ni, delta-65Cu, delta-66Zn, and delta-114Cd at high spatial resolution along the U.S. GEOTRACES Pacific Meridional Transect (PMT). The resulting oceanic sections of all five isotope systems will enable them to distinguish between competing ideas about the controls on trace metal distributions. A wide variety of hypotheses about marine biogeochemical trace metal cycling, addressing topics of global importance will be explored and tested, including: 1) How do different sources, productivity and export regimes, coupled with overturning circulation, control the distribution of Fe, Ni, Zn, Cu and Cd and their isotopes in the Pacific? 2) Do oxygen minimum zones act as sinks for Cd, Zn, Cu and Ni, while acting as sources for Fe? and 3) What sources are most important for supplying Fe to the North Pacific Ocean? The PMT section crosses two high nutrient-low chlorophyll (HNLC) regions and two oligotrophic gyres, as well as transecting the oldest waters in the ocean, allowing the investigators to use high-resolution isotope datasets to investigate competing hypotheses about the effect of vertical, horizontal and in situ biogeochemical processes on the distribution of all five metals and their isotopes. Aerosol dust, volcanogenic and reducing margin sediments, and hydrothermal vents such as the East Pacific Rise have all been hypothesized as major contributors to the dissolved Fe cycle in the Pacific. Measurement of iron isotope signatures in aerosols and near to oceanic sources will enable the identification and quantification the importance of these different iron sources and processes in supplying iron to the iron-limited surface ocean, especially important for the two HNLC regions along the PMT section.</p>
PMT TM Stable Isotopes
largerWorkCitation
project
eng; USA
oceans
Hilo, HI to Papeete, French Polynesia
-155.258
-151.992
-20
18.906
2018-10-25
2018-11-22
From projects that focused on the following 2 locations: 1. Pacific Meridional Transect along 152W (GP15) 2. North Pacific
0
BCO-DMO catalogue of parameters from Dissolved concentrations and stable isotope ratios of Fe, Zn, and Cd from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018
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
http://lod.bco-dmo.org/id/dataset-parameter/884918.rdf
Name: Station_ID
Units: unitless
Description: <p>Sampling station ID</p>
http://lod.bco-dmo.org/id/dataset-parameter/884919.rdf
Name: Start_ISO_DateTime_UTC
Units: unitless
Description: <p>Date and time (UTC) of start of sampling in ISO 8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/884920.rdf
Name: End_ISO_DateTime_UTC
Units: unitless
Description: <p>Date and time (UTC) of end of sampling in ISO 8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/884921.rdf
Name: Start_Latitude
Units: degrees North
Description: <p>Latitude of station location</p>
http://lod.bco-dmo.org/id/dataset-parameter/884922.rdf
Name: Start_Longitude
Units: degrees East
Description: <p>Longitude of station location</p>
http://lod.bco-dmo.org/id/dataset-parameter/884923.rdf
Name: End_Latitude
Units: degrees North
Description: <p>Latitude of station location</p>
http://lod.bco-dmo.org/id/dataset-parameter/884924.rdf
Name: End_Longitude
Units: degrees East
Description: <p>Longitude of station location</p>
http://lod.bco-dmo.org/id/dataset-parameter/884925.rdf
Name: Cast_number
Units: unitless
Description: <p>Cast number</p>
http://lod.bco-dmo.org/id/dataset-parameter/884926.rdf
Name: Event_ID
Units: unitless
Description: <p>Event number</p>
http://lod.bco-dmo.org/id/dataset-parameter/884927.rdf
Name: Sample_ID
Units: unitless
Description: <p>Unique GEOTRACES sample number</p>
http://lod.bco-dmo.org/id/dataset-parameter/884928.rdf
Name: Sample_Depth
Units: meters (m)
Description: <p>Sample depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/884929.rdf
Name: Fe_56_54_D_DELTA_BOTTLE_bodzi6
Units: per mil
Description: <p>Atom ratio of dissolved Fe isotopes expressed in conventional delta notation (from bottle samples)</p>
http://lod.bco-dmo.org/id/dataset-parameter/884930.rdf
