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Sample collection and processing:<\/strong> Dissolved iron (DFe) analysis:<\/strong> Intercalibration information:<\/strong> Related references:<\/strong> Measures, C. I., J. Yuan, and J. A. Resing (1995), Determination of iron in seawater by flow injection analysis using in-line preconcentration and spectrophotometric detection. Marine Chemistry, 50, 3-12.<\/p>\n Sedwick, P. N., B. M. Sohst, S. J. Ussher, and A. R. Bowie, A. R. (2015), A zonal picture of the water column distribution of dissolved iron(II) during the US GEOTRACES North Atlantic transect cruise (GEOTRACES GA03). Deep Sea Research Part II: Topical Studies in Oceanography, 116, 166-175.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Water-column dissolved iron (Fe) concentrations for major stations occupied during U.S. GEOTRACES EPZT cruise; post-cruise analyses conducted at Old Dominion University","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":" Water-column dissolved iron concentrations for major stations occupied during U.S. GEOTRACES Eastern Pacific Zonal Transect cruise (GEOTRACES cruise GP16).<\/p>\n Note<\/strong>: These data are from post-cruise analyses conducted at Old Dominion University and supersede preliminary shipboard data \"FE_DISS\" in BCO-DMO file \"CTD \u2013 GT-C Bottle\"<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"GP16 Dissolved Iron - ODU","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":" Data Processing:<\/strong> BCO-DMO Processing:<\/strong> Additional GEOTRACES Processing:<\/strong> cruise_id, EXPOCODE,SECT_ID, STNNBR, CASTNO, GEOTRC_EVENTNO, GEOTRC_SAMPNO, GEOTRC_INSTR, SAMPNO, GF_NO, BTLNBR, BTLNBR_FLAG_W, DATE_START_EVENT, TIME_START_EVENT, ISO_DATETIME_UTC_START_EVENT, EVENT_LAT, EVENT_LON, DEPTH_MIN, DEPTH_MAX, \u00a0BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.<\/p>\n This added information will facilitate subsequent analysis and inter comparison of the datasets.<\/p>\n Bottle parameters in the master file were taken from the GT-C_Bottle and ODF_Bottle datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the TN303 Event Log (version 30 Oct 2014). Where applicable, pump information was taken from the PUMP_Nuts_Sals dataset.<\/p>\n 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>\n 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>\n 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>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"670285","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"GP16 Dissolved Iron - ODU"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2016-12-14T12:09:44-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2016-12-14T12:09:44-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2023-07-07T16:10:26-04:00","@type":"xsd:dateTime"}],"http:\/\/rdfs.org\/ns\/void#inDataset":[{"@id":"http:\/\/www.bco-dmo.org\/"}],"http:\/\/ocean-data.org\/schema\/namedGraph":[{"@value":"urn:bcodmo:dataset:670285","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/670285"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier670285"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"Water-column dissolved iron (Fe) concentrations for major stations occupied during U.S. GEOTRACES EPZT cruise (R\/V Thomas G. 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\nWater-column samples for trace metal analysis were collected in modified 12 L Teflon-lined GO-FLO samplers (General Oceanics Inc.), deployed on the U.S. GEOTRACES clean CTD rosette system with a total of 24 samplers. All samples were filtered as soon as possible after recovery by GEOTRACES sampling personnel using a 0.2 um Supor Acropak filter cartridge (Pall Corp.) inside the U.S. GEOTRACES clean-air laboratory van. Near-surface samples (~3 m depth) were collected whilst underway near each station using the Bruland-Smith \"Geofish\" sampling system towed outside of the ship\u2019s wake; seawater from the Geofish was pumped into a clean-air laboratory van, where it was filtered through 0.2 um Supor Acropak filter cartridges.<\/p>\n
\nThe filtered seawater samples were collected in 125 mL acid-cleaned Nalgene wide-mouth low-density polyethylene bottles, acidified at-sea to pH ~1.8 with Fisher Optima grade ultrapure hydrochloric acid, and then stored at room temperature until post-cruise analysis by Bettina Sohst at Old Dominion University.\u00a0Dissolved iron was determined by flow injection analysis (FIA) with colorimetric detection after in-line preconcentration on resin-immobilized 8-hydroxyquinoline (Sedwick et al., 2015), using a method modified from Measures et al. (1995). Analyses were performed on a volumetric basis, so concentrations are reported in units of nanomole liter-1 (nM), which may be converted to units of nmol kg-1 by assuming a mean solution density of 1.023 kg L-1 at laboratory temperature. Analytical precision is estimated from multiple (separate-day) determinations of the SAFe seawater reference materials, which yield uncertainties (expressed as one relative standard deviation on the mean, or one sigma) of ~15% at the concentration level of SAFe S seawater (0.090 nM), and ~10% at the concentration level of SAFe D2 seawater (0.90 nM). The analytical limit of detection is estimated as the DFe concentration equivalent to a peak area that is three times the standard deviation on the \"zero-loading blank\" (or \"manifold blank\"), which yield a detection limit below 0.04 nM (Bowie et al., 2004). Blank contributions from the ammonium acetate sample buffer solution (added on-line during analysis) and hydrochloric acid (added after collection) are typically negligible (i.e., too low to quantify).<\/p>\n
\nA preliminary intercomparison of DFe data from the U.S. GEOTRACES EPZT cruise carried out as part of a cruise data workshop in November 2015 indicated that our shipboard DFe analyses were in some cases as much as 10-20% higher than corresponding post-cruise determinations by the other analysts, which is an issue that has been previously noted for shipboard versus post-cruise DFe measurements using FIA. Consequently, we undertook a re-analysis of all cruise samples at Old Dominion University, which yielded mostly lower values that agree more closely with the other EPZT DFe data sets.\u00a0A subsequent intercalibration of EPZT DFe data for samples collected from stations 1, 11, 17, 18, 26 and 36 has been carried out by PIs Ken Bruland, Seth John, Peter Sedwick and Jingfeng Wu. At this writing (November 2016), the results of this intercalibration exercise are being evaluated by the International GEOTRACES Standards and Intercalbration Committee.\u00a0<\/p>\n
\nBowie, A. R., P. N. Sedwick, and P. J. Worsfold (2004), Analytical intercomparison between flow injection-chemiluminescence and flow injection-spectrophotometry for the determination of picomolar concentrations of iron in seawater, Limnology & Oceanography Methods, 2, 42-54.<\/p>\n
\nFollowing subtraction of zero-loading blank values, sample concentrations were calculated using least-squares linear regressions fit to daily calibration curves obtained by additions of iron standard solutions to low-iron seawater.<\/p>\n
\n- modified parameter names to conform with BCO-DMO and GEOTRACES naming conventions;
\n- joined to BCO-DMO EPZT master events\u00a0file;
\n- separated TEI data into different columns for BOTTLE and FISH samples, in accordance with GEOTRACES naming conventions;
\n- 19 December 2016: made corrections to PI-provided depths per conversation with PI.<\/p>\n
\nAs was done for the GEOTRACES-NAT data, 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:<\/p>\n