http://lod.bco-dmo.org/id/dataset/1000880 eng; USA utf8 dataset Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact 2026-06-11 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Geochemical measurements of porewater and sediment from push core samples collected in the Gulf of California during R/V Atlantis cruise AT50-22 in 2024 2026-09-04 publication 2026-09-04 revision BCO-DMO Linked Data URI 2026-09-04 creation http://lod.bco-dmo.org/id/dataset/1000880 Samantha B. Joye University of Georgia principalInvestigator Kimberley Hunter University of Georgia principalInvestigator Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. publisher Cite this dataset as: Joye, S. B., Hunter, K. (2026) Geochemical measurements of porewater and sediment from push core samples collected in the Gulf of California during R/V Atlantis cruise AT50-22 in 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-09-04 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/1000880 [access date] Geochemical measurements of porewater and sediment from AT50-22 Dataset Description: Methods and Sampling: &lt;p&gt;Sediment samples were collected by the HOV Alvin using PVC push cores. Upon arrival at the surface the cores were described and cataloged prior to being sectioned into discrete depth intervals. Porewater was separated from the sediment using a manually-actuated porewater press as described by Joye et al., 2004. Following the collection of porewater, the pressed sediment sample (mud-cake) was stored at -20°C for solid-phase analysis. Porewater and sediment samples were preserved and analyzed as follows:&lt;/p&gt; &lt;p&gt;&lt;strong&gt;1) Nutrients (DOC, TDN, NOx, NO2, NH4, PO4, TDP)&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 um regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047), collected into an HDPE bottle and stored frozen at -20°C until analysis.&amp;nbsp; Individual analytes were analyzed as follows:&lt;/p&gt; &lt;ul&gt; &lt;li&gt;DOC was determined using high temperature catalytic combustion and an NDIR detector following the method described in Sugimura and Suzuki, 1988.&amp;nbsp;&amp;nbsp;&lt;/li&gt; &lt;li&gt;TDN was determined using high temperature combustion and a chemiluminescence detector following the method described in Watanabe et. al, 2007.&lt;/li&gt; &lt;li&gt;NOx was determined using chemical reduction and a nitric oxide detector following the method described by Garside, 1982.&amp;nbsp;&amp;nbsp;&lt;/li&gt; &lt;li&gt;NO2 was determined using the colorimetric method described by Bendschneider and Robinson, 1952 (A new spectrophotometric method for the determination of nitrite in sea water. J. Mar. Res., 11: 87) as reproduced by Parsons, Marta, and Lalli, 1984.&lt;/li&gt; &lt;li&gt;NH4 was determined using the colorimetric method described by Solorzano, 1969.&lt;/li&gt; &lt;li&gt;PO4 was determined using the colorimetric method described by Strickland and Parsons, 1972.&lt;/li&gt; &lt;li&gt;TDP was determined using the colorimetric method described by Solorzano and Sharp, 1980.&amp;nbsp;&lt;/li&gt; &lt;/ul&gt; &lt;p&gt;&lt;strong&gt;2) NH4&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 15 mL centrifuge tube, preserved with phenol reagent and stored at 5°C until analysis using the colorimetric method described by Solorzano, 1969. Samples were analyzed on a Hach DR 3900 spectrophotometer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;3) Alkalinity&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 15 mL centrifuge tube and stored at 5°C until analysis. Alkalinity was determined using the spectrophotometric method described by Sarazin et al., 1999. Samples were analyzed on a Hach DR 3900 spectrophotometer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;4) H2S&lt;/strong&gt;: 2.0 mL unfiltered water sample was collected into a 15 mL centrifuge tube containing 500 uL of 20% zinc acetate and stored at 5°C until analysis.&amp;nbsp; H2S was determined using the colorimetric method described by Cline, 1969.&amp;nbsp; Samples were analyzed on a Hach DR 3900 spectrophotometer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;5) VFA&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial and stored frozen at -20°C until analysis. VFA (Glycolate, Lactate, Acetate, Formate, iso-Butyric Acid, Butyric Acid, iso-Valeric Acid, Valeric Acid) analysis was performed on a Dionex UltiMate 3000 HPLC with Hamilton PRP-1 Guard Column (Prod. No. 79445), Brownlee NewGuard RP-8 7 µm 15 x 3.2 mm guard column (Prod. No. 0711-0090) and Brownlee SPHERI-5 RP-8 5 µm 250 x 4.6 mm analytical column (Prod. No. 4427064) following the method of Albert and Martens, 1997.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;6) SO4&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using KOH eluent supplied by a Dionex EGC 500 KOH Eluent Generator Cartridge (Prod. No. 075778), Dionex CR-ATC Continuously Regenerated Trap Column (Prod. No. 088662), Dionex ADRS 600 Dynamically Regenerated Suppressor (Prod. No. 088666), Dionex IonPac AG18 Guard Column (Prod. No. 060551), Dionex IonPac AS18 Analytical Column (Prod. No. 060549) and Dionex CRD 200 Carbonate Removal Device (Prod. No. 062983). See Weston et al., 2006.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;7) Cl&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using KOH eluent supplied by a Dionex EGC 500 KOH Eluent Generator Cartridge (Prod. No. 075778), Dionex CR-ATC Continuously Regenerated Trap Column (Prod. No. 088662), Dionex ADRS 600 Dynamically Regenerated Suppressor (Prod. No. 088666), Dionex IonPac AG18 Guard Column (Prod. No. 060551), Dionex IonPac AS18 Analytical Column (Prod. No. 060549) and Dionex CRD 200 Carbonate Removal Device (Prod. No. 062983).&amp;nbsp; See Weston et al., 2006.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;8) Na&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047)&amp;nbsp;into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using Methanesulfonic Acid eluent supplied by a Dionex EGC 500 MSA Eluent Generator Cartridge (Prod. No. 076779), Dionex CR-CTC Continuously Regenerated Trap Column (Prod. No. 088663), Dionex CDRS 600 Dynamically Regenerated Suppressor (Prod. No. 088670CMD), Dionex IonPac CG12A Guard Column (Prod. No. 046076), Dionex IonPac CS12A Analytical Column (Prod. No. 046075).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;9) K&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using Methanesulfonic Acid eluent supplied by a Dionex EGC 500 MSA Eluent Generator Cartridge (Prod. No. 076779), Dionex CR-CTC Continuously Regenerated Trap Column (Prod. No. 088663), Dionex CDRS 600 Dynamically Regenerated Suppressor (Prod. No. 088670CMD), Dionex IonPac CG12A Guard Column (Prod. No. 046076), Dionex IonPac CS12A Analytical Column (Prod. No. 046075).