Name: SD2_Fe_56_54_D_DELTA_BOTTLE_bodzi6
Units: per mil
Description: <p>Error (2SD) of Fe_56_54_D_DELTA_BOTTLE_bodzi6</p>
http://lod.bco-dmo.org/id/dataset-parameter/884931.rdf
Name: Flag_Fe_56_54_D_DELTA_BOTTLE_bodzi6
Units: unitless
Description: <p>Quality flag for Fe_56_54_D_DELTA_BOTTLE_bodzi6</p>
http://lod.bco-dmo.org/id/dataset-parameter/884932.rdf
Name: Cd_D_CONC_BOTTLE_igyghz
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Concentration of dissolved Cadmium (Cd) from bottle samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/884933.rdf
Name: SD1_Cd_D_CONC_BOTTLE_igyghz
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Error (1SD) of Cd_D_CONC_BOTTLE_igyghz</p>
http://lod.bco-dmo.org/id/dataset-parameter/884934.rdf
Name: Flag_Cd_D_CONC_BOTTLE_igyghz
Units: unitless
Description: <p>Quality flag for Cd_D_CONC_BOTTLE_igyghz</p>
http://lod.bco-dmo.org/id/dataset-parameter/884935.rdf
Name: Cd_114_110_D_DELTA_BOTTLE_ikpkep
Units: per mil
Description: <p>Atom ratio of dissolved Cd isotopes expressed in conventional delta notation (from bottle samples)</p>
http://lod.bco-dmo.org/id/dataset-parameter/884936.rdf
Name: SD2_Cd_114_110_D_DELTA_BOTTLE_ikpkep
Units: per mil
Description: <p>Error (2SD) of Cd_114_110_D_DELTA_BOTTLE_ikpkep</p>
http://lod.bco-dmo.org/id/dataset-parameter/884937.rdf
Name: Flag_Cd_114_110_D_DELTA_BOTTLE_ikpkep
Units: unitless
Description: <p>Quality flag for Cd_114_110_D_DELTA_BOTTLE_ikpkep</p>
http://lod.bco-dmo.org/id/dataset-parameter/884938.rdf
Name: Fe_D_CONC_BOTTLE_kroefs
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Concentration of dissolved Iron (Fe) from bottle samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/884939.rdf
Name: SD1_Fe_D_CONC_BOTTLE_kroefs
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Error (1SD) of Fe_D_CONC_BOTTLE_kroefs</p>
http://lod.bco-dmo.org/id/dataset-parameter/884940.rdf
Name: Flag_Fe_D_CONC_BOTTLE_kroefs
Units: unitless
Description: <p>Quality flag for Fe_D_CONC_BOTTLE_kroefs</p>
http://lod.bco-dmo.org/id/dataset-parameter/884941.rdf
Name: Cd_D_CONC_FISH_6fkamf
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Concentration of dissolved Cadmium (Cd) from GeoFish samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/884942.rdf
Name: SD1_Cd_D_CONC_FISH_6fkamf
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Error (1SD) of Cd_D_CONC_FISH_6fkamf</p>
http://lod.bco-dmo.org/id/dataset-parameter/884943.rdf
Name: Flag_Cd_D_CONC_FISH_6fkamf
Units: unitless
Description: <p>Quality flag for Cd_D_CONC_FISH_6fkamf</p>
http://lod.bco-dmo.org/id/dataset-parameter/884944.rdf
Name: Zn_66_64_D_DELTA_BOTTLE_mcjbhp
Units: per mil
Description: <p>Atom ratio of dissolved Zn isotopes expressed in conventional delta notation (from bottle samples)</p>
http://lod.bco-dmo.org/id/dataset-parameter/884945.rdf
Name: SD2_Zn_66_64_D_DELTA_BOTTLE_mcjbhp
Units: per mil
Description: <p>Error (2SD) of Zn_66_64_D_DELTA_BOTTLE_mcjbhp</p>
http://lod.bco-dmo.org/id/dataset-parameter/884946.rdf
Name: Flag_Zn_66_64_D_DELTA_BOTTLE_mcjbhp
Units: unitless
Description: <p>Quality flag for Zn_66_64_D_DELTA_BOTTLE_mcjbhp</p>
http://lod.bco-dmo.org/id/dataset-parameter/884947.rdf
Name: Fe_56_54_D_DELTA_FISH_65u814
Units: per mil
Description: <p>Atom ratio of dissolved Fe isotopes expressed in conventional delta notation (from GeoFish samples)</p>
http://lod.bco-dmo.org/id/dataset-parameter/884948.rdf
Name: SD2_Fe_56_54_D_DELTA_FISH_65u814
Units: per mil
Description: <p>Error (2SD) of Fe_56_54_D_DELTA_FISH_65u814</p>
http://lod.bco-dmo.org/id/dataset-parameter/884949.rdf
Name: Flag_Fe_56_54_D_DELTA_FISH_65u814
Units: unitless
Description: <p>Quality flag for Fe_56_54_D_DELTA_FISH_65u814</p>
http://lod.bco-dmo.org/id/dataset-parameter/884950.rdf
Name: Zn_D_CONC_BOTTLE_arrnao
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Concentration of dissolved Zinc (Zn) from bottle samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/884951.rdf
Name: SD1_Zn_D_CONC_BOTTLE_arrnao
