http://lod.bco-dmo.org/id/dataset/637784
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
2016-02-03
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Dissolved Fe stable isotope ratios and concentrations collected from the RRS Discovery (D357) and RRS James Cook (JC068) from the North Atlantic in 2010-2011
2016-11-30
publication
2016-11-30
revision
BCO-DMO Linked Data URI
2016-11-30
creation
http://lod.bco-dmo.org/id/dataset/637784
Seth G. John
University of South Carolina
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: John, S. G. (2016) Dissolved Fe stable isotope ratios and concentrations collected from the RRS Discovery (D357) and RRS James Cook (JC068) from the North Atlantic in 2010-2011. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2016-11-30 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/637784 [access date]
Dissolved (0.2 micron filtered (<75 m depth) or 0.4 micron (>75 m depth) Fe stable isotope ratios and concentrations Dataset Description: Methods and Sampling: <p>Samples were provided from the UK GEOTRACES Titanium sampling rosette and were sampled and filtered into acid-cleaned 1L LDPE bottles by the onboard clean sampling team. water samples were filtered using Millipore 25 mm 0.4 μm polyethersulfone (PES) filters (&gt;75 m depth) or 0.2 μm AcroPak Supor Pall PES capsules (&lt;75 m depth or fish samples). Upon receipt of samples on shore, they were acidified to pH 2 using clean hydrochloric acid and left at this pH for at least 3 months before processing. Every sample was simultaneously extracted and purified for the analysis of d<sup>56</sup>Fe and [Fe] using published methods (Conway <em>et al</em>., 2013). Briefly, Fe, double-spike was added to the acidified samples and allowed to equilibrate for &gt; 1 hour. Metals were then extracted from seawater onto an ethylenediaminetriacetic acid resin (Nobias PA-1; Hitachi) for 2 hours at pH 2. Metals were eluted off this resin using 3 N HNO<sub>3</sub>, and were then purified by anion exchange chromatography before being reconstituted in 0.1 N HNO<sub>3</sub> for analysis.</p>
<p>Concentrations and stable isotope ratios were determined simultaneously by analysis on a Neptune multi-collector ICP-MS in high resolution mode. Every sample was analyzed twice, and the mean isotope ratios are presented here, expressed relative to the international isotope standard IRRM-014. Instrumental and procedural isotopic fractionation was corrected for using a double-spike data reduction scheme.</p>
<p>Concentrations were calculated using isotope-dilution to calculate ng of metal per sample, and then converted to nmol kg<sup>-1</sup> or pmol kg<sup>-1</sup> using the weight of each sample processed. Concentration numbers represent the mean of two ICP-MS analyses of each sample. The largest sources of error for concentration analyses are determining the weight of the sample and determining the volume of double-spike added to each sample. We approximate 2% error for each sample based on the combination of these two factors. Accuracy of this technique for concentrations were checked by analysis of S, D1 and D2 SAFe reference standards (for which we determined values identical to the consensus values; see Conway et al, 2013) and inter-comparison with two other groups measuring trace metal concentrations on US GEOTRACES GA03 samples (Middag <em>et al</em>., 2015).</p>
<p>Uncertainty for isotope ratios in the dataset is expressed as the 2 sigma uncertainty on the average isotope ratio, calculated from a combination of the internal standard error of each of two measurements and the bracketing isotope standards used, as described in Conway <em>et al</em>., (2013). &nbsp;We also estimate external precision for these samples (0.05‰), based on replicate analyses of S. Atlantic seawater samples (see Conway, John and Lacan, in review).</p>
<p><strong>References:</strong></p>
<p>Conway, T. M., John, S. G. and Lacan, F. (2016). Intercomparison of dissolved iron isotope profiles from reoccupation of three GEOTRACES stations in the Atlantic Ocean. Marine Chemistry. 183. 50-61. doi:10.1016/j.marchem.2016.04.007.</p>
<p>Conway, T.M., Rosenberg, A.D., Adkins, J.F., and S.G. John. (2013). A new method for precise determination of iron, zinc and cadmium stable isotope ratios in seawater by double-spike mass spectrometry.&nbsp; Analytica Chimica Acta, 793: 44-52.</p>
<p>Middag, R., Sefarian, R., Conway, T. M., John, S. G., Bruland, K. W. and de Baar, H. J. W. (2015). GEOTRACES Intercomparison of Dissolved Trace Elements at the Bermuda Atlantic Time Series Station. <em>Mar. Chem.</em> 177 (3). 476-479.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1131387 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1131387
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-0929491 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=0929491
completed
Seth G. John
University of South Carolina
213-740-0696
USC ZHS 117 2651 Trousdale Pkwy.
