http://lod.bco-dmo.org/id/dataset/925487 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 2024-04-22 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) In situ porewater data from the Cocos Ridge (Eastern Equatorial Pacific) acquired during cruise SR2113 between November - December 2021 2024-12-19 publication 2024-12-19 revision Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA) 2024-06-21 publication https://doi.org/10.26008/1912/bco-dmo.925487.1 Jess F. Adkins California Institute of Technology principalInvestigator William M. Berelson University of Southern California principalInvestigator Robert Byrne University of South Florida principalInvestigator Sijia Dong California Institute of Technology principalInvestigator Andrew Jacobson Northwestern University principalInvestigator Xuewu Liu University of South Florida principalInvestigator Frank J. Pavia California Institute of Technology principalInvestigator Anna Waldeck Northwestern University 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: Cetiner, J. E., Berelson, W. M., Rollins, N. E., Liu, X., Pavia, F. J., Waldeck, A., Dong, S., Fleger, K., Barnhart, H., Quinan, M., Wani, R., Jacobson, A., Byrne, R., Adkins, J. F. (2024) In situ porewater data from the Cocos Ridge (Eastern Equatorial Pacific) acquired during cruise SR2113 between November - December 2021. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2024-12-19 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.925487.2 [access date] Cocos Ridge Porewater Data v2 Dataset Description: Methods and Sampling: &lt;p&gt;Porewater pH samples were collected in 3-mL capacity gas-tight borosilicate glass syringes with triple O-ring seals. A 2 – 2.5 mL volume was drawn from each coil into a syringe. 1 mL of sample was added to a cuvette for A&lt;sub&gt;T&lt;/sub&gt; measurements and the remaining 1 mL was used for pH measurements. To each sample, 4 &lt;em&gt;μ&lt;/em&gt;L of 2 mM mCP (&lt;em&gt;R &lt;/em&gt;≃ 1.2) was added using a 10 &lt;em&gt;μ&lt;/em&gt;L Eppendorf Research pipette fitted with thin Teflon tubing at the end of the pipette tip. The sample with added dye was capped and thoroughly mixed, then housed in a custom-made cell warmer and thermostatted to 20°C (±0.05 °C). During the sampling process, care was taken to ensure that samples were not exposed to the atmosphere and that there was no entrapment of air bubbles within the syringe.&lt;/p&gt; &lt;p&gt;For small volume total alkalinity (A&lt;sub&gt;T&lt;/sub&gt;) measurements, 1 mL of sample was pipetted directly into a semi-micro cuvette (1-cm pathlength, Fisher Cat 14-955-127) with a syringe or an Eppendorf Research pipette. Samples were covered with a polyethylene cuvette stopper (Cat. S29264) and placed inside a semi-submerged cuvette tray thermostated to a set temperature (e.g., 20°C) in a large-capacity water bath (Lauda Ecoline RE 120 water bath).&lt;/p&gt; &lt;p&gt;DIC and d&lt;sup&gt;13&lt;/sup&gt;C of DIC were analyzed with a Picarro Cavity Ring-Down Spectrometer (G2131-i) with Liaison autosampler; the detailed methodology is described in Subhas et al. (2015). These measurements were made on board the ship. Dickson seawater CRM was used as the standard for DIC; pre-weighed optical calcite powder was used as the standard for d&lt;sup&gt;13&lt;/sup&gt;C. Exetainer vials were pre-acidified and pre-weighed in the lab prior to the cruise. After the vials were filled with 3-5 mL of porewater and analyzed on the cruise, the stored vials were weighed again in the lab to obtain the sample mass. Results using this methodology were corrected by normalizing to measured values of Dickson seawater CRM. Uncertainty (1σ) for replicate DIC and d&lt;sup&gt;13&lt;/sup&gt;C measurements were ±23 µmol/kg and ±0.15‰ (VPDB), respectively. DIC uncertainty was higher than reported in our previous studies (e.g., Subhas et al., 2015) likely due to mass determination: ship-board analysis necessitated weighing after analysis, but there was uncertainty in precisely how much sample mass may be removed during the analysis. Additionally, lower sample volume (5 mLs, instead of 7-8 mLs in our previous studies) may have added error.&lt;/p&gt; &lt;p&gt;Porewater dissolved manganese [Mn] was analyzed at Caltech by ICP-MS (inductively coupled plasma - mass spectrometry) using an Agilent 8800 triple-quadrupole instrument. In situ porewater samples were stored in acid-cleaned HDPE bottles and acidified using 6M distilled HCl. After at least one week, 1 mL aliquots were diluted 10:1 in distilled 5% HNO&lt;sub&gt;3&lt;/sub&gt; for ICP-MS analysis. Concentrations of [Mn] were determined via calibration to multi-element commercial ICP-MS standards, matrix-matched to samples by addition to artificial seawater and diluted in 5% HNO&lt;sub&gt;3&lt;/sub&gt;, identically to the samples. Blanks were assessed by analysis of both pure 5% nitric acid and artificial seawater with no metal standard added. ICP-MS measurements were made in MS/MS mode using He as a carrier gas in the collision cell. The detection limit was 0.03 μmol/kg [Mn].