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Error (1SD) of Zn_D_CONC_BOTTLE_arrnao</p>
http://lod.bco-dmo.org/id/dataset-parameter/884952.rdf
Name: Flag_Zn_D_CONC_BOTTLE_arrnao
Units: unitless
Description: <p>Quality flag for Zn_D_CONC_BOTTLE_arrnao</p>
http://lod.bco-dmo.org/id/dataset-parameter/884953.rdf
Name: Zn_66_64_D_DELTA_FISH_6o34bc
Units: per mil
Description: <p>Atom ratio of dissolved Zn isotopes expressed in conventional delta notation (from GeoFish samples)</p>
http://lod.bco-dmo.org/id/dataset-parameter/884954.rdf
Name: SD2_Zn_66_64_D_DELTA_FISH_6o34bc
Units: per mil
Description: <p>Error (2SD) of Zn_66_64_D_DELTA_FISH_6o34bc</p>
http://lod.bco-dmo.org/id/dataset-parameter/884955.rdf
Name: Flag_Zn_66_64_D_DELTA_FISH_6o34bc
Units: unitless
Description: <p>Quality flag for Zn_66_64_D_DELTA_FISH_6o34bc</p>
http://lod.bco-dmo.org/id/dataset-parameter/884956.rdf
Name: Zn_D_CONC_FISH_okrvqj
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Concentration of dissolved Zinc (Zn) from GeoFish samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/884957.rdf
Name: SD1_Zn_D_CONC_FISH_okrvqj
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Error (1SD) of Zn_D_CONC_FISH_okrvqj</p>
http://lod.bco-dmo.org/id/dataset-parameter/884958.rdf
Name: Flag_Zn_D_CONC_FISH_okrvqj
Units: unitless
Description: <p>Quality flag for Zn_D_CONC_FISH_okrvqj</p>
http://lod.bco-dmo.org/id/dataset-parameter/884959.rdf
Name: Cd_114_110_D_DELTA_FISH_rqkhol
Units: per mil
Description: <p>Atom ratio of dissolved Cd isotopes expressed in conventional delta notation (from GeoFish samples)</p>
http://lod.bco-dmo.org/id/dataset-parameter/884960.rdf
Name: SD2_Cd_114_110_D_DELTA_FISH_rqkhol
Units: per mil
Description: <p>Error (2SD) of Cd_114_110_D_DELTA_FISH_rqkhol</p>
http://lod.bco-dmo.org/id/dataset-parameter/884961.rdf
Name: Flag_Cd_114_110_D_DELTA_FISH_rqkhol
Units: unitless
Description: <p>Quality flag for Cd_114_110_D_DELTA_FISH_rqkhol</p>
http://lod.bco-dmo.org/id/dataset-parameter/884962.rdf
Name: Fe_D_CONC_FISH_yau1bo
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Concentration of dissolved Iron (Fe) from GeoFish samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/884963.rdf
Name: SD1_Fe_D_CONC_FISH_yau1bo
Units: nanomoles per kilogram (nmol/kg)
Description: <p>Error (1SD) of Fe_D_CONC_FISH_yau1bo</p>
http://lod.bco-dmo.org/id/dataset-parameter/884964.rdf
Name: Flag_Fe_D_CONC_FISH_yau1bo
Units: unitless
Description: <p>Quality flag for Fe_D_CONC_FISH_yau1bo</p>
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
516716
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/69c7a553-1f44-5151-9216-bc8e951f8a43/content
download
https://doi.org/10.26008/1912/bco-dmo.884673.1
download
onLine
dataset
<p>Seawater samples were collected using the GEOTRACES trace-metal clean sampling system (rosette with 24 12-liter GO-FLO bottles) or a towfish for surface samples (Cutter and Bruland, 2012). Samples were filtered through acid-cleaned AcroPak capsule filters (0.2 micrometers (μm)) into acid-cleaned LDPE bottles. For concentration and isotope analysis at the University of South Florida (USF), 2 liters of filtered seawater were collected, acidified ashore at USF by addition of 2.4 milliliters (mL) 10 molar (M) Teflon-distilled HCl, and stored for at least 12 months at pH ∼2 before processing.</p>
<p>Seawater samples were processed for isotope analysis following Sieber et al. (2019). Briefly, a double-spike for cadmium (Cd), iron (Fe), and zinc (Zn) was added prior to batch extraction using Nobias PA-1 chelating resin, followed by purification by anion-exchange chromatography using AG-MP1 resin. Isotope analyses were performed on a Thermo Neptune Plus MC-ICPMS in the Tampa Bay Plasma Facility at the University of South Florida using an Apex-Q (Cd) or Apex Ω (Fe, Zn) introduction system.</p>