Los Angeles
CA
90089
USA
sethjohn@usc.edu
pointOfContact
asNeeded
Dataset Version: 2
Unknown
cruise_id
station
depth
inst
cast_CTD
cast
bottle
sample_GEOTRC
lat_start
lon_start
date
time
Fe
Fe_err
delta_56Fe
Fe_err_2s
flags
theme
None, User defined
Cruise identfier
station
depth
instrument
cast
bottle
sample identification
latitude at start time of measurement
longitude at start time of measurement
date
time of day
Iron
Fe_err
Fe 54 to Fe 56 ratio
standard error
flag
featureType
BCO-DMO Standard Parameters
GeoFish Towed near-Surface Sampler
Mass Spectrometer
Trace Metal Bottle
instrument
BCO-DMO Standard Instruments
D357
JC068
service
Deployment Activity
Atlantic-40 South
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.
Trace-metal isotopes in Atlantic seawater and particles from Geotraces transects A03 and A10
https://osprey.bco-dmo.org/project/637785
Trace-metal isotopes in Atlantic seawater and particles from Geotraces transects A03 and A10
<p>Trace metals significantly affect marine biogeochemistry and can be important tools of discovery, leading to information on nutrient supply and demineralization, ocean circulation, and earth?s climate history. Due to their importance, the international GEOTRACES effort was designed to measure the distribution of metals in the oceans. However, metal concentration distributions are only a part of the larger picture. To provide a more complete dataset, researchers from the University of South Carolina propose to measure trace metal isotopes (Fe, Cd, Cu, and Zn) and plan to apply these data to distinguish between the latest competing hypotheses of factors influencing metal biogeochemcial cycling. Many processes can fractionate the isotopes of elements and therefore differences in the isotope signal can be instructive of biogeochemical cycling of these elements. The goal of the project is to address the origin and amount of biologically available iron, its modification during internal cycling, its transfer between pools, and the factors that influence its bioavailability. In addition, Zn and Cd isotope analyses will yield information on modern and ancient oceans, which could help predict how oceans change in future climates. the isotopes of cu will also be examined. Results will inform the ocean science community, and elucidate how trace-metals and other nutrients affect production and are impacted by climate change.</p>
TMI_GEOTRACES-UK
largerWorkCitation
project
eng; USA
oceans
Atlantic-40 South
2016-11-30
South Atlantic Ocean
0
BCO-DMO catalogue of parameters from Dissolved Fe stable isotope ratios and concentrations collected from the RRS Discovery (D357) and RRS James Cook (JC068) from the North Atlantic in 2010-2011
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/638058.rdf
Name: cruise_id
Units: unitless
Description: <p>cruise identification: D=RRS/Discovery; JC=RRS/James Cook</p>
http://lod.bco-dmo.org/id/dataset-parameter/638059.rdf
Name: station
Units: unitless
Description: <p>station identification</p>
http://lod.bco-dmo.org/id/dataset-parameter/638060.rdf
Name: depth
Units: meters
Description: <p>depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/638061.rdf
Name: inst
Units: unitless
Description: <p>instrument: surface towed fish or titanium rosette</p>
http://lod.bco-dmo.org/id/dataset-parameter/638062.rdf
Name: cast_CTD
Units: unitless
Description: <p>CTD cast identification</p>
http://lod.bco-dmo.org/id/dataset-parameter/638063.rdf
Name: cast
Units: unitless
Description: <p>CTD cast number</p>
http://lod.bco-dmo.org/id/dataset-parameter/638064.rdf
Name: bottle
Units: unitless
Description: <p>bottle number</p>
http://lod.bco-dmo.org/id/dataset-parameter/638065.rdf
Name: sample_GEOTRC
Units: unitless
Description: <p>GEOTRACES sample number</p>