&lt;/p&gt; &lt;p&gt;Porewater calcium, strontium, and sodium were measured at Northwestern University using a Thermo iCap7600 ICP-OES (inductively coupled plasma - optical emission spectrometer). In order to capture signals from high- to low-abundance cations ([Na] and [Sr], respectively), samples were diluted 1:100, by mass, with trace metal clean 3% HNO&lt;sub&gt;3&lt;/sub&gt;. Each sample was weighed, diluted, and analyzed in five replicates. Samples were run in randomized order to account for any instrumental drift not corrected through standard bracketing. Cation concentrations were based on counts per second using two wavelengths from each cation (Ca393.366, Ca396.847, Sr407.771, Sr421.552, Na588.995, and Na589.592 nm). The two wavelengths for each element produced virtually identical results but were averaged, nonetheless. Calibration standards were synthetic mixtures of 1000 ppm cation solutions (Mg, Sr, Na, Ca, and K) diluted in 5% HNO&lt;sub&gt;3&lt;/sub&gt; to match expected sample concentrations. Calibration standards were used to correct for instrumental drift within a single run by interpolating between standards run at the beginning and end of the run. Blank measurements were made on HNO&lt;sub&gt;3 &lt;/sub&gt;and were included in the calibration curve to account for instrumental blank. IAPSO standard seawater was used to adjust for drift across multiple days. Between 3-8 IAPSO standards were measured every run; the IAPSO average in a single run was normalized to the IAPSO average for all runs. This normalization was applied to all porewater samples. In this manner, samples analyzed on different days were normalized to a single measured IAPSO average. [Ca] and [Sr] were normalized to [Na]; all stations had a CTD measured salinity of 34.6 ppt; salinity was converted to [Na] using a seawater Na:salinity ratio of 10.781 g/kg:35 ppt (Pilson, 1998). IAPSO seawater measurements had the following one standard error spreads: ± 0.026 mmol/kg Ca, ± 0.56 μmol/kg Sr, and 1.5 mmol/kg Na.&lt;/p&gt; &lt;p&gt;Porewater silica was measured at USC. A spectrophotometric molybdenum blue method, modified from&amp;nbsp;Parsons et al. (1984), was used to determine the concentration of silicic acid (H4SiO4 or DSi) in the pore water samples. Filtered pore water samples collected on the cruise were stored at 4°C and transported back to USC for analysis. Standards were made via dilution of 1,000 ppm Si standard solution (Aqua Solutions) in DSi free artificial seawater. The precision of this method, determined by duplicate analyses, was 1.3% for samples with DSi concentrations &amp;gt; 20 µM (&amp;lt; 20 µM analytical precision = 13.1%).&amp;nbsp;&lt;/p&gt; &lt;p&gt;Instruments:&lt;/p&gt; &lt;p&gt;The pH and total alkalinity (A&lt;sub&gt;T&lt;/sub&gt;) of porewater samples were measured using a multiparameter CO&lt;sub&gt;2&lt;/sub&gt; instrument named mvMICA (&lt;u&gt;m&lt;/u&gt;inimal &lt;u&gt;v&lt;/u&gt;olume &lt;u&gt;M&lt;/u&gt;ultiparameter-&lt;u&gt;I&lt;/u&gt;norganic &lt;u&gt;C&lt;/u&gt;arbon &lt;u&gt;A&lt;/u&gt;nalyzer). The mvMICA is a dual parameter system engineered to simultaneously measure A&lt;sub&gt;T&lt;/sub&gt; with sample volumes as low as 0.5 mL and pH with 1 and 1.5 mL (Fleger et al., &lt;em&gt;in prep&lt;/em&gt;). The mvMICA configuration consisted of pH and A&lt;sub&gt;T&lt;/sub&gt; channels encased in a thermoregulating water bath. Optical fibers connected channels to a custom tungsten halogen light source and Ocean Optics USB4000 spectrophotometers. Spectrophotometers were housed in a small refrigerator regulated to 18°C.&amp;nbsp; The spectrophotometers were connected to a portable computer with custom software that monitors and records absorbances and sample information. The encased water bath had a lid with openings for A&lt;sub&gt;T&lt;/sub&gt; sample input, CO&lt;sub&gt;2&lt;/sub&gt; gas tubing, and two Luer lock ports for pH sample input and output.&lt;/p&gt; &lt;p&gt;The submerged pH channel was affixed to the bottom of the case. The pH optical cell consisted of a gas impermeable PEEK tubing (1/8 in OD, 1/16 in ID) with T-connectors on either side to control sample throughput and extend fiber-optical leads within the cell.&lt;/p&gt; &lt;p&gt;The pH and A&lt;sub&gt;T&lt;/sub&gt; of porewater samples were measured using the mvMICA (see section 3.2). Small-volume spectrophotometric A&lt;sub&gt;T&lt;/sub&gt; measurements were made by directly purging the sample with CO&lt;sub&gt;2&lt;/sub&gt; gas (Fleger et al., in prep) and monitoring the absorbances until equilibration was reached.&lt;/p&gt; &lt;p&gt;A semi-micro disposable cuvette has a small volume whereby 1 mL of sample fills the cell to more than 50% of the cell height. A mounted cuvette holder secured the A&lt;sub&gt;T&lt;/sub&gt; cuvette inside the mvMICA. The holder was positioned so that the top of the cuvette (∼0.5 cm) was above the water bath level, but sample volume remained equilibrated to bath temperature. Optical fibers are positioned just above the bottom of the cuvette. The purging tube assembly includes a CO&lt;sub&gt;2&lt;/sub&gt; equilibration tube that fits into the cuvette cover and is secured to control the positioning of the purging tube without obstructing the light path. Before purging the sample, water-saturated 10% CO&lt;sub&gt;2&lt;/sub&gt; gas was pre-equilibrated to 20°C by passing through a two-meter-long copper coil immersed in a thermostated water bath.