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;10) Mg&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using Methanesulfonic Acid eluent supplied by a Dionex EGC 500 MSA Eluent Generator Cartridge (Prod. No. 076779), Dionex CR-CTC Continuously Regenerated Trap Column (Prod. No. 088663), Dionex CDRS 600 Dynamically Regenerated Suppressor (Prod. No. 088670CMD), Dionex IonPac CG12A Guard Column (Prod. No. 046076), Dionex IonPac CS12A Analytical Column (Prod. No. 046075).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;11) Ca&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using Methanesulfonic Acid eluent supplied by a Dionex EGC 500 MSA Eluent Generator Cartridge (Prod. No. 076779), Dionex CR-CTC Continuously Regenerated Trap Column (Prod. No. 088663), Dionex CDRS 600 Dynamically Regenerated Suppressor (Prod. No. 088670CMD), Dionex IonPac CG12A Guard Column (Prod. No. 046076), Dionex IonPac CS12A Analytical Column (Prod. No. 046075).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;12) Fe(II)&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 15 mL centrifuge tube and analyzed following a modified version of Stookey, 1970.&amp;nbsp; Samples were analyzed on Hach DR 3900 and Shimadzu UV-1601 spectrophotometers.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;13) pH&lt;/strong&gt;: Sediment pH was determined using an Oakton pH5S pH spear (Prod. No. 3563452) and measured immediately during core sectioning.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;14) Eh&lt;/strong&gt;: Sediment Eh was measured using a Mettler Toledo InLab Redox ORP Electrode (Prod. No. 51343203) and a Fisherbrand Accumet AP125 Portable Meter (Prod. No. 13-636-AP125A).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;15) Salinity&lt;/strong&gt;: Porewater salinity was determined using a Fisherbrand handheld refractometer (Prod. No. 12-561-335).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;16) DIC&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047). A 2.0 mL sample was injected into a N2-purged serum vial crimp-sealed with a butyl rubber stopper.&amp;nbsp; Samples were stored frozen at -20°C until analysis. Sample analysis was performed after thawing and acidifying samples with concentrated HCl to pH 0.&amp;nbsp; DIC concentration was determined by injecting headspace samples onto a Shimadzu GC-2014 FID-Methanizer with Supelco Carboxen 1010 PLOT 30 m x 0.53 mm Fused Silica Capillary Column (Prod. No. 25467).&amp;nbsp; Weston et al. 2006&lt;/p&gt; &lt;p&gt;&lt;strong&gt;17) Gases&lt;/strong&gt;: Methane, Ethane, Propane, iso-Butane, n-Butane and n-Pentane samples (3 cc whole sediment) were collected into a glass serum vial, preserved with 2 mL 2M N2-purged NaOH, crimp-sealed with a butyl rubber stopper and stored at room temperature until analysis.&amp;nbsp; Concentrations were determined by headspace analysis using an SRI 8610 GC-FID with Agilent J&amp;amp;W HP-PLOT Al2O3 S Capillary Column, 50 m, 0.53 mm, 15.00 μm (Prod. No. 19095P-S25E). See Joye et al., 2004.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;18) SOM&lt;/strong&gt;:&amp;nbsp; Sediment samples collected and analyzed for porosity were subsequently analyzed for Sediment Organic Matter.&amp;nbsp; SOM was determined by drying a sample of known mass at 80C, weighing, ashing at 500C, weighing and calculating weight loss on ignition.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;19) TPN&lt;/strong&gt;: The pressed sediment sample (mud-cake) was dried at 60C and then homogenized via grinding. TPN was determined by the method described by Gordon, Jr., 1969 as reproduced by Sharp, 1974. Samples were analyzed on a ThermoFinnigan FlashEA 1112 series NC Soil Analyzer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;20) TPC&lt;/strong&gt;: The pressed sediment sample (mud-cake) was dried at 60C and then homogenized via grinding. TPC was determined by the method described by Gordon, Jr., 1969 as reproduced by Sharp, 1974. Samples were analyzed on a ThermoFinnigan FlashEA 1112 series NC Soil Analyzer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;21) POC&lt;/strong&gt;: The pressed sediment sample (mud-cake) was dried at 60C, homogenized via grinding and then acidified via fuming in a desiccator with concentrated HCl.&amp;nbsp; POC was determined by the method described by Gordon, Jr., 1969 as reproduced by Sharp, 1974. Samples were analyzed on a ThermoFinnigan FlashEA 1112 series NC Soil Analyzer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;22) Calculated Values (NO3, DIN, DON, DOP, PIC)&lt;/strong&gt;:&amp;nbsp; These values were calculated as follows:&lt;/p&gt; &lt;ul&gt; &lt;li&gt;NO3 = NOx - NO2&lt;/li&gt; &lt;li&gt;DIN = NOx + NH4&lt;/li&gt; &lt;li&gt;DON = TDN - DIN&lt;/li&gt; &lt;li&gt;DOP = TDP - PO4&lt;/li&gt; &lt;li&gt;PIC = TPC - POC&lt;br /&gt; &amp;nbsp;&lt;/li&gt; &lt;/ul&gt; Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2049439 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2049439 onGoing Samantha B. Joye University of Georgia 706-542-5893 Dept. of Marine Sciences 325 Sanford Drive Athens GA 30602 USA mjoye@uga.edu pointOfContact Kimberley Hunter University of Georgia kshunter@uga.edu pointOfContact asNeeded Dataset Version: 1 Unknown Site Collection_DateTime Collection_Date Collection_Time Alvin_Dive_number Lat Long Depth Depth_Range Midpoint_Depth pH Eh salinity salinity_flag NO2 NO2_flag NOx NOx_flag NO3 NO3_flag DIN TDN NH4 DON PO4 TDP DOP DOP_flag DIN_DIP DON_DOP DOC Glycolate Glycolate_flag Lactate Acetate Acetate_flag Formate Formate_flag Propionate Propionate_flag Iso_Butyric_Acid Iso_Butyric_Acid_flag Butyric_Acid Butyric_Acid_flag Iso_Valeric_Acid_Succinate Iso_Valeric_Acid_Succinate_flag Valeric_Acid Valeric_Acid_flag Tot_VFA Alkalinity Methane Ethane Ethane_flag Propane Propane_flag iso_Butane iso_Butane_flag n_Butane n_Butane_flag n_Pentane n_Pentane_flag DIC H2S H2S_flag SO4 SO4_flag Cl Na K Mg Ca Fe_II Fe_II_flag SOM_LOI TPN TPC POC PIC Antek Instruments 7050 Nitric Oxide Detector SRI 8610 GC-FID Dionex UltiMate 3000 HPLC with UV/VIS Variable Wavelength Detector Dionex Integrion HPIC with Dionex AS-AP Autosampler Fisherbrand Accumet AP125 Portable Meter Oakton pH5S pH spear Fisherbrand handheld analog salinity refractometer Shimadzu GC-2014 FID with Methanizer Shimadzu TOC-Vcph Total Organic Carbon Analyzer with ASI-V Autosampler Hach DR 3900 spectrophotometer ThermoFinnigan FlashEA 1112 series NC Soil Analyzer Shimadzu UV-1601 spectrophotometer theme None, User defined site ISO_DateTime_UTC date time of day dive_id latitude longitude depth depth below seafloor sample description pH No BCO-DMO term salinity quality flag Nitrite flag Nitrogen oxides group Nitrate Dissolved Inorganic Nitrogen Total Dissolved Nitrogen Ammonium Dissolved Organic Nitrogen reactive phosphorus (PO4) phosphate Nitrogen to phosphorus ratio (N:P) dissolved organic Carbon acetate formate total alkalinity (TA) methane ethane propane dissolved inorganic Carbon H2S sulfate chlorine Sodium potassium Magnesium Calcium Total Particulate Nitrogen total particulate Carbon particulate organic Carbon (POC) particulate inorganic Carbon featureType BCO-DMO Standard Parameters Chemiluminescence NOx Analyzer Gas Chromatograph High-Performance Liquid Chromatograph Ion Chromatograph Multi Parameter Portable Meter pH Sensor Refractometer Shimadzu GC-2014 gas chromatograph Shimadzu Total Organic Carbon Analyzer TOC-VCPH Spectrophotometer Thermo Fisher Scientific Flash EA 1112 elemental analyzer UV Spectrophotometer-Shimadzu instrument BCO-DMO Standard Instruments AT50-22 service Deployment Activity Gulf of California place Locations otherRestrictions otherRestrictions Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use. Collaborative research: Regulation and dynamics of microbial communities and biogeochemical cycling in hydrothermally-influenced habitats in the Gulf of California https://osprey.bco-dmo.org/project/876801 Collaborative research: Regulation and dynamics of microbial communities and biogeochemical cycling in hydrothermally-influenced habitats in the Gulf of California <p><em>NSF Award Abstract:</em><br /> Oceanic hydrothermal ecosystems have captivated the imagination of scientists and the general public since their discovery ~40 years ago. These habitats are characterized by extremes in temperature and pH, low oxygen concentrations, and high concentrations of toxic metals. Despite this, these ecosystems support rich and abundant microbial communities that achieve high rates of biogeochemical cycling. This project supports unprecedented studies to identify the impact of chemical regimes on microbial and viral community composition, diversity, and activity in areas in the Gulf of California along a range of hydrothermalism and dissolve oxygen levels. The project provides training opportunities for undergraduate and graduate students. Results are communicated through talks and lectures, publications, and data sharing through public repositories. The work will be shared through Ocean Discovery Camp and Clubs for diverse middle school students, displays at the Georgia Museum of Art, and a collaboration with the BBC Planet Earth III – Oceans team. Through these cumulative efforts, the project will forge a strong legacy in education and in fostering ocean literacy and promoting ocean advocacy in the general public.</p> <p>The Gulf of California is a system where hydrothermal fluids flow through and alter sediment prior to discharge into deep waters. In sediments, fluid flow modulates biological dynamics through changes in carbon loading and electron accepter availability. In the water column, inorganic and organic energy sources are injected into hypoxic deep waters, creating dynamic chemical niches. This project studies how gradients in geochemistry shape and modulate the microbial and viral communities that carry out key biogeochemical reactions in sediments and in the water column of Guaymas and Pescadero Basins. The research integrates data streams from biogeochemistry, genomics, and microbiology, including single-cell activity approaches, to achieve unprecedented insight into regulatory mechanisms and dynamics. The project includes experiments and observations in the laboratory and at sea during an expedition on the R/V Atlantis with the deep submergence vehicle ALVIN in 2022. Key topics for investigation include: (1) Do variations in geochemical regimes select for metabolically plastic microbial populations? (2) Do different microbes become active under specific geochemical conditions or do the same microbes adapt to changing geochemical conditions? (3) What is the role of viruses in shaping the microbial populations present in highly dynamic hydrothermal habitats?</p> <p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p> GoC Microbial Biogeochem largerWorkCitation project eng; USA oceans Gulf of California -111.46374 -108.85566 23.94152 27.58194 2024-04-08 2024-04-25 Gulf of California 0 BCO-DMO catalogue of parameters from Geochemical measurements of porewater and sediment from push core samples collected in the Gulf of California during R/V Atlantis cruise AT50-22 in 2024 Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact http://lod.bco-dmo.org/id/dataset-parameter/1007067.rdf Name: Site Units: unitless Description: <p>Site name</p> http://lod.bco-dmo.org/id/dataset-parameter/1007068.rdf Name: Collection_DateTime Units: unitless Description: <p>Datetime of samples collection</p> http://lod.bco-dmo.org/id/dataset-parameter/1007070.rdf Name: Collection_Date Units: unitless Description: <p>Date of samples collection</p> http://lod.bco-dmo.org/id/dataset-parameter/1007071.rdf Name: Collection_Time Units: unitless Description: <p>Time of sample collection (24 hr)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007072.rdf Name: Alvin_Dive_number Units: unitless Description: <p>Alvin dive number</p> http://lod.bco-dmo.org/id/dataset-parameter/1007073.rdf Name: Lat Units: Degrees, decimal min Description: <p>Latitude of sample collection, positive is North</p> http://lod.bco-dmo.org/id/dataset-parameter/1007075.rdf Name: Long Units: Degrees, decimal min Description: <p>Longitude of sample collection, negative is West</p> http://lod.bco-dmo.org/id/dataset-parameter/1007077.rdf Name: Depth Units: Meters (m) Description: <p>Seafloor depth from which sample was collected</p> http://lod.bco-dmo.org/id/dataset-parameter/1007079.rdf Name: Depth_Range Units: Centimeters (cm) Description: <p>Depth range below the seafloor. Range equals the minimum (shallowest) depth of the sediment layer from which the sample was taken to the maximum (deepest) depth of the sediment layer from which the sample was taken. OWL = Overlying water sample.</p> http://lod.bco-dmo.org/id/dataset-parameter/1007080.rdf Name: Midpoint_Depth Units: Centimeters (cm) Description: <p>The mid-point depth of the sediment layer from which the sample was taken. OWL = Overlying water sample.</p> http://lod.bco-dmo.org/id/dataset-parameter/1007081.rdf Name: pH Units: pH scale Description: <p>pH of the sediment layer</p> http://lod.bco-dmo.org/id/dataset-parameter/1007082.rdf Name: Eh Units: Millivolts (mV) Description: <p>Eh of the sediment layer</p> http://lod.bco-dmo.org/id/dataset-parameter/1007083.rdf Name: salinity Units: Practical salinity units (psu) Description: <p>Salinity of the sediment layer. Method detection limit = 0</p> http://lod.bco-dmo.org/id/dataset-parameter/1007084.rdf Name: salinity_flag Units: unitless Description: <p>Flag indicating quality of salinity value</p> http://lod.bco-dmo.org/id/dataset-parameter/1007085.rdf Name: NO2 Units: micromolar (umol/L) Description: <p>Nitrite. Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007086.rdf Name: NO2_flag Units: unitless Description: <p>Flag indicating whether NO2 value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007087.rdf Name: NOx Units: micromolar (umol/L) Description: <p>Nitrate + Nitrite. Method detection limit = 0.5 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007088.rdf Name: NOx_flag Units: unitless Description: <p>Flag indicating whether NOx value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007089.rdf Name: NO3 Units: micromolar (umol/L) Description: <p>Nitrate. Method detection limit = 0.5 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007090.rdf Name: NO3_flag Units: unitless Description: <p>Flag indicating whether NO3 value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007091.rdf Name: DIN Units: micromolar (umol/L) Description: <p>Dissolved Inorganic Nitrogen. Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007092.rdf Name: TDN Units: micromolar (umol/L) Description: <p>Total Dissolved Nitrogen. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007093.rdf Name: NH4 Units: micromolar (umol/L) Description: <p>Ammonium, home laboratory measurement. Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007094.rdf Name: DON Units: micromolar (umol/L) Description: <p>Dissolved Organic Nitrogen. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007095.rdf Name: PO4 Units: micromolar (umol/L) Description: <p>Phosphate. Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007096.rdf Name: TDP Units: micromolar (umol/L) Description: <p>Total Dissolved Phosphate. Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007097.rdf Name: DOP Units: micromolar (umol/L) Description: <p>Dissolved Organic Phosphate. Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007098.rdf Name: DOP_flag Units: unitless Description: <p>Flag indicating whether DOP value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007099.rdf Name: DIN_DIP Units: unitless Description: <p>Dissolved Inorganic N:P ratio. molar ratio.</p> http://lod.bco-dmo.org/id/dataset-parameter/1007100.rdf Name: DON_DOP Units: unitless Description: <p>Dissolved Organic N:P ratio. molar ratio.</p> http://lod.bco-dmo.org/id/dataset-parameter/1007101.rdf Name: DOC Units: micromolar (umol/L) Description: <p>Dissolved Organic Carbon. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007102.rdf Name: Glycolate Units: micromolar (umol/L) Description: <p>Glycolate: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007103.rdf Name: Glycolate_flag Units: unitless Description: <p>Flag indicating whether Glycolate value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007104.rdf Name: Lactate Units: micromolar (umol/L) Description: <p>Lactate: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007105.rdf Name: Acetate Units: micromolar (umol/L) Description: <p>Acetate: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007106.rdf Name: Acetate_flag Units: unitless Description: <p>Flag indicating whether Acetate value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007107.rdf Name: Formate Units: micromolar (umol/L) Description: <p>Formate: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007108.rdf Name: Formate_flag Units: unitless Description: <p>Flag indicating whether Formate value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007109.rdf Name: Propionate Units: micromolar (umol/L) Description: <p>Propionate: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007110.rdf Name: Propionate_flag Units: unitless Description: <p>Flag indicating whether Propionate value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007111.rdf Name: Iso_Butyric_Acid Units: micromolar (umol/L) Description: <p>Iso-Butyric Acid: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007112.rdf Name: Iso_Butyric_Acid_flag Units: unitless Description: <p>Flag indicating whether Iso_Butyric_Acid value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007113.rdf Name: Butyric_Acid Units: micromolar (umol/L) Description: <p>Butyric Acid: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007114.rdf Name: Butyric_Acid_flag Units: unitless Description: <p>Flag indicating whether Butyric_Acid value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007115.rdf Name: Iso_Valeric_Acid_Succinate Units: micromolar (umol/L) Description: <p>Iso-Valeric Acid and Succinate: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007116.rdf Name: Iso_Valeric_Acid_Succinate_flag Units: unitless Description: <p>Flag indicating whether Iso_Valeric_Acid_Succinate value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007117.rdf Name: Valeric_Acid Units: micromolar (umol/L) Description: <p>Valeric Acid: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007118.rdf Name: Valeric_Acid_flag Units: unitless Description: <p>Flag indicating whether Valeric_Acid value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007119.rdf Name: Tot_VFA Units: micromolar (umol/L) Description: <p>Total Volatile Fatty Acids: Method detection limit = 0.1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007120.rdf Name: Alkalinity Units: millimolar (mm/L) Description: <p>Alkalinity. Method detection limit = 0.1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007121.rdf Name: Methane Units: micromolar (umol/L) Description: <p>Dissolved Methane. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007122.rdf Name: Ethane Units: micromolar (umol/L) Description: <p>Dissolved Ethane. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007123.rdf Name: Ethane_flag Units: unitless Description: <p>Flag indicating whether Ethane value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007124.rdf Name: Propane Units: micromolar (umol/L) Description: <p>Dissolved Propane. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007125.rdf Name: Propane_flag Units: unitless Description: <p>Flag indicating whether Propane value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007126.rdf Name: iso_Butane Units: micromolar (umol/L) Description: <p>Dissolved iso-Butane. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007127.rdf Name: iso_Butane_flag Units: unitless Description: <p>Flag indicating whether iso_Butane value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007128.rdf Name: n_Butane Units: micromolar (umol/L) Description: <p>Dissolved n-Butane. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007129.rdf Name: n_Butane_flag Units: unitless Description: <p>Flag indicating whether n_Butane value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007130.rdf Name: n_Pentane Units: micromolar (umol/L) Description: <p>Dissolved n-Pentane. Method detection limit = 1 umol/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007131.rdf Name: n_Pentane_flag Units: unitless Description: <p>Flag indicating whether n_Pentane value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007132.rdf Name: DIC Units: millimolar (mm/L) Description: <p>Dissolved Inorganic Carbon. Method detection limit = 0.1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007133.rdf Name: H2S Units: millimolar (mm/L) Description: <p>Hydrogen Sulfide. Method detection limit = 1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007134.rdf Name: H2S_flag Units: unitless Description: <p>Flag indicating whether H2S value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007135.rdf Name: SO4 Units: millimolar (mm/L) Description: <p>Sulfate. Method detection limit = 0.1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007136.rdf Name: SO4_flag Units: unitless Description: <p>Flag indicating whether SO4 value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007137.rdf Name: Cl Units: millimolar (mm/L) Description: <p>Chloride. Method detection limit = 1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007138.rdf Name: Na Units: millimolar (mm/L) Description: <p>Sodium. Method detection limit = 1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007139.rdf Name: K Units: millimolar (mm/L) Description: <p>Potassium. Method detection limit = 0.1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007140.rdf Name: Mg Units: millimolar (mm/L) Description: <p>Magnesium. Method detection limit = 0.1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007141.rdf Name: Ca Units: millimolar (mm/L) Description: <p>Calcium. Method detection limit = 0.1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007142.rdf Name: Fe_II Units: micromolar (umol/L) Description: <p>Dissolved Iron (II). Method detection limit = 0.1 mm/L</p> http://lod.bco-dmo.org/id/dataset-parameter/1007143.rdf Name: Fe_II_flag Units: unitless Description: <p>Flag indicating whether Fe_II value is below detection limit (BDL)</p> http://lod.bco-dmo.org/id/dataset-parameter/1007144.rdf Name: SOM_LOI Units: percent Description: <p>Sediment Organic matter. Method detection limit = 1%</p> http://lod.bco-dmo.org/id/dataset-parameter/1007145.rdf Name: TPN Units: percent Description: <p>Total Particulate Nitrogen. Method detection limit = 0.1%</p> http://lod.bco-dmo.org/id/dataset-parameter/1007146.rdf Name: TPC Units: percent Description: <p>Total Particulate Carbon. Method detection limit = 0.1%</p> http://lod.bco-dmo.org/id/dataset-parameter/1007147.rdf Name: POC Units: percent Description: <p>Particulate Organic Carbon. Method detection limit = 0.1%</p> http://lod.bco-dmo.org/id/dataset-parameter/1007148.rdf Name: PIC Units: percent Description: <p>Particulate Inorganic Carbon. Method detection limit = 0.1%</p> GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact https://osprey.bco-dmo.org/dataset/1000880/data/download download onLine dataset &lt;p&gt;Sediment samples were collected by the HOV Alvin using PVC push cores. Upon arrival at the surface the cores were described and cataloged prior to being sectioned into discrete depth intervals. Porewater was separated from the sediment using a manually-actuated porewater press as described by Joye et al., 2004. Following the collection of porewater, the pressed sediment sample (mud-cake) was stored at -20°C for solid-phase analysis. Porewater and sediment samples were preserved and analyzed as follows:&lt;/p&gt; &lt;p&gt;&lt;strong&gt;1) Nutrients (DOC, TDN, NOx, NO2, NH4, PO4, TDP)&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 um regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047), collected into an HDPE bottle and stored frozen at -20°C until analysis.&amp;nbsp; Individual analytes were analyzed as follows:&lt;/p&gt; &lt;ul&gt; &lt;li&gt;DOC was determined using high temperature catalytic combustion and an NDIR detector following the method described in Sugimura and Suzuki, 1988.&amp;nbsp;&amp;nbsp;&lt;/li&gt; &lt;li&gt;TDN was determined using high temperature combustion and a chemiluminescence detector following the method described in Watanabe et. al, 2007.&lt;/li&gt; &lt;li&gt;NOx was determined using chemical reduction and a nitric oxide detector following the method described by Garside, 1982.&amp;nbsp;&amp;nbsp;&lt;/li&gt; &lt;li&gt;NO2 was determined using the colorimetric method described by Bendschneider and Robinson, 1952 (A new spectrophotometric method for the determination of nitrite in sea water. J. Mar. Res., 11: 87) as reproduced by Parsons, Marta, and Lalli, 1984.&lt;/li&gt; &lt;li&gt;NH4 was determined using the colorimetric method described by Solorzano, 1969.&lt;/li&gt; &lt;li&gt;PO4 was determined using the colorimetric method described by Strickland and Parsons, 1972.&lt;/li&gt; &lt;li&gt;TDP was determined using the colorimetric method described by Solorzano and Sharp, 1980.&amp;nbsp;&lt;/li&gt; &lt;/ul&gt; &lt;p&gt;&lt;strong&gt;2) NH4&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 15 mL centrifuge tube, preserved with phenol reagent and stored at 5°C until analysis using the colorimetric method described by Solorzano, 1969. Samples were analyzed on a Hach DR 3900 spectrophotometer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;3) Alkalinity&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 15 mL centrifuge tube and stored at 5°C until analysis. Alkalinity was determined using the spectrophotometric method described by Sarazin et al., 1999. Samples were analyzed on a Hach DR 3900 spectrophotometer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;4) H2S&lt;/strong&gt;: 2.0 mL unfiltered water sample was collected into a 15 mL centrifuge tube containing 500 uL of 20% zinc acetate and stored at 5°C until analysis.&amp;nbsp; H2S was determined using the colorimetric method described by Cline, 1969.&amp;nbsp; Samples were analyzed on a Hach DR 3900 spectrophotometer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;5) VFA&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial and stored frozen at -20°C until analysis. VFA (Glycolate, Lactate, Acetate, Formate, iso-Butyric Acid, Butyric Acid, iso-Valeric Acid, Valeric Acid) analysis was performed on a Dionex UltiMate 3000 HPLC with Hamilton PRP-1 Guard Column (Prod. No. 79445), Brownlee NewGuard RP-8 7 µm 15 x 3.2 mm guard column (Prod. No. 0711-0090) and Brownlee SPHERI-5 RP-8 5 µm 250 x 4.6 mm analytical column (Prod. No. 4427064) following the method of Albert and Martens, 1997.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;6) SO4&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using KOH eluent supplied by a Dionex EGC 500 KOH Eluent Generator Cartridge (Prod. No. 075778), Dionex CR-ATC Continuously Regenerated Trap Column (Prod. No. 088662), Dionex ADRS 600 Dynamically Regenerated Suppressor (Prod. No. 088666), Dionex IonPac AG18 Guard Column (Prod. No. 060551), Dionex IonPac AS18 Analytical Column (Prod. No. 060549) and Dionex CRD 200 Carbonate Removal Device (Prod. No. 062983). See Weston et al., 2006.