Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard R/V THOMAS G. THOMPSON cruise TN191_Leg2 along U.S. Climate Variability and Predictability Research Program (CLIVAR) section P16N from 2006-03-10 to 2006-03-30 (NCEI Accession 0204826)


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            title:  Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard R/V THOMAS G. THOMPSON cruise TN191_Leg2 along U.S. Climate Variability and Predictability Research Program (CLIVAR) section P16N from 2006-03-10 to 2006-03-30 (NCEI Accession 0204826)
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                  Anchor:  https://www.nodc.noaa.gov/cgi-bin/OAS/prd/person/details/4796 Julia M. Hummon
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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 R/V THOMAS G. THOMPSON for cruise TN191_Leg2 on U.S. Climate Variability and Predictability Research Program (CLIVAR) section P16N from 2006-03-10 to 2006-03-30. 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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              Anchor:  https://vocab.ices.dk/services/pox/GetCodeDetail/SHIPC/3250 THOMAS G. THOMPSON (ICES code: 3250)
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                title:  ICES/SeaDataNet Ship Codes
                date: (inapplicable)
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              Anchor:  https://gcmdservices.gsfc.nasa.gov/kms/concept/5488b1cc-08b2-41cf-9bd2-4a2cdd0990de OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN
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              Anchor:  https://gcmdservices.gsfc.nasa.gov/kms/concept/9972bea3-3817-44e8-9c14-bcda7750d820 OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA
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                title:  Global Change Master Directory (GCMD) Location Keywords
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                    date:  2019-11-12
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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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            otherConstraints:  Cite as: Thurnherr, Andreas (2019). Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard R/V THOMAS G. THOMPSON cruise TN191_Leg2 along U.S. Climate Variability and Predictability Research Program (CLIVAR) section P16N from 2006-03-10 to 2006-03-30 (NCEI Accession 0204826). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0204826. Accessed [date].
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                title:  Ocean currents from lowered acoustic Doppler current profilers (LADCP) from the Climate Variability (CLIVAR) project from 2003 to 2014 assembled at the University of Hawaii and Lamont-Doherty Earth Observatory, Columbia University
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                    date:  2019-10-02
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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 0036863)
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                            linkage: https://accession.nodc.noaa.gov/0036863/data/0-data/codas/01065
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                      Anchor:  https://www.nodc.noaa.gov/cgi-bin/OAS/prd/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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                title:  Ocean currents measured by Shipboard Acoustic Doppler Current Profilers (SADCP) from global oceans as part of the Joint Archive (JASADCP) (NCEI Accession 0036863)
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                      Anchor:  https://www.nodc.noaa.gov/cgi-bin/OAS/prd/institution/details/1730 US DOC; NOAA; NESDIS; National Centers for Environmental Information (NCEI)
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                            country:  USA
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                otherCitationDetails:  The processed version of the ADCP data set contained within this accession.
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                westBoundLongitude:  -153.2201
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                    beginPosition:  2006-03-12
                    endPosition:  2006-03-30
        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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                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/0204826
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                description:  NCEI Accession 0204826 v1.1 was published.
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                  DateTime:  2019-10-10T15:46:15Z
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                        title:  NCEI Accession 0204826 v1.1
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                                    description:  published 2019-10-10T15:46:15Z
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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:  CTD
            type:  CTD
            description:  Conductivity-Temperature-Depth probe
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  R/V THOMAS G. THOMPSON
            description:  Use this platform for data attributed to R/V Thomas G. Thompson that were collected between July 1991 and present. R/V Thomas G. Thompson (AGOR-23) Owned by US Navy, leased to University of Washington. Active dates: July 1991 (Source: http://www.navsource.org/archives/09/57/5723.htm, last accessed on 20 Dec 2011)
            instrument: (missing)