&lt;/p&gt; &lt;p&gt;DIC and d&lt;sup&gt;13&lt;/sup&gt;C of DIC were analyzed with a Picarro Cavity Ring-Down Spectrometer (G2131-i) with Liaison autosampler.&lt;/p&gt; &lt;p&gt;Porewater dissolved manganese [Mn] was analyzed by ICP-MS (inductively coupled plasma - mass spectrometry) using an Agilent 8800 triple-quadrupole instrument.&lt;/p&gt; &lt;p&gt;Porewater calcium, strontium, and sodium were measured using a Thermo iCap7600 ICP-OES (inductively coupled plasma - optical emission spectrometer).&lt;/p&gt; &lt;p&gt;Porewater silica was measured on a spectrophotometer.&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1834475 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1834475 completed Jess F. Adkins California Institute of Technology 626-395-8550 MC 100-23, 1200 E. California Blvd Pasadena CA 91125 USA jess@gps.caltech.edu pointOfContact William M. Berelson University of Southern California 310-804-8981 Department of Earth Sciences (ZHS 227) 3651 Trousdale Pky. Los Angeles CA 90089-0740 USA berelson@usc.edu pointOfContact Robert Byrne University of South Florida 727-553-1508 140 Seventh Ave. South St. Petersburg Florida 33701 USA rhbyrne@usf.edu pointOfContact Sijia Dong California Institute of Technology 213-359-9725 1200 E California Blvd. MC 131-24 Pasadena CA 91125 USA sijiadong@nju.edu.cn pointOfContact Andrew Jacobson Northwestern University adj@northwestern.edu pointOfContact Xuewu Liu University of South Florida (727)553-3922 140 7th Avenue S. St. Petersburg FL 33701 USA xwliu@usf.edu pointOfContact Frank J. Pavia California Institute of Technology 1503 NE Boat Street Box 357940 Seattle Washington 98195-7940 USA fjpavia@uw.edu pointOfContact Anna Waldeck Northwestern University a.waldeck@psu.edu pointOfContact asNeeded Dataset Version: 2 Unknown Station Deployment Date Latitude Longitude Sample_ID Water_Column_Depth Sediment_Depth Alkalinity pH Silica DIC d13C_DIC Manganese Calcium Strontium Omega_calcite Thermo iCap7600 ICP-OES minimal volume Multiparameter-Inorganic Carbon Analyzer custom tungsten halogen light source and Ocean Optics USB4000 spectrophotometer theme None, User defined station deployment number date latitude longitude sample identification depth_w depth core total alkalinity (TA) pH silica dissolved inorganic Carbon 13C to 12C ratio in DIC Manganese Calcium Strontium Calcite Saturation State featureType BCO-DMO Standard Parameters Inductively Coupled Plasma Mass Spectrometer Inductively Coupled Plasma Optical Emission Spectrometer Multi-parameter Inorganic Carbon Analyzer Spectrophotometer Spectrophotometer instrument BCO-DMO Standard Instruments SR2113 service Deployment Activity Cocos Ridge, Eastern Equatorial Pacific 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: New approaches to study calcium carbonate dissolution on the sea floor and its impact on paleo-proxy interpretations https://osprey.bco-dmo.org/project/917871 Collaborative Research: New approaches to study calcium carbonate dissolution on the sea floor and its impact on paleo-proxy interpretations <p><em>NSF Award Abstract:</em><br /> The uptake of anthropogenic CO2 by the ocean will eventually be mitigated by the dissolution of CaCO3 on the sea floor. Dissolution is an important component of the carbon cycle in models used for climate projections though the relative importance of where it occurs (water column versus sediments) and the rates and processes involved are not fully understood. This ambitious field and laboratory study is designed to advance our knowledge of the important factors that control carbonate dissolution/ preservation in deep ocean sediments. Using a novel tracer approach and multiple in situ sampling strategies, the project will investigate sea floor dissolution rates, their kinetic controlling factors, the depth in sediments at which dissolution occurs, the role that oxidation of particulate organic carbon plays, and the ramifications of solid phase alteration for the use of geochemically-based paleoceanographic proxies. The project will foster further development of benthic lander technology and yield key information relating sea floor conditions to carbonate dissolution rate, thereby helping to constrain the rate at which the ocean can neutralize the impacts of ocean acidification. Graduate and undergraduate students will be trained and the research team will use film and animation to bring this work to a broader audience through a collaboration with the Los Angeles Natural History Museum.