<p>We express Cd stable isotope ratios in delta notation (δ<sup>114</sup>Cd) relative to the NIST SRM-3108 Cd standard. A secondary standard, BAM-I012, was analyzed over 8 sessions on the same timescale as the samples to provide an estimate of long-term instrumental precision. We obtain a value of −1.32 ± 0.06‰ (2SD, n = 172), in agreement with consensus values (Abouchami et al., 2013). Using the 2SD of offsets from the mean of full replicate measurements based on 26 pairs of replicate analysis on separate seawater samples collected at the same depth (the GP15 sampling strategy collected overlapping samples between casts), we obtain a second estimate of external precision (0.05‰), which is similar to analytical precision. Therefore, we consider a 2SD uncertainty of 0.06‰ as a conservative estimate of analytical precision, and have applied it to all samples, except for low-concentration samples where the larger internal error is considered a more conservative estimate of uncertainty. Concentrations were calculated using the isotope dilution technique based on on-peak blank, interference and mass-bias corrected <sup>114</sup>Cd/<sup>111</sup>Cd ratios measured simultaneously with isotope analyses (Sieber et al., 2019). We express uncertainty (1SD) on Cd concentrations as 2%, based on replicate analysis on separate seawater samples collected at the same depth (n = 26).</p>
<p>We express Fe stable isotope ratios in delta notation (δ<sup>56</sup>Fe) relative to the IRMM-014 standard. A secondary Fe standard, NIST-3126, was analyzed over 44 sessions to provide an estimate of long-term instrumental precision. We obtain a value of +0.36 ± 0.05‰ (2SD, n = 604), in agreement with consensus values (Conway et al., 2013). As a second estimate of external precision, we use the 2SD of offsets from the mean of full replicate measurements based on 26 pairs of replicate analysis using separate seawater samples collected at the same depth (0.08‰), which is similar to the analytical precision. Therefore, we consider a 2SD uncertainty of 0.05‰ as an estimate of analytical precision, and have applied it to all samples, except for low-concentration samples where the larger internal error is considered a more conservative estimate of uncertainty. Concentrations were calculated using the isotope dilution technique based on on-peak blank, interference and mass-bias corrected <sup>57</sup>Fe/<sup>56</sup>Fe ratios measured simultaneously with isotope analysis. We express uncertainty (1SD) on Fe concentrations as 2%, based on replicate analysis on separate seawater samples collected at the same depth (n = 26).</p>
<p>We express Zn stable isotope ratios in delta notation (δ<sup>66</sup>Zn) relative to the JMC-Lyon standard. A secondary Zn standard, AA-ETH, was analyzed on the same timescale as the samples (over 10 sessions) to provide an estimate of long-term instrumental precision. We obtain a value of +0.28 ± 0.03‰ (2SD, n = 147), in agreement with consensus values (Archer et al., 2017). As a second estimate of external precision, we use the 2SD of offsets from the mean of full replicate measurements based on 26 pairs of replicate analysis using separate seawater samples collected at the same depth (0.03‰), which is similar to the analytical precision. Therefore, we consider a 2SD uncertainty of 0.03‰ as an estimate of analytical precision, and have applied it to all samples, except for low-concentration samples where the larger internal error is considered a more conservative estimate of uncertainty. Concentrations were calculated using the isotope dilution technique based on on-peak blank, interference and mass-bias corrected <sup>67</sup>Zn/<sup>66</sup>Zn ratios measured simultaneously with isotope analysis. We express uncertainty (1SD) on Zn concentrations as 5%, based on replicate analysis on separate seawater samples collected at the same depth (n = 26).</p>
Specified by the Principal Investigator(s)
<p><strong>Data Processing:</strong><br />
Microsoft Excel was used for managing data.</p>
<p>Concentrations are calculated using isotope dilution. Data reduction of isotope data is based on the iterative approach of Siebert et al. (2001).</p>
