Seawater samples were collected with Niskin bottles on a CTD rosette deployed from the research vessel Thomas Thompson. Hydrothermal fluid samples were collected via ROV JASON II using the PMEL Hydrothermal Fluid and Particulate Sampler into 800 mL Tedlar bags.<\/p>\n
Particulates were collected by pumping 2-5 L of hydrothermal vent fluids through combusted GF\/F filters (precombusted) using the HFPS in situ. About 10 L of seawater collected with CTD-rosette Niskin bottles were filtered on board ship through combusted GF\/F filters.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"West Mata 2009 DOC,13C-POC, DON","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":"
Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) concentrations were measured by high-temperature (720\u00baC) combustion using a Shimadzu TOC-VCSH analyzer. Two consensus reference materials (CRM, from University of Miami, Dickson et al., 2007), Florida Strait 700 m-deep seawater (DSW) and low carbon water (LCW), were used.<\/p>\n
Nitrate-plus-nitrite (N+N) analysis was carried out with a colorimetric flow injection analyzer (Grasshoff et al., 1999).<\/p>\n
Ammonium concentrations were measured at the University of Hawaii with a flow injection-fluorometric method (Jones, 1991) and calibrated against gravimetrically prepared standards. The detection limit was 0.1 uM at the setting for measuring low concentrations of ammonium in the vent fluids. The analytical uncertainty was 0.03 uM.\u00a0<\/p>\n
Silicate was measured by colorimetry (Grasshoff et al., 1999).<\/p>\n
Total dissolved iron (1-sigma precision 4%) in vent fluids was measured by atomic absorption at PMEL\/Seattle on samples preserved shipboard with ultra-pure HCl (TraceMetal Grade).<\/p>\n
The total iron of acidified plume samples was measured by a Ferrozine colorimetry method (Gibbs, 1976; Stookey, 1970).<\/p>\n
The pH of was measured shipboard at laboratory temperature in a closed vessel using a glass pH electrode (Ross Sure-Flow) calibrated with NBS-certified buffers (Fisher Scientific). The precision of the measurement is 0.02 pH units.<\/p>\n
The POC and particulate nitrogen (PN) and isotopic compositions of acidified (with 1 N HCl) GF\/F samples were measured with a CN elemental analyzer (Costech, ECS 4010) connected in-line with an isotope ratio mass spectrometer (IRMS; Thermo Finnigan Delta XP) interfaced with a ConFloIV, at the University of Hawaii. The reference materials were extensively characterized with certified reference materials, including NBS 18, NBS 19, NIST 1547, NIST 3, USGS 32, USGS 34, and USGS 35.<\/p>\n
BCO-DMO Processing notes:<\/p>\n
- Converted date and time columns to 1 datetime column (ISO format)<\/li>\n
- Longitude on western hemisphere were converted to negative (-180,180 scale)<\/li>\n
- Renamed fields to comply with database requirements<\/li>\n<\/ul><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"844580","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"West Mata 2009 DOC,13C-POC, DON"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2021-03-09T20:29:59-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2021-03-09T20:29:59-05:00","@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:844580","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/844580"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier844580"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"DOC, POC, d13C-POC, PN from a diffuse vent in West Mata sampled in May 2009 using ROV Jason II deployed from R\/V Thomas Thompson.","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"DOC, POC, d13C-POC, PN from a diffuse vent in West Mata sampled in May 2009 using ROV Jason II deployed from R\/V Thomas Thompson.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/ocean-data.org\/schema\/temporalExtent":[{"@value":"_:temporalExtent844580"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage844580"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Lin, H., Butterfield, D. 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