</p> <p>The research team has developed a new approach to quantify calcium carbonate dissolution rates based on 13-C labeled carbonate substrates, a technique which is significantly more sensitive than traditional approaches based on alkalinity and/or calcium measurements. This has opened a range of new opportunities and insights into the governing mechanisms and rates of calcium carbonate dissolution, a challenging and long-standing geochemical problem. Carbonate dissolution rates on the sea floor will be directly assessed by benthic chamber flux measurements of alkalinity and calcium as well as pore water models of TCO2 and alkalinity and their isotopic composition. The potential impacts of organic carbon remineralization will be measured through oxygen and nutrient flux determinations, pore water gradients and modeling. Labeled 13C-enriched calcite will serve as a tracer of near surface dissolution processes when added to benthic chambers and of down-core dissolution processes using 13C-labeled rods inserted into the sediment column. These in situ experiments of labeled carbonate dissolution will be the first of their kind. To complement these measurements, the team will continue development of a rhizon-based pore water sampler that works on a multi-corer at all ocean depths. Field experiments will be conducted at sea at 4-6 sites in a transect through water column supersaturation to undersaturation between Panama and the Galapagos. Dissolution rate measurements, coupled with analyses of cation/Ca ratios in CaCO3 foraminiferal shells will help calibrate the impact of dissolution on paleo-proxy interpretations. Further, analyses of sediment calcite and aragonite fractions will help explain net dissolution and sediment response with time. The results from this study should help to better parameterize sediment variables in ocean-climate models (GCMs), which has important implications for predicting the consequences of ocean acidification and the modeling of paleoceanographic records. The methodologies and new techniques will surely be adopted by other researchers, therefore impacting the larger geochemical community.</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> CDISP 2021 largerWorkCitation project eng; USA oceans Cocos Ridge, Eastern Equatorial Pacific -88.26081 -86.5931 5.16957 6.78465 2021-12-01 2021-12-16 Cocos Ridge, Eastern Equatorial Pacific 0 BCO-DMO catalogue of parameters from In situ porewater data from the Cocos Ridge (Eastern Equatorial Pacific) acquired during cruise SR2113 between November - December 2021 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/946347.rdf Name: Station Units: unitless Description: <p>Station identifier</p> http://lod.bco-dmo.org/id/dataset-parameter/946348.rdf Name: Deployment Units: unitless Description: <p>Deplyment identifier (1 or 2)</p> http://lod.bco-dmo.org/id/dataset-parameter/946349.rdf Name: Date Units: unitless Description: <p>Sampling date in ISO format</p> http://lod.bco-dmo.org/id/dataset-parameter/946350.rdf Name: Latitude Units: decimal degrees Description: <p>Latitude of sampling location, south is negative</p> http://lod.bco-dmo.org/id/dataset-parameter/946351.rdf Name: Longitude Units: decimal degrees Description: <p>Longitude of sampling location, west is negative</p> http://lod.bco-dmo.org/id/dataset-parameter/946352.rdf Name: Sample_ID Units: unitless Description: <p>Sample Identifier</p> http://lod.bco-dmo.org/id/dataset-parameter/946353.rdf Name: Water_Column_Depth Units: meters (m) Description: <p>Water column depth</p> http://lod.bco-dmo.org/id/dataset-parameter/946354.rdf Name: Sediment_Depth Units: centimeters (cm) Description: <p>Sediment depth</p> http://lod.bco-dmo.org/id/dataset-parameter/946355.rdf Name: Alkalinity Units: micromoles per kilogram (umol/kg) Description: <p>Total Alkalinity</p> http://lod.bco-dmo.org/id/dataset-parameter/946356.rdf Name: pH Units: total pH scale Description: <p>pH (in situ, &quot;output&quot; of CO2SYS)</p> http://lod.bco-dmo.org/id/dataset-parameter/946357.rdf Name: Silica Units: micromolar (uM) Description: <p>Silicic acid (H4SiO4)</p> http://lod.bco-dmo.org/id/dataset-parameter/946358.rdf Name: DIC Units: micromoles per kilogram (umol/kg) Description: <p>Dissolved Inorganic Carbon (DIC)</p> http://lod.bco-dmo.org/id/dataset-parameter/946359.rdf Name: d13C_DIC Units: per mil (0/00) Description: <p>delta 13C of DIC</p> http://lod.bco-dmo.org/id/dataset-parameter/946360.rdf Name: Manganese Units: micromoles per kilogram (umol/kg) Description: <p>Mn +2 (Manganese ion concentration)</p> http://lod.bco-dmo.org/id/dataset-parameter/946361.rdf Name: Calcium Units: millimoles per kilogram (mmol/kg) Description: <p>Ca +2 (Calcium ion concentration)</p> http://lod.bco-dmo.org/id/dataset-parameter/946362.rdf Name: Strontium Units: micromoles per kilogram (umol/kg) Description: <p>Sr +2 (Strontium ion concentration)</p> http://lod.bco-dmo.org/id/dataset-parameter/946363.rdf Name: Omega_calcite Units: unitless Description: <p>Omega with respect to calcite, calcite saturation state, calculated with Total Alkalinity and pH</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 22071 https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/922196eb-f989-481c-bf2b-9c55e537bf50/content download 21688 https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/900a5a79-32f6-4a64-aacb-1086c0192f1b/content download https://doi.org/10.26008/1912/bco-dmo.925487.1 download onLine dataset &lt;p&gt;Porewater pH samples were collected in 3-mL capacity gas-tight borosilicate glass syringes with triple O-ring seals. A 2 – 2.5 mL volume was drawn from each coil into a syringe. 