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;7) Cl&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using KOH eluent supplied by a Dionex EGC 500 KOH Eluent Generator Cartridge (Prod. No. 075778), Dionex CR-ATC Continuously Regenerated Trap Column (Prod. No. 088662), Dionex ADRS 600 Dynamically Regenerated Suppressor (Prod. No. 088666), Dionex IonPac AG18 Guard Column (Prod. No. 060551), Dionex IonPac AS18 Analytical Column (Prod. No. 060549) and Dionex CRD 200 Carbonate Removal Device (Prod. No. 062983).&amp;nbsp; See Weston et al., 2006.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;8) Na&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047)&amp;nbsp;into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using Methanesulfonic Acid eluent supplied by a Dionex EGC 500 MSA Eluent Generator Cartridge (Prod. No. 076779), Dionex CR-CTC Continuously Regenerated Trap Column (Prod. No. 088663), Dionex CDRS 600 Dynamically Regenerated Suppressor (Prod. No. 088670CMD), Dionex IonPac CG12A Guard Column (Prod. No. 046076), Dionex IonPac CS12A Analytical Column (Prod. No. 046075).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;9) K&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using Methanesulfonic Acid eluent supplied by a Dionex EGC 500 MSA Eluent Generator Cartridge (Prod. No. 076779), Dionex CR-CTC Continuously Regenerated Trap Column (Prod. No. 088663), Dionex CDRS 600 Dynamically Regenerated Suppressor (Prod. No. 088670CMD), Dionex IonPac CG12A Guard Column (Prod. No. 046076), Dionex IonPac CS12A Analytical Column (Prod. No. 046075).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;10) Mg&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using Methanesulfonic Acid eluent supplied by a Dionex EGC 500 MSA Eluent Generator Cartridge (Prod. No. 076779), Dionex CR-CTC Continuously Regenerated Trap Column (Prod. No. 088663), Dionex CDRS 600 Dynamically Regenerated Suppressor (Prod. No. 088670CMD), Dionex IonPac CG12A Guard Column (Prod. No. 046076), Dionex IonPac CS12A Analytical Column (Prod. No. 046075).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;11) Ca&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 7 mL scintillation vial. Samples were acidified with 10 μL of concentrated HNO3 per 1 mL sample, sealed with a PTFE lined cap, and stored at room temperature until analysis. Sample analysis was performed with a Dionex Integrion HPIC using Methanesulfonic Acid eluent supplied by a Dionex EGC 500 MSA Eluent Generator Cartridge (Prod. No. 076779), Dionex CR-CTC Continuously Regenerated Trap Column (Prod. No. 088663), Dionex CDRS 600 Dynamically Regenerated Suppressor (Prod. No. 088670CMD), Dionex IonPac CG12A Guard Column (Prod. No. 046076), Dionex IonPac CS12A Analytical Column (Prod. No. 046075).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;12) Fe(II)&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047) into a 15 mL centrifuge tube and analyzed following a modified version of Stookey, 1970.&amp;nbsp; Samples were analyzed on Hach DR 3900 and Shimadzu UV-1601 spectrophotometers.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;13) pH&lt;/strong&gt;: Sediment pH was determined using an Oakton pH5S pH spear (Prod. No. 3563452) and measured immediately during core sectioning.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;14) Eh&lt;/strong&gt;: Sediment Eh was measured using a Mettler Toledo InLab Redox ORP Electrode (Prod. No. 51343203) and a Fisherbrand Accumet AP125 Portable Meter (Prod. No. 13-636-AP125A).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;15) Salinity&lt;/strong&gt;: Porewater salinity was determined using a Fisherbrand handheld refractometer (Prod. No. 12-561-335).&lt;/p&gt; &lt;p&gt;&lt;strong&gt;16) DIC&lt;/strong&gt;: Water sample was filtered through a pre-rinsed 0.2 μm regenerated cellulose Target2 syringe filter (Thermo Scientific, Prod. No. F25047). A 2.0 mL sample was injected into a N2-purged serum vial crimp-sealed with a butyl rubber stopper.&amp;nbsp; Samples were stored frozen at -20°C until analysis. Sample analysis was performed after thawing and acidifying samples with concentrated HCl to pH 0.&amp;nbsp; DIC concentration was determined by injecting headspace samples onto a Shimadzu GC-2014 FID-Methanizer with Supelco Carboxen 1010 PLOT 30 m x 0.53 mm Fused Silica Capillary Column (Prod. No. 25467).&amp;nbsp; Weston et al. 2006&lt;/p&gt; &lt;p&gt;&lt;strong&gt;17) Gases&lt;/strong&gt;: Methane, Ethane, Propane, iso-Butane, n-Butane and n-Pentane samples (3 cc whole sediment) were collected into a glass serum vial, preserved with 2 mL 2M N2-purged NaOH, crimp-sealed with a butyl rubber stopper and stored at room temperature until analysis.&amp;nbsp; Concentrations were determined by headspace analysis using an SRI 8610 GC-FID with Agilent J&amp;amp;W HP-PLOT Al2O3 S Capillary Column, 50 m, 0.53 mm, 15.00 μm (Prod. No. 19095P-S25E). See Joye et al., 2004.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;18) SOM&lt;/strong&gt;:&amp;nbsp; Sediment samples collected and analyzed for porosity were subsequently analyzed for Sediment Organic Matter.&amp;nbsp; SOM was determined by drying a sample of known mass at 80C, weighing, ashing at 500C, weighing and calculating weight loss on ignition.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;19) TPN&lt;/strong&gt;: The pressed sediment sample (mud-cake) was dried at 60C and then homogenized via grinding. TPN was determined by the method described by Gordon, Jr., 1969 as reproduced by Sharp, 1974. Samples were analyzed on a ThermoFinnigan FlashEA 1112 series NC Soil Analyzer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;20) TPC&lt;/strong&gt;: The pressed sediment sample (mud-cake) was dried at 60C and then homogenized via grinding. TPC was determined by the method described by Gordon, Jr., 1969 as reproduced by Sharp, 1974. Samples were analyzed on a ThermoFinnigan FlashEA 1112 series NC Soil Analyzer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;21) POC&lt;/strong&gt;: The pressed sediment sample (mud-cake) was dried at 60C, homogenized via grinding and then acidified via fuming in a desiccator with concentrated HCl.&amp;nbsp; POC was determined by the method described by Gordon, Jr., 1969 as reproduced by Sharp, 1974. Samples were analyzed on a ThermoFinnigan FlashEA 1112 series NC Soil Analyzer.