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Sediment cores were collected by divers, sealed in the filed with rubber stoppers and returned to the lab for processing.\u00a0 Pore waters were collected by inserting rhizon samplers (Seeberg-Elverfeldt et al., 2005) through pre-drilled holes in the core tubes.\u00a0 Samples were collected in gas-tight glass syringes and filtered through 0.45 \u00b5m nylon filters into storage vials.\u00a0 Alkalinity samples were titrated within 12hr of collection; other samples were returned to the lab for analysis, using techniques routinely used in my lab.<\/p>\n
Alkalinity and initial pH were determined by Gran Titration using a Metrohm automatic titrator (model 785 DMP Titrino) combined with a Cole-Parmer pH electrode, calibrated using pH 4.00, 7.00 and 10.00 NIST-traceable buffers (Hu and Burdige, 2008).\u00a0 Sulfate was determined by ion chromatography and conductivity detection with a Thermo-Fisher Dionex ICS-5000 ion chromatograph, while DOC was determined by high-temperature combustion using a Shimadzu TOC-V total carbon analyzer (Burdige and Komada, 2011; Komada et al. 2016).\u00a0 Ammonium and DIC were determined by FIA analysis using a home-built system consisting of a Rainin Rabbit peristaltic pump and a Dionex CDM-II conductivity detector (Hall and Aller, 1992; Lustwerk and Burdige, 1995).\u00a0 Total dissolved sulfide was determined spectrophotometrically with an Ocean Optics USB400 UV-Vis spectrophotometer (Cline, 1969; Abdulla et al., in prep.); Total dissolved iron was also determined spectrophotometrically by the ferrozine method using the same spectrophotometer\u00a0 (Viollier et al., 2000).<\/p>\n
Oxygen profiles in the cores were collected with polarographic microelectrodes (Luther et al., 2008) using a DLK 70 WebPstat electrochemical analyzer (AIS, Inc.) and a computer-controlled micro-profiler.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"GoM core metadata","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":"
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BCO-DMO Processing Notes:
\n- added conventional header with dataset name, PI name, version date
\n- modified parameter names to conform with BCO-DMO naming conventions
\n- added columns for site, lat, and lon
\n- reformatted collection date and time from m\/d\/yyyy H:MM to YYYY-MM-DDTHH:MM:SS (ISO 8601:2004\u20ac )
\n- replaced empty cell with - to distinguish them from x (all cells must be non-empty in our current system
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