1 mL of sample was added to a cuvette for A&lt;sub&gt;T&lt;/sub&gt; measurements and the remaining 1 mL was used for pH measurements. To each sample, 4 &lt;em&gt;μ&lt;/em&gt;L of 2 mM mCP (&lt;em&gt;R &lt;/em&gt;≃ 1.2) was added using a 10 &lt;em&gt;μ&lt;/em&gt;L Eppendorf Research pipette fitted with thin Teflon tubing at the end of the pipette tip. The sample with added dye was capped and thoroughly mixed, then housed in a custom-made cell warmer and thermostatted to 20°C (±0.05 °C). During the sampling process, care was taken to ensure that samples were not exposed to the atmosphere and that there was no entrapment of air bubbles within the syringe.&lt;/p&gt; &lt;p&gt;For small volume total alkalinity (A&lt;sub&gt;T&lt;/sub&gt;) measurements, 1 mL of sample was pipetted directly into a semi-micro cuvette (1-cm pathlength, Fisher Cat 14-955-127) with a syringe or an Eppendorf Research pipette. Samples were covered with a polyethylene cuvette stopper (Cat. S29264) and placed inside a semi-submerged cuvette tray thermostated to a set temperature (e.g., 20°C) in a large-capacity water bath (Lauda Ecoline RE 120 water bath).&lt;/p&gt; &lt;p&gt;DIC and d&lt;sup&gt;13&lt;/sup&gt;C of DIC were analyzed with a Picarro Cavity Ring-Down Spectrometer (G2131-i) with Liaison autosampler; the detailed methodology is described in Subhas et al. (2015). These measurements were made on board the ship. Dickson seawater CRM was used as the standard for DIC; pre-weighed optical calcite powder was used as the standard for d&lt;sup&gt;13&lt;/sup&gt;C. Exetainer vials were pre-acidified and pre-weighed in the lab prior to the cruise. After the vials were filled with 3-5 mL of porewater and analyzed on the cruise, the stored vials were weighed again in the lab to obtain the sample mass. Results using this methodology were corrected by normalizing to measured values of Dickson seawater CRM. Uncertainty (1σ) for replicate DIC and d&lt;sup&gt;13&lt;/sup&gt;C measurements were ±23 µmol/kg and ±0.15‰ (VPDB), respectively. DIC uncertainty was higher than reported in our previous studies (e.g., Subhas et al., 2015) likely due to mass determination: ship-board analysis necessitated weighing after analysis, but there was uncertainty in precisely how much sample mass may be removed during the analysis. Additionally, lower sample volume (5 mLs, instead of 7-8 mLs in our previous studies) may have added error.&lt;/p&gt; &lt;p&gt;Porewater dissolved manganese [Mn] was analyzed at Caltech by ICP-MS (inductively coupled plasma - mass spectrometry) using an Agilent 8800 triple-quadrupole instrument. In situ porewater samples were stored in acid-cleaned HDPE bottles and acidified using 6M distilled HCl. After at least one week, 1 mL aliquots were diluted 10:1 in distilled 5% HNO&lt;sub&gt;3&lt;/sub&gt; for ICP-MS analysis. Concentrations of [Mn] were determined via calibration to multi-element commercial ICP-MS standards, matrix-matched to samples by addition to artificial seawater and diluted in 5% HNO&lt;sub&gt;3&lt;/sub&gt;, identically to the samples. Blanks were assessed by analysis of both pure 5% nitric acid and artificial seawater with no metal standard added. ICP-MS measurements were made in MS/MS mode using He as a carrier gas in the collision cell. The detection limit was 0.03 μmol/kg [Mn].&lt;/p&gt; &lt;p&gt;Porewater calcium, strontium, and sodium were measured at Northwestern University using a Thermo iCap7600 ICP-OES (inductively coupled plasma - optical emission spectrometer). In order to capture signals from high- to low-abundance cations ([Na] and [Sr], respectively), samples were diluted 1:100, by mass, with trace metal clean 3% HNO&lt;sub&gt;3&lt;/sub&gt;. Each sample was weighed, diluted, and analyzed in five replicates. Samples were run in randomized order to account for any instrumental drift not corrected through standard bracketing. Cation concentrations were based on counts per second using two wavelengths from each cation (Ca393.366, Ca396.847, Sr407.771, Sr421.552, Na588.995, and Na589.592 nm). The two wavelengths for each element produced virtually identical results but were averaged, nonetheless. Calibration standards were synthetic mixtures of 1000 ppm cation solutions (Mg, Sr, Na, Ca, and K) diluted in 5% HNO&lt;sub&gt;3&lt;/sub&gt; to match expected sample concentrations. Calibration standards were used to correct for instrumental drift within a single run by interpolating between standards run at the beginning and end of the run. Blank measurements were made on HNO&lt;sub&gt;3 &lt;/sub&gt;and were included in the calibration curve to account for instrumental blank. IAPSO standard seawater was used to adjust for drift across multiple days. Between 3-8 IAPSO standards were measured every run; the IAPSO average in a single run was normalized to the IAPSO average for all runs. This normalization was applied to all porewater samples. In this manner, samples analyzed on different days were normalized to a single measured IAPSO average. [Ca] and [Sr] were normalized to [Na]; all stations had a CTD measured salinity of 34.6 ppt; salinity was converted to [Na] using a seawater Na:salinity ratio of 10.781 g/kg:35 ppt (Pilson, 1998). IAPSO seawater measurements had the following one standard error spreads: ± 0.026 mmol/kg Ca, ± 0.56 μmol/kg Sr, and 1.5 mmol/kg Na.