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Concentration measurements of water column phosphate, nitrate and nitrite, dissolved organic phosphorus, methane, and ethylene from samples collected during the R/V Neil Armstrong cruise AR16 in the western North Atlantic Ocean in May 2017 (NCEI Accession 0278119)


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            title:  Concentration measurements of water column phosphate, nitrate and nitrite, dissolved organic phosphorus, methane, and ethylene from samples collected during the R/V Neil Armstrong cruise AR16 in the western North Atlantic Ocean in May 2017 (NCEI Accession 0278119)
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                date:  2023-05-13
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                  Anchor:  http://lod.bco-dmo.org/id/person/50621 Daniel J. Repeta
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/742 Woods Hole Oceanographic Institution (WHOI)
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        abstract:  This dataset contains chemical data collected on R/V Neil Armstrong during cruise AR16 in the North Atlantic Ocean from 2017-05-04 to 2017-05-20. These data include Total Dissolved Phosphorus, depth, methane, nitrate plus nitrite, and reactive phosphorus (PO4). The instruments used to collect these data include Chemiluminescence NOx Analyzer, Flame Ionization Detector, Gas Chromatograph, Niskin bottle, and Seal Analytical AutoAnalyser 3HR. These data were collected by David M. Karl of University of Hawaii at Manoa and Daniel J. Repeta of Woods Hole Oceanographic Institution as part of the "Methane, Ethylene, and Dissolved Organic Phosphorus Cycling in the Western North Atlantic Ocean (PHAT)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-07-22. The following is the text of the dataset description provided by BCO-DMO: Dataset Description: Concentration measurements of water column phosphate, nitrate and nitrite, dissolved organic phosphorus, methane, and ethylene from samples collected during the R/V Niel Armstrong cruise AR16 in the western North Atlantic Ocean in May 2017.
        purpose:  This dataset is available to the public for a wide variety of uses including scientific research and analysis.
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          Anchor:  https://www.nsf.gov/awardsearch/showAward?AWD_ID=1634080 Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1634080 Award URL: http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1634080
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                title:  Repeta, D. J., Karl, D. M. (2019) Concentration measurements of water column phosphate, nitrate and nitrite, dissolved organic phosphorus, methane, and ethylene from samples collected during the R/V Neil Armstrong cruise AR16 in the western North Atlantic Ocean in May 2017. Biological and Chemical Oceanography Data Management Office (BCO-DMO). Dataset version 2019-07-19. https://doi.org/10.1575/1912/bco-dmo.769203.2
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        supplementalInformation:  Acquisition Description: Sampling was conducted aboard the R/V Neil Armstrong (cruise AR16) in May 2017. Seawater was collected from Niskin bottles deployed on a rosette with a CTD. Samples for seawater methane (CH4) and ethylene (C2H4) concentration measurements were collected from the CTD rosette in 250 mL glass serum vials (pre-combusted) crimp-sealed with aluminum collars and with Teflon-lined septa. Samples were typically analyzed the same day of sampling aboard the R/V Armstrong with an Agilent 7980A gas chromatograph equipped with a flame ionization detector (FID) and a gas stripping and cryo-trap concentration method as described previously (Repeta et al. 2016). The FID was calibrated by injecting different sized loops of a gas mixture standard containing 10 ppm of CH4 and C2H4 in pure nitrogen gas (Scott-Marrin, Riverside, CA, USA). Samples for nutrient analyses were collected in acid-clean HDPE plastic bottles. Samples were shipped frozen to the Center for Microbial Oceanography: Research and Education at the University of Hawaii at Manoa where they were stored frozen until analysis. Seawater phosphate (PO4) concentrations were determined following the autoanalyzer colorimetric procedure of Foreman et al. (2019). Seawater nitrate+nitrite (NOx) concentrations were determined following the autoanalyzer colorimetric procedure outlined of Foreman et al. (2016). Both PO4 and NOx analyses were performed on