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Chemical, current meter, and other data from current meter, bottle, XBT, and CTD casts in the Gulf of Mexico as part of the Northeastern Gulf of Mexico Physical Oceanographic Program: Chemical Oceanography and Hydrography Study (NEGOM) project, 1997-11-16 to 2000-08-08 (NCEI Accession 0000703)


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            title:  Chemical, current meter, and other data from current meter, bottle, XBT, and CTD casts in the Gulf of Mexico as part of the Northeastern Gulf of Mexico Physical Oceanographic Program: Chemical Oceanography and Hydrography Study (NEGOM) project, 1997-11-16 to 2000-08-08 (NCEI Accession 0000703)
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                date:  2002-04-10
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                date:  2022-10-28
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                  Anchor:  NCEI Accession ID 0000703
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1730 NOAA National Centers for Environmental Information
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/person/details/230 Matthew K. Howard
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/981 Texas A&M University (TAMU)
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/person/details/230 Howard, Matthew K.
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/981 Texas A&M University (TAMU)
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        abstract:  Chemical, current meter, and other data were collected using current meter, bottle, XBT, and CTD casts in the Gulf of Mexico from November 16, 1997 to August 8, 2000. Data were submitted by Texas A&M University as part of the Northeastern Gulf of Mexico Physical Oceanographic Program: Chemical Oceanography and Hydrography Study (NEGOM) project. There were nine cruises, all aboard R/V Gyre. The same 11 cross-shelf lines were occupied during each cruise. On each cruise, profiles of temperature, salinity, dissolved oxygen, fluorescence, backscatterance, PAR, and percent transmission were made with a Seabird CTD. Water samples were taken and analyzed for salinity, dissolved oxygen, nutrients, pigments, particulate material, particulate organic carbon and particulate organic nitrogen. Many XBT probes were released. An underway flow-through system measured near-surface temperature, salinity, and fluorescence. Acoustic Doppler current profilers measured vertical profiles of currents while underway.
        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.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1730 NOAA National Centers for Environmental Information
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              Anchor:  https://www.ncei.noaa.gov/archive/accession/0000703 0000703
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                title:  NCEI ACCESSION NUMBER
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                    date:  2002-04-09
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            keyword:
              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/11 AMMONIUM (NH4)
            keyword:
              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/81 CHLOROPHYLL
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/91 CONDUCTIVITY
            keyword:
              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/103 CURRENT METER - EAST-WEST COMPONENT (U)
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/104 CURRENT METER - NORTH-SOUTH COMPONENT (V)
            keyword:
              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/116 DISSOLVED OXYGEN
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/589 HYDROSTATIC PRESSURE
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/223 NITRATE
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/226 NITRITE
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/452 NITROGEN - ORGANIC
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/230 NUTRIENTS
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/251 PARTICULATE ORGANIC CARBON
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/263 phosphate
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/307 SALINITY
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/332 SIGMA-T
            keyword:
              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/333 silicate
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/394 UREA
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/373 WATER TEMPERATURE
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/insttype/details/1 ADCP
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/insttype/details/48 bathythermograph - XBT
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/insttype/details/3 bottle
            keyword:
              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/insttype/details/8 CTD
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/obstype/details/18 profile
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/obstype/details/26 underway
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/platform/details/2917 GYRE
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/981 Texas A&M University
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/981 Texas A&M University
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/project/details/310 Northeastern Gulf of Mexico Physical Oceanographic Program: Chemical Oceanography and Hydrography Study (NEGOM)
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/seaname/details/22 Gulf of Mexico
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            keyword:  oceanography
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/086c68e5-1c94-4f2f-89d5-0453443ff249 DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                            protocol:  HTTPS
                            name:  GCMD Keyword Forum Page
                            description:  Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 17. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords
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            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/6eb3919b-85ce-4988-8b78-9d0018fd8089 EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/64d17528-29b4-4e2e-843a-7f7035bb5717 EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/7989eae1-8ea3-4039-af0c-9130de145449 EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/4fde380a-38c5-4d46-bc80-4f2515a43983 EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/941410da-0b7f-4ec6-a718-212194ced13f EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/db5357c9-cc9d-4693-86fe-6bb88555d434 EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/8dd7c9f0-51d0-4037-b1d0-a2517c1770ad EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/d3055f47-258e-4556-a885-54cd1fff4680 EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC CARBON