&lt;/p&gt; &lt;p&gt;Porewater silica was measured at USC. A spectrophotometric molybdenum blue method, modified from&amp;nbsp;Parsons et al. (1984), was used to determine the concentration of silicic acid (H4SiO4 or DSi) in the pore water samples. Filtered pore water samples collected on the cruise were stored at 4°C and transported back to USC for analysis. Standards were made via dilution of 1,000 ppm Si standard solution (Aqua Solutions) in DSi free artificial seawater. The precision of this method, determined by duplicate analyses, was 1.3% for samples with DSi concentrations &amp;gt; 20 µM (&amp;lt; 20 µM analytical precision = 13.1%).&amp;nbsp;&lt;/p&gt; &lt;p&gt;Instruments:&lt;/p&gt; &lt;p&gt;The pH and total alkalinity (A&lt;sub&gt;T&lt;/sub&gt;) of porewater samples were measured using a multiparameter CO&lt;sub&gt;2&lt;/sub&gt; instrument named mvMICA (&lt;u&gt;m&lt;/u&gt;inimal &lt;u&gt;v&lt;/u&gt;olume &lt;u&gt;M&lt;/u&gt;ultiparameter-&lt;u&gt;I&lt;/u&gt;norganic &lt;u&gt;C&lt;/u&gt;arbon &lt;u&gt;A&lt;/u&gt;nalyzer). The mvMICA is a dual parameter system engineered to simultaneously measure A&lt;sub&gt;T&lt;/sub&gt; with sample volumes as low as 0.5 mL and pH with 1 and 1.5 mL (Fleger et al., &lt;em&gt;in prep&lt;/em&gt;). The mvMICA configuration consisted of pH and A&lt;sub&gt;T&lt;/sub&gt; channels encased in a thermoregulating water bath. Optical fibers connected channels to a custom tungsten halogen light source and Ocean Optics USB4000 spectrophotometers. Spectrophotometers were housed in a small refrigerator regulated to 18°C.&amp;nbsp; The spectrophotometers were connected to a portable computer with custom software that monitors and records absorbances and sample information. The encased water bath had a lid with openings for A&lt;sub&gt;T&lt;/sub&gt; sample input, CO&lt;sub&gt;2&lt;/sub&gt; gas tubing, and two Luer lock ports for pH sample input and output.&lt;/p&gt; &lt;p&gt;The submerged pH channel was affixed to the bottom of the case. The pH optical cell consisted of a gas impermeable PEEK tubing (1/8 in OD, 1/16 in ID) with T-connectors on either side to control sample throughput and extend fiber-optical leads within the cell.&lt;/p&gt; &lt;p&gt;The pH and A&lt;sub&gt;T&lt;/sub&gt; of porewater samples were measured using the mvMICA (see section 3.2). Small-volume spectrophotometric A&lt;sub&gt;T&lt;/sub&gt; measurements were made by directly purging the sample with CO&lt;sub&gt;2&lt;/sub&gt; gas (Fleger et al., in prep) and monitoring the absorbances until equilibration was reached.&lt;/p&gt; &lt;p&gt;A semi-micro disposable cuvette has a small volume whereby 1 mL of sample fills the cell to more than 50% of the cell height. A mounted cuvette holder secured the A&lt;sub&gt;T&lt;/sub&gt; cuvette inside the mvMICA. The holder was positioned so that the top of the cuvette (∼0.5 cm) was above the water bath level, but sample volume remained equilibrated to bath temperature. Optical fibers are positioned just above the bottom of the cuvette. The purging tube assembly includes a CO&lt;sub&gt;2&lt;/sub&gt; equilibration tube that fits into the cuvette cover and is secured to control the positioning of the purging tube without obstructing the light path. Before purging the sample, water-saturated 10% CO&lt;sub&gt;2&lt;/sub&gt; gas was pre-equilibrated to 20°C by passing through a two-meter-long copper coil immersed in a thermostated water bath.&lt;/p&gt; &lt;p&gt;DIC and d&lt;sup&gt;13&lt;/sup&gt;C of DIC were analyzed with a Picarro Cavity Ring-Down Spectrometer (G2131-i) with Liaison autosampler.&lt;/p&gt; &lt;p&gt;Porewater dissolved manganese [Mn] was analyzed by ICP-MS (inductively coupled plasma - mass spectrometry) using an Agilent 8800 triple-quadrupole instrument.&lt;/p&gt; &lt;p&gt;Porewater calcium, strontium, and sodium were measured using a Thermo iCap7600 ICP-OES (inductively coupled plasma - optical emission spectrometer).&lt;/p&gt; &lt;p&gt;Porewater silica was measured on a spectrophotometer.&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt; Specified by the Principal Investigator(s) &lt;p&gt;Measurements of sample pH made using the mvMICA were made on the total scale (i.e., pH&lt;sub&gt;T&lt;/sub&gt; =&amp;nbsp; – log[H&lt;sub&gt;+&lt;/sub&gt;]&lt;sub&gt;T&lt;/sub&gt;). Spectrophotometric pH was measured using the indicator meta Cresol Purple (mCP).&lt;/p&gt; &lt;p&gt;At the beginning of each set of samples, surface seawater without indicator was injected into the submerged optical cell to obtain a reference spectrum. Due to volume limitations, fresh surface seawater collected from the ship’s underway system was used as a reference, as it had properties similar to porewater samples. After a reference spectrum was taken, a syringe with sample and dye was quickly mixed and injected into the pH cell through the Luer lock port of the pH channel. The input port was checked for bubbles before sample injection to prevent bubble entrapment. The exit port, a two-way Luer shutoff valve, was closed immediately after sample injection. After thermal equilibration of the sample was reached (usually 1 minute), the signal stabilized, and absorbance measurements were obtained at 434, 578, and 730 nm. The pH&lt;sub&gt;T&lt;/sub&gt; was calculated according to Müller and Rehder (2018).&lt;/p&gt; &lt;p&gt;Measurements made using the mvMICA were conducted at 20℃. A Fisher Scientific Traceable Digital Thermometer (±0.05℃) monitored the water bath temperature. The bottom water salinity was measured by the CTD for each station and used in calculations as sample salinity.