&lt;/p&gt; &lt;p&gt;&lt;strong&gt;22) Calculated Values (NO3, DIN, DON, DOP, PIC)&lt;/strong&gt;:&amp;nbsp; These values were calculated as follows:&lt;/p&gt; &lt;ul&gt; &lt;li&gt;NO3 = NOx - NO2&lt;/li&gt; &lt;li&gt;DIN = NOx + NH4&lt;/li&gt; &lt;li&gt;DON = TDN - DIN&lt;/li&gt; &lt;li&gt;DOP = TDP - PO4&lt;/li&gt; &lt;li&gt;PIC = TPC - POC&lt;br /&gt; &amp;nbsp;&lt;/li&gt; &lt;/ul&gt; Specified by the Principal Investigator(s) &lt;p&gt;DOC and TDN data were processed using Shimadzu TOC-Control V software. NOx and CH4 data were processed using SRI Instruments PeakSimple software. VFA, SO4, Cl, Na, K, Mg, and Ca data were processed using DIONEX Chromeleon software. DIC data was processed using Shimadzu GCsolution software.&lt;/p&gt; Specified by the Principal Investigator(s) This section documents curation actions performed prior to publication review with the submitter, and additional information relevant to understanding and reusing this dataset. It distinguishes changes made to the submitted (meta)data from unresolved issues and/or enhancements that improve future reuse and interoperability. CURATION ACTIONS PERFORMED ON DATA - Loaded AT50-22 Porewater Geochemistry V2.xlsx (Sheet1), header row 11, units row 12 skipped, deduplicated blank headers, missing values &quot;&quot;, &quot;nd&quot;, &quot;ND&quot; configured, preserving Excel display formatting and adjusting floating point error - Deleted two blank spacer columns (named &quot; (1)&quot; and &quot; (2)&quot;) between salinity/NO2 and DON:DOP/DOC - Renamed columns containing disallowed characters to underscore-based names (e.g. Collection Date to Collection_Date, Lat (N) to Lat, Long (W) to Long, Depth Range to Depth_Range, Mid-point Depth to Midpoint_Depth, DIN:DIP to DIN_DIP, DON:DOP to DON_DOP, Iso-Butyric Acid to Iso_Butyric_Acid, Butyric Acid to Butyric_Acid, Iso-Valeric Acid + Succinate to Iso_Valeric_Acid_Succinate, Valeric Acid to Valeric_Acid, Tot VFA to Tot_VFA, iso-Butane to iso_Butane, n-Butane to n_Butane, n-Pentane to n_Pentane, Fe (II) to Fe_II, SOM (LOI) to SOM_LOI, Alvin Dive # to Alvin_Dive_number) - Normalized date separators in Collection_Date from &quot;/&quot; to &quot;-&quot; for consistent DD-MM-YY format - Combined normalized Collection_Date and Collection_Time into new Collection_DateTime string column in ISO 8601 format without seconds or timezone, since source lacked seconds and UTC offset - Converted Collection_Date to an ISO date-typed column in UTC - Reordered columns into a defined sequence - Extracted non-numeric values (e.g. &quot;BDL&quot;) from numeric-capable chemistry columns into new &quot;_flag&quot; columns, leaving the original numeric columns null where non-numeric - Removed flag columns with no BDL occurrences in the sample data (TDP_flag, DIN_DIP_flag, DON_DOP_flag, DOC_flag, Tot_VFA_flag, Alkalinity_flag, DIC_flag, Cl_flag, Na_flag, K_flag, Mg_flag, Ca_flag, SOM_LOI_flag, TPN_flag, TPC_flag, POC_flag, PIC_flag, DIN_flag, TDN_flag, NH4_flag, DON_flag, PO4_flag, Lactate_flag, Methane_flag) - Output as 1000880_v1_porewater_geochemistry.csv CURATION ACTIONS PERFORMED ON METADATA - BCO-DMO's standard metadata entry and text formatting steps were performed. See: https://www.bco-dmo.org/how-to/standard-curation-edits ISSUES POTENTIALLY IMPACTING REUSE - Collection times provided do not clarify timezone. Specified by BCO-DMO Data Managers asNeeded 7.x-1.1 Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact Antek Instruments 7050 Nitric Oxide Detector Antek Instruments 7050 Nitric Oxide Detector PI Supplied Instrument Name: Antek Instruments 7050 Nitric Oxide Detector PI Supplied Instrument Description:NOx: Antek Instruments 7050 Nitric Oxide Detector with 745 Nitrate/Nitrite Reduction Assembly Instrument Name: Chemiluminescence NOx Analyzer Instrument Short Name: Instrument Description: The chemiluminescence method for gas analysis of oxides of nitrogen relies on the measurement of light produced by the gas-phase titration of nitric oxide and ozone. A chemiluminescence analyzer can measure the concentration of NO/NO2/NOX. One example is the Teledyne Model T200: https://www.teledyne-api.com/products/nitrogen-compound-instruments/t200 SRI 8610 GC-FID SRI 8610 GC-FID PI Supplied Instrument Name: SRI 8610 GC-FID PI Supplied Instrument Description:CH4: SRI 8610 GC-FID Instrument Name: Gas Chromatograph Instrument Short Name:Gas Chromatograph Instrument Description: Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC) Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB02/ Dionex UltiMate 3000 HPLC with UV/VIS Variable Wavelength Detector Dionex UltiMate 3000 HPLC with UV/VIS Variable Wavelength Detector PI Supplied Instrument Name: Dionex UltiMate 3000 HPLC with UV/VIS Variable Wavelength Detector PI Supplied Instrument Description:VFA: Dionex UltiMate 3000 HPLC with UV/VIS Variable Wavelength Detector Instrument Name: High-Performance Liquid Chromatograph Instrument Short Name:HPLC Instrument Description: A High-performance liquid chromatograph (HPLC) is a type of liquid chromatography used to separate compounds that are dissolved in solution. HPLC instruments consist of a reservoir of the mobile phase, a pump, an injector, a separation column, and a detector. Compounds are separated by high pressure pumping of the sample mixture onto a column packed with microspheres coated with the stationary phase. The different components in the mixture pass through the column at different rates due to differences in their partitioning behavior between the mobile liquid phase and the stationary phase. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB11/ Dionex Integrion HPIC with Dionex AS-AP Autosampler Dionex Integrion HPIC with Dionex AS-AP Autosampler PI Supplied Instrument Name: Dionex Integrion HPIC with Dionex AS-AP Autosampler PI Supplied Instrument Description:SO4, Cl, Na, K, Mg, and Ca: Dionex Integrion HPIC with Dionex AS-AP Autosampler Instrument Name: Ion Chromatograph Instrument Short Name:Ion Chromatograph Instrument Description: Ion chromatography is a form of liquid chromatography that measures concentrations of ionic species by separating them based on their interaction with a resin. Ionic species separate differently depending on species type and size. Ion chromatographs are able to measure concentrations of major anions, such as fluoride, chloride, nitrate, nitrite, and sulfate, as well as major cations such as lithium, sodium, ammonium, potassium, calcium, and magnesium in the parts-per-billion (ppb) range. From: http://serc.carleton.edu/microbelife/research_methods/biogeochemical/ic.html Fisherbrand Accumet AP125 Portable Meter Fisherbrand Accumet AP125 Portable Meter PI Supplied Instrument Name: Fisherbrand Accumet AP125 Portable Meter PI Supplied Instrument Description:Eh: Fisherbrand Accumet AP125 Portable Meter with Mettler Toledo InLab Redox ORP Electrode Instrument Name: Multi Parameter Portable Meter Instrument Short Name: Instrument Description: An analytical instrument that can measure multiple parameters, such as pH, EC, TDS, DO and temperature with one device and is portable or hand-held. Oakton pH5S pH spear Oakton pH5S pH spear PI Supplied Instrument Name: Oakton pH5S pH spear PI Supplied Instrument Description:pH: Oakton pH5S pH spear Instrument Name: pH Sensor Instrument Short Name:pH Sensor Instrument Description: An instrument that measures the hydrogen ion activity in solutions. The overall concentration of hydrogen ions is inversely related to its pH.  