a SEAL Analytics autoanalyzer model 3 HR. Seawater samples with low level N+N (LLN) concentrations were measured using the modified chemiluminescent method based on titanium (III) trichloride reduction of N+N to nitric oxide gas and detection with an Antek model 7090 as described by Foreman et al. (2016). MAGIC soluble reactive phosphorus (SRP) concentrations (i.e. phosphate) were determined in seawater samples using the MAGnesium Induced Coprecipitation (MAGIC) technique as described by Karl and Tien (1992) with modifications based on Thompson-Bulldis and Karl (1998) and Cavendar-Bares et al. (2001) to increase the concentration factor of phosphate. Specifically, SRP was concentrated from 150 mL sweater samples using 0.75 mL (0.5% v/v) of 1M NaOH to precipitate Mg(OH)₂ and the Mg(OH)₂ pellets were dissolved with 5.25 mL of 0.1M HCl. Total dissolved P (TDP) concentrations were measured by a photo-oxidation procedure in which controlled exposure to ultraviolet (UV) radiation converts organic P in seawater to phosphate which is then measured by the modified molybdenum blue method adapted for the autoanalyzer technique. The UV photo-oxidation methodology for TDP analysis is described in Foreman et al. (2019). The difference between TDP and PO4 or TDP and SRP is calculated to estimate the concentration of dissolved organic phosphorus (DOP) in seawater.
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            processStep:  (LE_ProcessStep)
                description:  NCEI Accession 0278119 v1.1 was published.
                dateTime:
                  DateTime:  2023-05-13T04:05:31Z
                output:  (LE_Source)
                    sourceCitation:  (CI_Citation)
                        title:  NCEI Accession 0278119 v1.1
                        date:  (CI_Date)
                            date: (inapplicable)
                            dateType:  (CI_DateTypeCode) publication
                        citedResponsibleParty:  (CI_ResponsibleParty)
                            individualName: (inapplicable)
                            contactInfo:  (CI_Contact)
                                onlineResource:  (CI_OnlineResource)
                                    linkage: https://www.ncei.noaa.gov/archive/accession/0278119/1.1
                                    protocol:  HTTPS
                                    name:  NCEI Accession 0278119 v1.1
                                    description:  published 2023-05-13T04:05:31Z
                                    function:  (CI_OnLineFunctionCode) download
                            role: (inapplicable)
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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) asNeeded
        maintenanceNote:  Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
        contact:  (CI_ResponsibleParty)
            organisationName:  NOAA National Centers for Environmental Information
            role:  (CI_RoleCode) custodian
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    acquisitionInformation:  (MI_AcquisitionInformation)
        instrument:  (MI_Instrument)
            identifier:  (MD_Identifier)
                code:  bottle
            type:  bottle
            description:  any type of water bottle sampling device Generic name for water collection device; usually used to determine temperature, salinity and provide water aliquots for measurement of a wide range of parameters; often referred to by a specific type of water sampling bottle, such as a Nansen or Niskin bottle.
        instrument:  (MI_Instrument)
            identifier:  (MD_Identifier)
                code:  chromatograph
            type:  chromatograph
            description:  Gas, ion, liquid or other chromatograph
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  RV Neil Armstrong
            description:  Updated information from ICES for the vessel NEIL ARMSTRONG from US: UNITED STATES. Name : NEIL ARMSTRONG Country(s) : US: UNITED STATES (ISO Country Code) Platform Class : 31: Research vessel Call Sign : WARL MMSI: 338767000 IMO : 9688946 Pennant : AGOR 27 Title : RV Commissioned Date : 2015-09-23 Current Length : 72.5 Built : 2015 Notes : Owned by the US Navy, operated by Woods Hole Oceanographic Institution. Information Sources: - https://www.fleetmon.com/vessels/r-v-neil-armstrong_9688946_9376928/ - http://www.shipspotting.com/gallery/photo.php?lid=1857202 - https://en.wikipedia.org/wiki/RV_Neil_Armstrong_(AGOR-27) Confirmed by NOAA on 2018-10-11 (FY2019).
            instrument: (missing)