&lt;/p&gt; &lt;p&gt;Duplicate pH samples were collected at each station. Replicate pH measurements of fill water had an average standard deviation of 0.0023 (&lt;em&gt;N&lt;/em&gt; = 8). The measurement of pH is calibration-free. With the small sample volume measurements, dye perturbation was not considered. All absorbance measurements were tentatively flagged if the baseline shifted more than 0.005 absorbance units or if there were visible signal issues. Absorbance values were saved so that the quality criteria could be evaluated in the future. In the data set, pH&lt;sub&gt;T&lt;/sub&gt; measurements were reported along with their associated quality-control flags. The pH&lt;sub&gt;T&lt;/sub&gt; was reported at the measurement temperature of 20ºC.&lt;/p&gt; &lt;p&gt;Sample A&lt;sub&gt;T&lt;/sub&gt; was measured spectrophotometrically after equilibrating with CO&lt;sub&gt;2 &lt;/sub&gt;gas using bromocresol purple (BCP) as indicator dye. Samples were inserted into the 1-cm cuvette holder partially submerged inside the mvMICA. After the lid was closed, a reference (baseline) spectrum was obtained. Absorbances were measured using at λ&lt;sub&gt;1&lt;/sub&gt; = 432 nm and λ&lt;sub&gt;2&lt;/sub&gt; =589 nm, and an additional wavelength of λ&lt;sub&gt;3&lt;/sub&gt; = 700 nm to correct for baseline changes. 10 &lt;em&gt;μ&lt;/em&gt;L of 2 mM BCP stock solution (&lt;em&gt;R&lt;/em&gt; ≃ 1) was added to the cuvette with an Eppendorf pipette.&lt;/p&gt; &lt;p&gt;The cuvette cover with its attached CO&lt;sub&gt;2&lt;/sub&gt; equilibration tube and vent port cutouts was placed on the cuvette, and CO&lt;sub&gt;2&lt;/sub&gt; bubbling was initiated. The CO&lt;sub&gt;2&lt;/sub&gt; concentration used in A&lt;sub&gt;T &lt;/sub&gt;measurements for this cruise was measured to be 20% using an onboard Picarro Cavity Ring-Down Spectrometer (G2131-i) with a Liaison autosampler. CO&lt;sub&gt;2&lt;/sub&gt; was bubbled through the upper portion of the spectrophotometric cell while absorbance measurements were monitored. Once stabilized (∼ 4 minutes), &lt;em&gt;R&lt;/em&gt; was recorded along with temperature and sample information. BCP absorbance ratios are then used to calculate A&lt;sub&gt;T&lt;/sub&gt; (μmol kg&lt;sup&gt;-1&lt;/sup&gt;) using the equation:&lt;/p&gt; &lt;p&gt;log(A_T + [H+]_T) = log(K_0 · K’_1) + E + pH_T&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; (4.1)&lt;/p&gt; &lt;p&gt;where pH&lt;sub&gt;T&lt;/sub&gt; = –log[H&lt;sup&gt;+&lt;/sup&gt;]&lt;sub&gt;T&lt;/sub&gt; on the total pH scale and is measured spectrophotometrically using Eqs. (2.3) and (2.4) (Clayton and Byrne, 1993; Liu et al., 2011; Hudson-Heck et al., 2021).&lt;/p&gt; &lt;p&gt;The &lt;em&gt;K&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt; term in Eq. 4.1 is the Henry’s law constant (&lt;em&gt;K&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt;), which is calculated as a function of temperature and salinity as 273.15 ≤ &lt;em&gt;T&lt;/em&gt; ≤ 313.15 K and 0 ≤ &lt;em&gt;S&lt;/em&gt; ≤ 40 (Weiss, 1974, Millero, 1995)&lt;/p&gt; &lt;p&gt;ln(K_0) = -60.2409 + 93.4517(100/T) + 23.3585·ln(T/100) + S[0.023517 – 0.023656(T/100) + 0.0047036(T/100)^2]&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; (4.4)&lt;/p&gt; &lt;p&gt;The dissociation constant of carbonic acid, &lt;img src=&quot;///C:/Users/ksoenen/AppData/Local/Packages/oice_16_974fa576_32c1d314_322a/AC/Temp/msohtmlclip1/01/clip_image004.png&quot; /&gt;, is calculated using the characterization of Roy et al. (1993) (5 ≤ &lt;em&gt;S&lt;/em&gt; ≤ 45 and 273.15 ≤ &lt;em&gt;T&lt;/em&gt; ≤ 318.15 K).&lt;/p&gt; &lt;p&gt;ln(K’_1) = 2.83655 – 2307.1266/T – 1.5529423·ln(T) + (-0.20760841 – 4.0484/T) · S^0.5 + 0.08468345S – 0.00654208S^1.5 + ln(1-0.001005S)&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; (4.5)&lt;/p&gt; &lt;p&gt;E is a temperature-dependent empirical constant that includes known constants and the fugacity of CO&lt;sub&gt;2 &lt;/sub&gt;(&lt;em&gt;f&lt;/em&gt;CO&lt;sub&gt;2&lt;/sub&gt;). The constant is determined by measuring the absorbances of a certified reference material (CRM) after equilibration with CO&lt;sub&gt;2&lt;/sub&gt;. The procedure for determining E is outlined in section 4.4.&lt;/p&gt; &lt;p&gt;The calibration constant, E, in Eq. (4.1) was determined using a standard CRM with a well-characterized A&lt;sub&gt;T &lt;/sub&gt;(Batch # 197). 1 mL of CRM was pipetted into a 1-cm pathlength cuvette. The same measurement procedure outlined in section 4.3 was followed. After equilibration, absorbance ratios were used with the known A&lt;sub&gt;T&lt;/sub&gt; value of the CRM to calculate E using the equation:&lt;/p&gt; &lt;p&gt;E = log(A_T + [H+]_T) – log(K’_1·K_0) – pH_T&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; (4.6)&lt;/p&gt; &lt;p&gt;The calibration constant, E, was determined to be -1.180 with a standard deviation of 0.003 (&lt;em&gt;N&lt;/em&gt; = 54).