Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard USNS Thomas Washington cruise TW9105 along World Ocean Circulation Experiment (WOCE) section P17C from 1991-05-31 to 1991-07-11 (NCEI Accession 0204130)


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            title:  Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard USNS Thomas Washington cruise TW9105 along World Ocean Circulation Experiment (WOCE) section P17C from 1991-05-31 to 1991-07-11 (NCEI Accession 0204130)
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/person/details/4796 Julia M. Hummon
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/231 University of Hawai'i at Mānoa (UHM)
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/person/details/1933 Mizuki Tsuchiya
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        abstract:  This data set contains the Lowered Acoustic Doppler Current Profile (LADCP) estimates of ocean currents and shear in a profile to deep waters. A raw and a processed version are given in each dataset, both of which include ancillary data streams from CTD, ship navigation, and shipboard ADCP. The data were collected on USNS Thomas Washington for cruise TW9105 on World Ocean Circulation Experiment (WOCE) section P17C from 1991-05-31 to 1991-07-11. This cruise is one of 53 cruises within the NCEI collections WOCE-LADCP and CLIVAR-LADCP. The finalized datasets have been assembled and submitted to NCEI by the University of Hawaii and the Scripps Institution of Oceanography. The originators of each LADCP set are defined within the accession documentation.
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                            description:  The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
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            useLimitation:  accessLevel: Public
        resourceConstraints:  (MD_LegalConstraints)
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            otherConstraints:  Cite as: Hummon, Julia M.; UH Mānoa (2019). Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard USNS Thomas Washington cruise TW9105 along World Ocean Circulation Experiment (WOCE) section P17C from 1991-05-31 to 1991-07-11 (NCEI Accession 0204130). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0204130. Accessed [date].
        resourceConstraints:  (MD_LegalConstraints)
            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.
        resourceConstraints:  (MD_LegalConstraints)
            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.
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                title:  Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard various cruises of the World Ocean Circulation Experiment (WOCE) project from 1991 to 1997
                date:  (CI_Date)
                    date:  2019-10-02
                    dateType:  (CI_DateTypeCode) publication
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                    authority:  (CI_Citation)
                        title:  NOAA National Centers for Environmental Information
                        date: (inapplicable)
                    code:  gov.noaa.nodc:WOCE-LADCP
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                            linkage: https://www.ncei.noaa.gov/archive/accession/WOCE-LADCP
                            protocol:  HTTPS
                            name:  NCEI Collection
                            description:  Navigate directly to the URL for data access and direct download.
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                    organisationName:  NOAA National Centers for Environmental Information
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                title:  Ocean currents measured by Shipboard Acoustic Doppler Current Profilers (SADCP) from global oceans as part of the Joint Archive (JASADCP) (NCEI Accession 0001206)
                date:  (CI_Date)
                    date: (unknown)
                    dateType:  (CI_DateTypeCode) publication
                identifier:  (MD_Identifier)
                    authority:  (CI_Citation)
                        title:  NOAA National Centers for Environmental Information
                        date: (inapplicable)
                    code:  gov.noaa.nodc:0001206
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                    positionName: (unknown)
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                            linkage: https://accession.nodc.noaa.gov/0001206/data/0-data/codas/00019
                            protocol:  HTTPS
                            name:  Online Data for SAC ID 00019
                            description:  Online Data for SAC ID 00019
                            function:  (CI_OnLineFunctionCode) download
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                    organisationName:
                      Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1730 US DOC; NOAA; NESDIS; National Centers for Environmental Information (NCEI)
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                otherCitationDetails:  The processed version of the ADCP data set contained within this accession.
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            initiativeType:  (DS_InitiativeTypeCode) collection
        language:
          LanguageCode:  eng; USA
        characterSet:  (MD_CharacterSetCode) utf8
        topicCategory:  (MD_TopicCategoryCode) environment
        topicCategory:  (MD_TopicCategoryCode) oceans
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                westBoundLongitude:  -135.16196
                eastBoundLongitude:  -134.98201
                southBoundLatitude:  -3.27539
                northBoundLatitude:  2.8297
            temporalElement:  (EX_TemporalExtent)
                extent:
                  TimePeriod:
                    beginPosition:  1991-06-28
                    endPosition:  1991-07-05
        supplementalInformation:  ADCPs use the Doppler shift of an outgoing frequency along a beam to return measured velocity along that beam. ADCPs typically have 4 beams, allowing measurement of velocity in 3 dimensions, in bins of varying distance from the transducer head. In this application, the ADCP is mounted on a CTD rosette frame and lowered along with the rest of the package, hence called Lowered ADCP ("LADCP"). LADCP requires less ship time in estimating deep currents as compared to historic measuring systems such as Pegasus systems. The goal is to determine water velocities to the full depth of the ocean for each LADCP deployment. Ocean velocities are very small (few cm/s), especially in the deep water. The package is typically lowered or raised at 1m/s for much of the water column, creating a challenging data processing situation. To reduce the LADCP measurements, one must utilize other data streams such as CTD at both standard levels and at the highest frequency of recording, GPS positions, ship navigation, ocean depth, and shipboard ADCP. Lowered ADCP data requires ancillary information to improve the processed data product. Over generations, the processing has improved and these ancillary components are systematically collected along with the LADCP data. In older datasets, they may be missing entirely. The directory structure and naming convention for the submitted LADCP datasets (WOCE plus CLIVAR) attempt to rationalize 20 years of data acquisition and processing by a collection of scientists who were inventing the field of LADCP acquisition and processing, so there is some variety in the organization and naming of the original datasets. Evolution of the instrumentation and processing techniques have continued. For the NCEI archive, three levels are defined: 1) Level-0, raw LADCP and ancillary data streams of the down- and up-cast, 2) Level-1, processed LADCP and ancillary data streams for the down-, up-, and averaged cast, and 3) Level-2 science-ready subset of select parameters. Presently only Levels 0 and 1 will be archived since work continues for defining error associated with Level 2. Note, Level 1 data are "as processed" based on the processing code pertinent at that time. There is one processed file per station cast. The ancillary streams of Level-1 are the basic oceanographic variables of interest, and may also include a variety of additional fields associated with the processing.
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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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                        electronicMailAddress:  NCEI.Info@noaa.gov
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                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.
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                    linkage: https://www.ncei.noaa.gov/archive/accession/0204130
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                    linkage: https://www.ncei.noaa.gov/archive/accession/oas/204130
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                    linkage: https://www.ncei.noaa.gov/archive/accession/download/204130
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                    linkage: ftp://ftp.nodc.noaa.gov/nodc/archive/arc0146/0204130/
                    protocol:  FTP
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                    description:  These data are available through the File Transfer Protocol (FTP). You may use any FTP client to download these data.
                    function:  (CI_OnLineFunctionCode) download
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                description:  NCEI Accession 0204130 v1.1 was published.
                dateTime:
                  DateTime:  2019-10-02T16:03:57Z
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                    sourceCitation:  (CI_Citation)
                        title:  NCEI Accession 0204130 v1.1
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                                    linkage: https://www.ncei.noaa.gov/archive/accession/0204130/1.1
                                    protocol:  HTTPS
                                    name:  NCEI Accession 0204130 v1.1
                                    description:  published 2019-10-02T16:03:57Z
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        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:  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.
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  USNS Thomas Washington
            description: https://publishing.cdlib.org/ucpressebooks/view?docId=kt109nc2cj&chunk.id=pt04&toc.depth=1&toc.id=pt04&brand=eschol https://en.wikipedia.org/wiki/USNS_Thomas_Washington_(T-AGOR-10)
            instrument: (missing)