The pH scale ranges from 0 to 14 and indicates whether acidic (more H+) or basic (less H+).  Fisherbrand handheld analog salinity refractometer Fisherbrand handheld analog salinity refractometer PI Supplied Instrument Name: Fisherbrand handheld analog salinity refractometer PI Supplied Instrument Description:Salinity: Fisherbrand handheld analog salinity refractometer Instrument Name: Refractometer Instrument Short Name:Refractometer Instrument Description: A refractometer is a laboratory or field device for the measurement of an index of refraction (refractometry). The index of refraction is calculated from Snell's law and can be calculated from the composition of the material using the Gladstone-Dale relation. In optics the refractive index (or index of refraction) n of a substance (optical medium) is a dimensionless number that describes how light, or any other radiation, propagates through that medium. Shimadzu GC-2014 FID with Methanizer Shimadzu GC-2014 FID with Methanizer PI Supplied Instrument Name: Shimadzu GC-2014 FID with Methanizer PI Supplied Instrument Description:DIC: Shimadzu GC-2014 FID with Methanizer Instrument Name: Shimadzu GC-2014 gas chromatograph Instrument Short Name:GC-2014 Instrument Description: The Shimadzu GC-2014 is a gas chromatograph that separates and analyses gas mixtures using either packed or capillary columns. The instrument comprises of a column oven, up to three injection units and up to four detectors. The sample is injected into the instrument and enters a gas stream which transports the sample into the column inside which the various components are separated. The detector then measures the quantity of the components that exit the column. Helium or nitrogen is used as the carrier gas. It can be fitted with a variety of detector types; Flame Ionization Detector (FID), Thermal Conductivity Detector (TCD), Electron Capture Detector (ECD), Flame Photometric Detector (FPD) and Flame Thermionic Detector (FTD). The GC-2014 is equipped with advanced flow controller technology which allows for accurate flow rate control and so a higher level repeatability of retention time and peak area. The instrument also includes an LCD which displays chromatograms and method parameters in real time. Shimadzu TOC-Vcph Total Organic Carbon Analyzer with ASI-V Autosampler Shimadzu TOC-Vcph Total Organic Carbon Analyzer with ASI-V Autosampler PI Supplied Instrument Name: Shimadzu TOC-Vcph Total Organic Carbon Analyzer with ASI-V Autosampler PI Supplied Instrument Description:DOC: Shimadzu TOC-Vcph Total Organic Carbon Analyzer with ASI-V Autosampler TDN: Shimadzu TOC-Vcph Total Organic Carbon Analyzer with ASI-V Autosampler and TNM-1 Total Nitrogen Measuring Unit Instrument Name: Shimadzu Total Organic Carbon Analyzer TOC-VCPH Instrument Short Name:TOC-VCPH Instrument Description: The Shimadzu Total Organic Carbon Analyzer TOC-VCPH is a PC-controlled, total organic carbon analyzer (high-sensitivity model), designed to measure total carbon (TC), inorganic carbon (IC), total organic carbon (TOC), and non-purgeable organic carbon (NPOC); an optional accessory enables the measurement of particulate organic carbon (POC) and total nitrogen (TN) as well. The instrument uses the 680 degrees Celsius combustion catalytic oxidation method to analyze aqueous samples, and optionally solid and gas samples. Hach DR 3900 spectrophotometer Hach DR 3900 spectrophotometer PI Supplied Instrument Name: Hach DR 3900 spectrophotometer PI Supplied Instrument Description:NH4: Hach DR 3900 spectrophotometer Alkalinity: Hach DR 3900 spectrophotometer Fe(II): Hach DR 3900 spectrophotometer and Shimadzu UV-1601 spectrophotometer Instrument Name: Spectrophotometer Instrument Short Name:Spectrophotometer Instrument Description: An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/ ThermoFinnigan FlashEA 1112 series NC Soil Analyzer ThermoFinnigan FlashEA 1112 series NC Soil Analyzer PI Supplied Instrument Name: ThermoFinnigan FlashEA 1112 series NC Soil Analyzer PI Supplied Instrument Description:TPN: ThermoFinnigan FlashEA 1112 series NC Soil Analyzer TPC: ThermoFinnigan FlashEA 1112 series NC Soil Analyzer POC: ThermoFinnigan FlashEA 1112 series NC Soil Analyzer Instrument Name: Thermo Fisher Scientific Flash EA 1112 elemental analyzer Instrument Short Name:Flash EA 1112 Instrument Description: The Thermo Finnigan {Thermo Fisher Scientific} Flash EA 1112 elemental analyzer is a laboratory instrument used to determine total carbon, hydrogen, nitrogen, sulphur, and oxygen in a sample. The sample is completely and instantaneously oxidised by flash combustion, which converts all organic and inorganic substances into combustion products. The resulting combustion gases pass through a reduction furnace and are swept into the chromatographic column by the helium carrier gas. The gases are separated in the column and detected by the thermal conductivity detector, which gives an output signal proportional to the concentration of the individual components of the mixture. The instrument was originally manufactured by Thermo Finnigan, which was acquired by Thermo Electron and later Thermo Scientific (part of Thermo Fisher Scientific). Shimadzu UV-1601 spectrophotometer Shimadzu UV-1601 spectrophotometer PI Supplied Instrument Name: Shimadzu UV-1601 spectrophotometer PI Supplied Instrument Description:NO2: Shimadzu UV-1601 spectrophotometer PO4: Shimadzu UV-1601 spectrophotometer TDP: Shimadzu UV-1601 spectrophotometer H2S: Shimadzu UV-1601 spectrophotometer Fe(II): Hach DR 3900 spectrophotometer and Shimadzu UV-1601 spectrophotometer Instrument Name: UV Spectrophotometer-Shimadzu Instrument Short Name:UV Spectrophotometer-Shimadzu Instrument Description: The Shimadzu UV Spectrophotometer is manufactured by Shimadzu Scientific Instruments (ssi.shimadzu.com). Shimadzu manufacturers several models of spectrophotometer; refer to dataset for make/model information. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/ Cruise: AT50-22 AT50-22 R/V Atlantis Community Standard Description International Council for the Exploration of the Sea R/V Atlantis vessel AT50-22 Samantha B. Joye University of Georgia R/V Atlantis Community Standard Description International Council for the Exploration of the Sea R/V Atlantis vessel