<div><p>Note: Methodology for this dataset is the same as that used in the <a href="https://www.bco-dmo.org/dataset/669178" target="_blank">GEOTRACES EPZT particles data</a> from Seth John.</p>
<p>A subsample (0.8 - 51 um-sized) of a total digestion of the suspended particles was provided by P. Lam for the analysis of total particle δ56Fe. Samples were purified by anion exchange chromatography and analyzed by multi-collector ICPMS.</p>
<p>The "labile" phase of the suspended particles was determined by leaching with a pH 8 solution containing 0.1 M oxalic acid and 0.05 M EDTA for 2 hours at 90 degrees C. Method is described in Revels et al (2015). Labile δ56Fe was determined according to the same procedures as total δ56Fe. Concentrations of Fe, Cd, Ba, and P in the labile phase were determined by analysis of the leachate on an Element single-collector ICP-MS.</p>
<p><strong>References:</strong><br />
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:10.1016/j.dsr2.2014.12.004</p></div>
Particulate Fe isotopes (d56Fe, labile d56Fe, labile[Fe], [Cd], [Ba], and [P]) from GT10 and GT11 cruises.
<div><p>Particulate iron (Fe) isotope data, including suspended particulate total δ56Fe, labile δ56Fe, labile [Fe], [Cd], [Ba], and [P], from the 2010 and 2011 U.S. GEOTRACES North Atlantic Transect cruises (GT10 and GT11).</p></div>
GT10-11 - Particulate Fe Isotopes
<div><p><strong>Data Processing:</strong><br />
All concentration data has been corrected for "dipped filter" 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 "BDL".</p>
<p>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)).</p>
<p><strong>Data Quality Flags:</strong><br />
1 = good data;<br />
0 = no data.</p>
<p><strong>BCO-DMO Processing Notes:</strong><br />
Separated original "Station" column into cruise_id, cruise_name, and station_GEOTRC; added lon column from the original lon_360 column; replaced missing data with "nd" to indicate "no data"; modified parameter names to conform with BCO-DMO naming conventions.</p>
<p><strong>Additional GEOTRACES Processing:</strong><br />
After the data were submitted to the International Data Management Office, BODC, the office noticed that important identifying information was missing in many datasets. With the agreement of BODC and the US GEOTRACES lead PIs, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters: station_GEOTRC, cast_GEOTRC (bottle and pump data only), event_GEOTRC, sample_GEOTRC, sample_bottle_GEOTRC (bottle data only), bottle_GEOTRC (bottle data only), depth_GEOTRC_CTD (bottle data only), depth_GEOTRC_CTD_rounded (bottle data only), BTL_ISO_DateTime_UTC (bottle data only), and GeoFish_id (GeoFish data only). This added information will facilitate subsequent analysis and inter comparison of the datasets.</p>
<p>Bottle parameters in the master file were taken from the GT-C_Bottle_GT10, GT-C_Bottle_GT11, ODF_Bottle_GT10, and ODF_Bottle_GT11 datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the Event_Log_GT10 and Event_Log_GT11 datasets. McLane pump cast numbers missing in event logs were taken from the Particulate Th-234 dataset submitted by Ken Buesseler.</p>
<p>A standardized BCO-DMO method (called "join") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.</p>
<p>If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.</p>
<p>See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.</p></div>
4074
GT10-11 - Particulate Fe Isotopes
2013-11-06T12:25:42-05:00
2013-11-06T12:25:42-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:4074
Particulate Fe isotopes (d56Fe, labile d56Fe, labile[Fe], [Cd], [Ba], and [P]) from R/V Knorr cruises KN199-04, KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)
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John, S. G. (2013) Particulate Fe isotopes (d56Fe, labile d56Fe, labile[Fe], [Cd], [Ba], and [P]) from R/V Knorr cruises KN199-04, KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 08 Nov 2013) Version Date 2013-11-08 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/4074 [access date]
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08 Nov 2013
false
2013-11-08
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