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/dd025312-0d27-44e0-ae05-7cfcc1aa17f0 EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/46206e8c-8def-406f-9e62-da4e74633a58 EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/7041e51c-e2de-405a-b154-6016f624f54f EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/007ab607-2ee1-484d-85fb-0bfb89f18c9b EARTH SCIENCE > OCEANS > SALINITY/DENSITY > DENSITY
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/7e95b5fc-1d58-431a-af36-948b29fa870d EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY
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                title:  Global Change Master Directory (GCMD) Science Keywords
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                    date:  2023
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            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/ca8de50f-b795-42b7-9301-8baffe2de0f3 ADCP > Acoustic Doppler Current Profiler
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/01cc0beb-7c9a-40ed-ad86-0661b41aee53 CTD > Conductivity, Temperature, Depth
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/a76dd88f-8a2b-4bd2-867d-5b562b7b4f0d XBT > Expendable Bathythermographs
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                            administrativeArea:  MD
                        onlineResource:  (CI_OnlineResource)
                            linkage: https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
                            protocol:  HTTPS
                            name:  GCMD Keyword Forum Page
                            description:  Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 17. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords
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                    role:  (CI_RoleCode) custodian
        descriptiveKeywords:  (MD_Keywords)
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/1bb21d0f-bf48-42b5-8e09-cc0d58407e4a Ships
            type:  (MD_KeywordTypeCode) platform
            thesaurusName:  (CI_Citation)
                title:  Global Change Master Directory (GCMD) Platform Keywords
                date:  (CI_Date)
                    date:  2023
                    dateType:  (CI_DateTypeCode) revision
                edition:  17
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA)
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                            city:  Greenbelt
                            administrativeArea:  MD
                        onlineResource:  (CI_OnlineResource)
                            linkage: https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
                            protocol:  HTTPS
                            name:  GCMD Keyword Forum Page
                            description:  Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 17. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords
                            function:  (CI_OnLineFunctionCode) information
                    role:  (CI_RoleCode) custodian
        descriptiveKeywords:  (MD_Keywords)
            keyword:
              Anchor:  https://vocab.ices.dk/services/pox/GetCodeDetail/SHIPC/32GY GYRE (ICES code: 32GY)
            type:  (MD_KeywordTypeCode) platform
            thesaurusName:  (CI_Citation)
                title:  ICES/SeaDataNet Ship Codes
                date: (inapplicable)
        descriptiveKeywords:  (MD_Keywords)
            keyword:
              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/75fab119-51a6-4b59-9711-f6c3cd3139db OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MEXICO
            type:  (MD_KeywordTypeCode) place
            thesaurusName:  (CI_Citation)
                title:  Global Change Master Directory (GCMD) Location Keywords
                date:  (CI_Date)
                    date:  2023
                    dateType:  (CI_DateTypeCode) revision
                edition:  17
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA)
                    contactInfo:  (CI_Contact)
                        address:  (CI_Address)
                            city:  Greenbelt
                            administrativeArea:  MD
                        onlineResource:  (CI_OnlineResource)
                            linkage: https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
                            protocol:  HTTPS
                            name:  GCMD Keyword Forum Page
                            description:  Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 17. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords
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            useLimitation:  accessLevel: Public
        resourceConstraints:  (MD_LegalConstraints)
            useConstraints:  (MD_RestrictionCode) otherRestrictions
            otherConstraints:  Cite as: Howard, Matthew K.; Texas A&M University (2002). Chemical, current meter, and other data from current meter, bottle, XBT, and CTD casts in the Gulf of Mexico as part of the Northeastern Gulf of Mexico Physical Oceanographic Program: Chemical Oceanography and Hydrography Study (NEGOM) project, 1997-11-16 to 2000-08-08 (NCEI Accession 0000703). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0000703. Accessed [date].
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            useLimitation:  Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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            accessConstraints:  (MD_RestrictionCode) otherRestrictions
            otherConstraints:  Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
        language:
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                westBoundLongitude:  -94.92
                eastBoundLongitude:  -82.81
                southBoundLatitude:  27.48
                northBoundLatitude:  30.38
            temporalElement:  (EX_TemporalExtent)
                extent:
                  TimePeriod:
                    beginPosition:  1997-11-16
                    endPosition:  2000-08-08
        supplementalInformation: (missing)
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    distributionInfo:  (MD_Distribution)
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                organisationName:
                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1730 NOAA National Centers for Environmental Information
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  +1-301-713-3277
                    address:  (CI_Address)
                        electronicMailAddress:  NCEI.Info@noaa.gov
                role:  (CI_RoleCode) pointOfContact
            distributionOrderProcess:  (MD_StandardOrderProcess)
                fees:  In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
                orderingInstructions:  Contact NCEI for other distribution options and instructions.
            distributorFormat:  (MD_Format)
                name:  Originator data format
                version: (unknown)
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                    protocol:  HTTPS
                    applicationProfile:  Web browser
                    name:  NCEI Dataset Landing Page
                    description:  Navigate directly to the URL for a descriptive web page with download links.