http://lod.bco-dmo.org/id/dataset-parameter/638066.rdf
Name: lat_start
Units: decimal degrees
Description: <p>starting latitude; north is positive</p>
http://lod.bco-dmo.org/id/dataset-parameter/638067.rdf
Name: lon_start
Units: decimal degrees
Description: <p>starting longitude; east is positive</p>
http://lod.bco-dmo.org/id/dataset-parameter/638068.rdf
Name: date
Units: yyyy-mm-dd
Description: <p>UTC date</p>
http://lod.bco-dmo.org/id/dataset-parameter/638069.rdf
Name: time
Units: HH:MM
Description: <p>UTC time</p>
http://lod.bco-dmo.org/id/dataset-parameter/638070.rdf
Name: Fe
Units: nmol kg-1
Description: <p>Fe concentration (< 2 micron)</p>
http://lod.bco-dmo.org/id/dataset-parameter/638071.rdf
Name: Fe_err
Units: nmol kg-1
Description: <p>Fe error; 2% of concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/638072.rdf
Name: delta_56Fe
Units: o/oo
Description: <p>Fe stable isotope ratio: ((56Fe/54Fe)sample/(56Fe/54Fe)IRMM-014^-1)*1000</p>
http://lod.bco-dmo.org/id/dataset-parameter/638073.rdf
Name: Fe_err_2s
Units: o/oo
Description: <p>2 sigma uncertainty on the dissolved d56Fe</p>
http://lod.bco-dmo.org/id/dataset-parameter/638074.rdf
Name: flags
Units: unitless
Description: <p>Data quality flag: 1 (good) or 2 (questionable) and comments</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
21694
https://datadocs.bco-dmo.org/file/P66Gw27IPyMDq/Fe_diss_UK_GA10.csv
Fe_diss_UK_GA10.csv
Primary data file for dataset ID 637784
download
https://osprey.bco-dmo.org/dataset/637784/data/download
download
onLine
dataset
<p>Samples were provided from the UK GEOTRACES Titanium sampling rosette and were sampled and filtered into acid-cleaned 1L LDPE bottles by the onboard clean sampling team. water samples were filtered using Millipore 25 mm 0.4 μm polyethersulfone (PES) filters (&gt;75 m depth) or 0.2 μm AcroPak Supor Pall PES capsules (&lt;75 m depth or fish samples). Upon receipt of samples on shore, they were acidified to pH 2 using clean hydrochloric acid and left at this pH for at least 3 months before processing. Every sample was simultaneously extracted and purified for the analysis of d<sup>56</sup>Fe and [Fe] using published methods (Conway <em>et al</em>., 2013). Briefly, Fe, double-spike was added to the acidified samples and allowed to equilibrate for &gt; 1 hour. Metals were then extracted from seawater onto an ethylenediaminetriacetic acid resin (Nobias PA-1; Hitachi) for 2 hours at pH 2. Metals were eluted off this resin using 3 N HNO<sub>3</sub>, and were then purified by anion exchange chromatography before being reconstituted in 0.1 N HNO<sub>3</sub> for analysis.</p>
<p>Concentrations and stable isotope ratios were determined simultaneously by analysis on a Neptune multi-collector ICP-MS in high resolution mode. Every sample was analyzed twice, and the mean isotope ratios are presented here, expressed relative to the international isotope standard IRRM-014. Instrumental and procedural isotopic fractionation was corrected for using a double-spike data reduction scheme.</p>
<p>Concentrations were calculated using isotope-dilution to calculate ng of metal per sample, and then converted to nmol kg<sup>-1</sup> or pmol kg<sup>-1</sup> using the weight of each sample processed. Concentration numbers represent the mean of two ICP-MS analyses of each sample. The largest sources of error for concentration analyses are determining the weight of the sample and determining the volume of double-spike added to each sample. We approximate 2% error for each sample based on the combination of these two factors. Accuracy of this technique for concentrations were checked by analysis of S, D1 and D2 SAFe reference standards (for which we determined values identical to the consensus values; see Conway et al, 2013) and inter-comparison with two other groups measuring trace metal concentrations on US GEOTRACES GA03 samples (Middag <em>et al</em>., 2015).</p>