<p>Data are assigned quality flags according to GEOTRACES Flag Policy&nbsp; (<a href="https://www.geotraces.org/geotraces-quality-flag-policy/" target="_blank">https://www.geotraces.org/geotraces-quality-flag-policy/</a>); obvious outliers are marked as 4, missing data as 9, and&nbsp;good data as 2.</p>
<p><strong>BCO-DMO Processing:</strong><br />
- moved data for station 18.6 from RR1814 to RR1815;<br />
- changed incorrect years of 2013 and 2016 to 2018;<br />
- for station 18.6, changed end date from 2018-10-21 to 2018-10-25;<br />
- renamed fields to comply with BCO-DMO naming conventions;<br />
- added start and end date-time columns in ISO 8601 format.</p>
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
towfish
towfish
PI Supplied Instrument Name: towfish PI Supplied Instrument Description:A towfish was used to collect surface samples. Instrument Name: GeoFish Towed near-Surface Sampler Instrument Short Name:GeoFish Instrument Description: The GeoFish towed sampler is a custom designed near surface (2 meters or less) sampling system for the collection of trace metal clean seawater. It consists of a PVC encapsulated lead weighted torpedo and separate PVC depressor vane supporting the intake utilizing all PFA Teflon tubing connected to a deck mounted, air-driven, PFA Teflon dual-diaphragm pump which provides trace-metal clean seawater at up to 3.7L/min. The GeoFish is towed at up to 13kts off to the side of the vessel outside of the ship's wake to avoid possible contamination from the ship's hull. It was developed by Geoffrey Smith and Ken Bruland (University of California, Santa Cruz). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/31/
Trace-metal clean sampling system
Trace-metal clean sampling system
PI Supplied Instrument Name: Trace-metal clean sampling system PI Supplied Instrument Description:A Trace-metal clean sampling system (rosette with 24 12 liter GO-FLO bottles) was used for seawater sample collection. Instrument Name: GO-FLO Teflon Trace Metal Bottle Instrument Short Name:GO-FLO Teflon TM Instrument Description: GO-FLO Teflon-lined Trace Metal free sampling bottles are used for collecting water samples for trace metal, nutrient and pigment analysis. The GO-FLO sampling bottle is designed specifically to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/30/
Thermo Neptune Plus MC-ICPMS
Thermo Neptune Plus MC-ICPMS
PI Supplied Instrument Name: Thermo Neptune Plus MC-ICPMS PI Supplied Instrument Description:A Thermo Neptune Plus MC-ICPMS was used for concentration and isotope analyses. Instrument Name: Multi Collector Inductively Coupled Plasma Mass Spectrometer Instrument Short Name:MC-ICPMS Instrument Description: A Multi Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS) is a type of mass spectrometry where the sample is ionized in a plasma (a partially ionized gas, such as Argon, containing free electrons) that has been generated by electromagnetic induction. A series of collectors is used to detect several ion beams simultaneously.
A MC-ICPMS is a hybrid mass spectrometer that combines the advantages of an inductively coupled plasma source and the precise measurements of a magnetic sector multicollector mass spectrometer. The primary advantage of the MC-ICPMS is its ability to analyze a broader range of elements, including those with high ionization potential that are difficult to analyze by Thermal Ionization Mass Spectrometry (TIMS). The ICP source also allows flexibility in how samples are introduced to the mass spectrometer and allows the analysis of samples introduced either as an aspirated solution or as an aerosol produced by laser ablation.
Cruise: RR1815
RR1815
R/V Roger Revelle
Community Standard Description
International Council for the Exploration of the Sea
R/V Roger Revelle
vessel
RR1815
Gregory A. Cutter
Old Dominion University
https://datadocs.bco-dmo.org/docs/geotraces/GEOTRACES_PMT/casciotti/data_docs/GP15_Cruise_Report_with_ODF_Report.pdf
Report describing RR1815
R/V Roger Revelle
Community Standard Description
International Council for the Exploration of the Sea
R/V Roger Revelle
vessel