&lt;/p&gt; &lt;p&gt;The A&lt;sub&gt;T&lt;/sub&gt; of CRMs was measured using the mvMICA at the beginning and end of each set and after every 10 – 15 samples to monitor instrument performance and check the calibration constant. The calibration constant, E, was determined at the start of each sample set and used in Eq (4.1) to calculate sample A&lt;sub&gt;T&lt;/sub&gt;. The average A&lt;sub&gt;T&lt;/sub&gt; of CRM batch #197 (Salinity = 33.529; certified A&lt;sub&gt;T&lt;/sub&gt; value: 2256.77 ± 0.90 μmol kg&lt;sup&gt;-1&lt;/sup&gt;) using the average calibration constant (-1.180 ±0.003) was measured to be 2256.81 ± 13.87 μmol kg&lt;sup&gt;-1&lt;/sup&gt; (&lt;em&gt;N&lt;/em&gt; = 54).&lt;/p&gt; &lt;p&gt;Duplicate samples were collected at each station. All absorbance measurements were tentatively flagged if the baseline shifted more than 0.005 absorbance units or if there were visible signal issues. Absorbance values were saved so that the quality criteria could be evaluated in the future. A&lt;sub&gt;T&lt;/sub&gt; measurements and associated quality-control flags were reported in the data set. The A&lt;sub&gt;T&lt;/sub&gt; was reported at the measurement temperature of 20ºC.&lt;/p&gt; &lt;p&gt;Omega_calcite was calculated from pH and Total Alkalinity using CO2SYS (MATLAB v3.1.1) (Lewis and Wallace, 1998), using the total pH scale and K1, K2 constants from Hansson (1972, 1973) and Mehrbach et al. (1973), refit by Dickson and Millero (1987).&lt;/p&gt; Specified by the Principal Investigator(s) * Added latitude, longitude and date to the dataset * Version 2: Updated the dataset that had erroneous d13C data points and lat/lon locations. (requested by submitter). Updated the lat/lon and date on landing page to reflect updated locations. Updated parameter names to align with new dataset. 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 PI Supplied Instrument Name: PI Supplied Instrument Description:Porewater dissolved manganese [Mn] was analyzed by ICP-MS (inductively coupled plasma - mass spectrometry) using an Agilent 8800 triple-quadrupole instrument. Instrument Name: Inductively Coupled Plasma Mass Spectrometer Instrument Short Name:ICP Mass Spec Instrument Description: An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/ Thermo iCap7600 ICP-OES Thermo iCap7600 ICP-OES PI Supplied Instrument Name: Thermo iCap7600 ICP-OES PI Supplied Instrument Description:Porewater calcium, strontium, and sodium were measured using a Thermo iCap7600 ICP-OES (inductively coupled plasma - optical emission spectrometer). Instrument Name: Inductively Coupled Plasma Optical Emission Spectrometer Instrument Short Name:ICP-OES or ICP-AES Instrument Description: Also referred to as an Inductively coupled plasma atomic emission spectroscope (ICP-AES). These instruments pass nebulised samples into an inductively-coupled gas plasma (8-10000 K) where they are atomised and excited. The de-excitation optical emissions at characteristic wavelengths are spectroscopically analysed. It is often used in the detection of trace metals. minimal volume Multiparameter-Inorganic Carbon Analyzer minimal volume Multiparameter-Inorganic Carbon Analyzer PI Supplied Instrument Name: minimal volume Multiparameter-Inorganic Carbon Analyzer PI Supplied Instrument Description:Multiparameter CO2 instrument named mvMICA (minimal volume Multiparameter-Inorganic Carbon Analyzer). The mvMICA is a dual parameter system engineered to simultaneously measure AT with sample volumes as low as 0.5 mL and pH with 1 and 1.5 mL. The mvMICA configuration consisted of pH and AT channels encased in a thermoregulating water bath. Instrument Name: Multi-parameter Inorganic Carbon Analyzer Instrument Short Name:MICA Instrument Description: The Multi-parameter Inorganic Carbon Analyzer (MICA) developed in the USF/College of Marine Science is an autonomous multi-parameter flow-through CO2 system capable of simultaneously measuring pH, carbon dioxide fugacity (fCO2), atmospheric carbon dioxide partial pressure (pCO2), and the total dissolved inorganic carbon (DIC) of natural water. Multiparameter Inorganic Carbon Analyzer (MICA) custom tungsten halogen light source and Ocean Optics USB4000 spectrophotometer custom tungsten halogen light source and Ocean Optics USB4000 spectrophotometer PI Supplied Instrument Name: custom tungsten halogen light source and Ocean Optics USB4000 spectrophotometer PI Supplied Instrument Description:Optical fibers connected channels to a custom tungsten halogen light source and Ocean Optics USB4000 spectrophotometers. Spectrophotometers were housed in a small refrigerator regulated to 18°C.  The spectrophotometers were connected to a portable computer with custom software that monitors and records absorbances and sample information. The encased water bath had a lid with openings for AT sample input, CO2 gas tubing, and two Luer lock ports for pH sample input and output. 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/ PI Supplied Instrument Name: PI Supplied Instrument Description:Picarro Cavity Ring-Down Spectrometer (G2131-i) with Liaison autosampler. 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/ Cruise: SR2113 SR2113 R/V Sally Ride Community Standard Description International Council for the Exploration of the Sea R/V Sally Ride vessel SR2113 Jess F. Adkins California Institute of Technology R/V Sally Ride Community Standard Description International Council for the Exploration of the Sea R/V Sally Ride vessel