<p>Uncertainty for isotope ratios in the dataset is expressed as the 2 sigma uncertainty on the average isotope ratio, calculated from a combination of the internal standard error of each of two measurements and the bracketing isotope standards used, as described in Conway <em>et al</em>., (2013). &nbsp;We also estimate external precision for these samples (0.05‰), based on replicate analyses of S. Atlantic seawater samples (see Conway, John and Lacan, in review).</p>
<p><strong>References:</strong></p>
<p>Conway, T. M., John, S. G. and Lacan, F. (2016). Intercomparison of dissolved iron isotope profiles from reoccupation of three GEOTRACES stations in the Atlantic Ocean. Marine Chemistry. 183. 50-61. doi:10.1016/j.marchem.2016.04.007.</p>
<p>Conway, T.M., Rosenberg, A.D., Adkins, J.F., and S.G. John. (2013). A new method for precise determination of iron, zinc and cadmium stable isotope ratios in seawater by double-spike mass spectrometry.&nbsp; Analytica Chimica Acta, 793: 44-52.</p>
<p>Middag, R., Sefarian, R., Conway, T. M., John, S. G., Bruland, K. W. and de Baar, H. J. W. (2015). GEOTRACES Intercomparison of Dissolved Trace Elements at the Bermuda Atlantic Time Series Station. <em>Mar. Chem.</em> 177 (3). 476-479.</p>
Specified by the Principal Investigator(s)
<p>Data are flagged as 1 (good) or 2 (questionable). Data points flagged as questionable are considered to be potential outliers. This is because the bottle tripped at the wrong depth or data appear oceanographically inconsistent (e.g. values which are very different from samples taken above and below or from the GA02 section at Station 18), even though there is no obvious analytical reason to dismiss them.</p>
<p>BCO-DMO Processing Notes:</p>
<p>2016-04-15: Changed parameter description for&nbsp;d56Fe_mean from&nbsp;54Fe/56Fe to 56Fe/54Fe. . Also slightly changed the Fe_err_2s description from "2 sigma uncertainty in dissolved Fe" to "2sigma error on the d56Fe parameter".</p>
<p>2016-11-28: Changed parameter name of d56Fe_mean to delta_56Fe, to match the GT10/11 (GA03) dataset. Changed metadata version from 2016-04-15 to 2016-11-28. Data made publicly accessible.</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
PI Supplied Instrument Name: 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/
PI Supplied Instrument Name: PI Supplied Instrument Description:Neptune multi-collector ICP-MS Instrument Name: Mass Spectrometer Instrument Short Name:Mass Spec Instrument Description: General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/
PI Supplied Instrument Name: PI Supplied Instrument Description:1L LDPE bottles Instrument Name: Trace Metal Bottle Instrument Short Name:TM Bottle Instrument Description: Trace metal (TM) clean rosette bottle used for collecting trace metal clean seawater samples. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/30/
Cruise: D357
D357
Community Standard Description
International Council for the Exploration of the Sea
RRS Discovery
vessel
D357
Gideon Henderson
University of Oxford
http://dmoserv3.bco-dmo.org/data_docs/GEOTRACES/UK_GT/D357_cruise_report.pdf
Report describing D357
Cruise: JC068
JC068
RRS James Cook
Community Standard Description
International Council for the Exploration of the Sea
RRS James Cook
vessel
JC068
Gideon Henderson
University of Oxford
http://dmoserv3.bco-dmo.org/data_docs/GEOTRACES/UK_GT/JC068_cruise_report.pdf
Report describing JC068
Community Standard Description
International Council for the Exploration of the Sea
RRS Discovery
vessel
RRS James Cook
Community Standard Description
International Council for the Exploration of the Sea
RRS James Cook
vessel