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Water-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). At each station, the bottles were deployed open and tripped on ascent at 3 m\/min. On deck, the bottles were kept in a trace metal clean sampling van over-pressurized with HEPA-filtered air, except immediately prior to and following deployments, in which cases they were covered on both ends with shower caps to avoid deck contamination. All samples were filtered as soon as possible after recovery by GEOTRACES sampling personnel using 0.2 um Supor Acropak filter cartridge (Pall Corp.) inside the U.S. GEOTRACES clean-air laboratory van.\u00a0Near-surface samples (from ~2 m depth) were collected while underway on approach to or departure from each station using the Bruland-Smith \"Geofish\"\u00a0sampling system, which was towed outside of the ship\u2019s wake.\u00a0Seawater from the Geofish was pumped into a clean-air laboratory van, where it was filtered through 0.2 um Supor Acropak filter cartridges. After sample collection, the exteriors of the bottles were rinsed once with De-ionized water and dried under a laminar flow hood. Samples were acidified within 24 hours with 0.2 mLs of 6N to a pH of ~1.8. Samples were analyzed at sea within 1 month of collection.<\/p>\n
Dissolved Mn was determined at sea by flow injection analysis with in-line pre-concentration on resin-immobilized 8-hydroxyquinoline and colorimetric detection.\u00a0Daily precision of analysis was +\/- 0.01 nM or 3.8%, whichever is larger, based on the reproducibility of analytical and internal standards. A conservative estimate of the limit of detection is 0.03 nM based on 3 times the daily precision of analysis, which is consistent with previous work. Two internal reference standards were run over the 57 days of the cruise, with DMn concentrations of 0.42 +\/-\u00a00.036 nM (+\/-\u00a08.4%; n = 102) and 0.31 +\/-\u00a00.041 nM (+\/-\u00a013%, n = 69), respectively.\u00a0The SAFe reference samples were analyzed simultaneously during sample analysis with the following results: for SAFe S, 0.85 +\/-\u00a00.026 nM (n = 27; consensus value = 0.79 +\/-\u00a00.06 nM); for SAFe D2, 0.40 +\/- 0.028 nM (n = 22; consensus value = 0.35 +\/-\u00a00.05); and for SAFe D1, 0.36 +\/-\u00a00.026 nM (n = 31; no consensus value).\u00a0<\/p>\n
Intercalibration information:<\/strong> This intercalibration was accepted by the International GEOTRACES Standards and Intercalbration Committee.<\/p>\n Related References:<\/strong> Concentrations of dissolved manganese in water-column samples from major stations that were occupied during the U.S. GEOTRACES Eastern Pacific Zonal Transect cruise (GEOTRACES cruise GP16). Note: These supersede the preliminary results of shipboard analyses listed as \u201cMn_DISS\u201d in the BCO-DMO file \"CTD \u2013 GT-C Bottle\".\u00a0<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"GP16 Dissolved Manganese","@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":"670692","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"GP16 Dissolved Manganese"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2016-12-20T13:19:32-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2016-12-20T13:19:32-05:00","@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:670692","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/670692"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier670692"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"Concentrations of dissolved manganese (Mn) in water-column samples from major stations that were occupied during the U.S. GEOTRACES EPZT cruise (R\/V Thomas G. 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\nIn addition to the reference standards reported above, we conducted an intercomparisson with three other labs University of California Santa Cruz, University of Southern Mississippi,\u00a0University of Miami. The stations considered were 1, 17 and 36 (for the UM\u00a0 group we compare only stations 17 and 36.)<\/p>\n
\nResing, J. A. & Mottl, M. J. Determination of manganese in seawater using flow injection analysis with on-line preconcentration and spectrophotometric detection. Anal. Chem. 64, 2682\u20132687 (1992).<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Concentrations of dissolved manganese (Mn) in water-column samples from major stations that were occupied during the U.S. GEOTRACES EPZT cruise","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":"
\nConcentrations were calculated using regressions fits to daily calibration curves obtained by additions of manganese standard solutions to low-manganese seawater.<\/p>\n
\n- modified parameter names to conform with BCO-DMO and GEOTRACES naming conventions;
\n- replaced missing data with 'nd' (no data);
\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- 30 June 2017: removed duplicate row for GEOTRACES sample #8332.<\/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