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                    linkage: https://www.ncei.noaa.gov/archive/accession/oas/703
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                    applicationProfile:  Web browser
                    name:  Descriptive Information
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                    function:  (CI_OnLineFunctionCode) download
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                    linkage: ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0001/0000703/
                    protocol:  FTP
                    applicationProfile:  Any FTP client
                    name:  FTP
                    description:  These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).
                    function:  (CI_OnLineFunctionCode) download
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    dataQualityInfo:  (DQ_DataQuality)
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            processStep:  (LE_ProcessStep)
                description:  NCEI Accession 0000703 v1.1 was published.
                dateTime:
                  DateTime:  2002-04-10T19:04:08Z
                output:  (LE_Source)
                    sourceCitation:  (CI_Citation)
                        title:  NCEI Accession 0000703 v1.1
                        date:  (CI_Date)
                            date: (inapplicable)
                            dateType:  (CI_DateTypeCode) publication
                        citedResponsibleParty:  (CI_ResponsibleParty)
                            individualName: (inapplicable)
                            contactInfo:  (CI_Contact)
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                                    linkage: https://www.ncei.noaa.gov/archive/accession/0000703/1.1
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                                    name:  NCEI Accession 0000703 v1.1
                                    description:  published 2002-04-10T19:04:08Z
                                    function:  (CI_OnLineFunctionCode) download
                            role: (inapplicable)
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                description:  NCEI Accession 0000703 was revised and v1.2 was published.
                rationale:  Additional metadata files were received or created for this dataset. These updates were copied into the about/ directory of this accession. These updates may provide additional files or replace obsolete files. This version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession.
                dateTime:
                  DateTime:  2022-01-03T00:46:18Z
                output:  (LE_Source)
                    sourceCitation:  (CI_Citation)
                        title:  NCEI Accession 0000703 v1.2
                        date:  (CI_Date)
                            date: (inapplicable)
                            dateType:  (CI_DateTypeCode) publication
                        citedResponsibleParty:  (CI_ResponsibleParty)
                            individualName: (inapplicable)
                            contactInfo:  (CI_Contact)
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                                    linkage: https://www.ncei.noaa.gov/archive/accession/0000703/1.2
                                    protocol:  HTTPS
                                    name:  NCEI Accession 0000703 v1.2
                                    description:  published 2022-01-03T00:46:18Z
                                    function:  (CI_OnLineFunctionCode) download
                            role: (inapplicable)
            processStep:  (LE_ProcessStep)
                description:  NCEI Accession 0000703 was revised and v1.3 was published.
                rationale:  Additional metadata files were received or created for this dataset. These updates were copied into the about/ directory of this accession. These updates may provide additional files or replace obsolete files. This version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession.
                dateTime:
                  DateTime:  2022-10-28T18:22:25Z
                output:  (LE_Source)
                    sourceCitation:  (CI_Citation)
                        title:  NCEI Accession 0000703 v1.3
                        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/0000703/1.3
                                    protocol:  HTTPS
                                    name:  NCEI Accession 0000703 v1.3
                                    description:  published 2022-10-28T18:22:25Z
                                    function:  (CI_OnLineFunctionCode) download
                            role: (inapplicable)
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) repository
            levelDescription:  (MD_ScopeDescription)
                other:  NOAA National Centers for Environmental Information
        lineage:  (LI_Lineage)
            processStep:  (LE_ProcessStep)
                description:  NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
                dateTime:
                  DateTime:  2015-04-22T00:00:00
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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.
        maintenanceNote:  NCEI Accession 0000703 was revised and a new version of the archival package was published. Updates to existing archival packages may provide additional files or replace obsolete files. The latest version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession. Please see journal.txt in the /about directory for additional details on changes made.
        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:  ADCP
            type:  ADCP
            description:  Acoustic Doppler Current Profiler The Acoustic Doppler Current Profiler (ADCP) measures currents beneath a ship while underway. Sound signals sent from the moving ship bounce back to receivers aboard the ship. This provides a profile of water movement relative to the ship-precise modern navigation, allowing the ship's motion to be subtracted from the data. These devices are also used on moorings and profilers and, along with acoustic backscattering, measure animal biomass. Particles in the path of the sound waves, mostly plankton, reflect a small part of the sound energy back toward receivers, allowing researchers to make remote estimates of the sizes and numbers of animals present in the water column. Before the 1970's, the most technologically advanced instrument used to measure water velocity was known as a Doppler speed log. This evolved into the first commercial ADCP, produced in the mid-1970's, which used averaging. Later in the 1970's, the first vessel-mounted ADCP was developed to measure water velocity more accurately and to allow measurement in range cells over a depth profile. As instruments evolved, so did new techniques in Doppler signal processing. Initially, Doppler speed logs used simple analog signal processing methods, which are still used in some commercial speed logs today. However, the first ADCPs incorporated analog-to-digital signal conversion over a narrow communication bandwidth. Around 1990, this technique was developed into broadband signal processing. Since then, broadband ADCPs have been able to generate very accurate, real-time velocity measurements.
        instrument:  (MI_Instrument)
            identifier:  (MD_Identifier)
                code:  bathythermograph - XBT
            type:  bathythermograph - XBT
            description:  eXpendable BathyThermograph
        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:  CTD
            type:  CTD
            description:  Conductivity-Temperature-Depth probe
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  GYRE
            description:  Flag: United States Vessel Type: Oceanographic Research IMO: 7318999 DOB: 1973-10
            instrument: (missing)