Dataset Overview | National Centers for Environmental Information (NCEI)

Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard R/V THOMAS G. THOMPSON cruise TT9306 along World Ocean Circulation Experiment (WOCE) section P14N from 1993-07-05 to 1993-08-11 (NCEI Accession 0206331)

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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 TT9306 on World Ocean Circulation Experiment (WOCE) section P14N from 1993-07-05 to 1993-08-11. 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.
  • Cite as: Hacker, Peter; Firing, Eric (2019). Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard R/V THOMAS G. THOMPSON cruise TT9306 along World Ocean Circulation Experiment (WOCE) section P14N from 1993-07-05 to 1993-08-11 (NCEI Accession 0206331). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0206331. Accessed [date].
gov.noaa.nodc:0206331
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Distribution Formats
  • netCDF-3
    • File Specification: classic
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Distributor NOAA National Centers for Environmental Information
NCEI.Info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Time Period 1993-07-07 to 1994-07-24
Spatial Bounding Box Coordinates
N: 59.00174
S: 15.00127
E: -173.98951
W: 178.97289
Spatial Coverage Map
General Documentation
Associated Resources
  • Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard various cruises of the World Ocean Circulation Experiment (WOCE) project from 1991 to 1997
    • NCEI Collection
      Navigate directly to the URL for data access and direct download.
  • Ocean currents measured by Shipboard Acoustic Doppler Current Profilers (SADCP) from global oceans as part of the Joint Archive (JASADCP) (NCEI Accession 0001206)
  • Parent ID (indicates this dataset is related to other data):
    • gov.noaa.nodc:WOCE-LADCP
Publication Dates
  • publication: 2019-11-02
Data Presentation Form Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status Complete - production of the data has been completed
Historical archive - data has been stored in an offline storage facility
Data Update Frequency As needed
Supplemental Information
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.
Purpose This dataset is available to the public for a wide variety of uses including scientific research and analysis.
Use Limitations
  • accessLevel: Public
  • 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.
Dataset Citation
  • Cite as: Hacker, Peter; Firing, Eric (2019). Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard R/V THOMAS G. THOMPSON cruise TT9306 along World Ocean Circulation Experiment (WOCE) section P14N from 1993-07-05 to 1993-08-11 (NCEI Accession 0206331). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0206331. Accessed [date].
Cited Authors
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Theme keywords NODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Cruise ID
  • tt9306
EXPOCODE
  • 325023_1
Global Change Master Directory (GCMD) Science Keywords WOCE Section
  • P14N
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS
Platform keywords NODC PLATFORM NAMES THESAURUS ICES/SeaDataNet Ship Codes
Instrument keywords NODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords
Place keywords NODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords
Project keywords NODC PROJECT NAMES THESAURUS Global Change Master Directory (GCMD) Project Keywords
Keywords NCEI ACCESSION NUMBER
Use Constraints
  • Cite as: Hacker, Peter; Firing, Eric (2019). Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard R/V THOMAS G. THOMPSON cruise TT9306 along World Ocean Circulation Experiment (WOCE) section P14N from 1993-07-05 to 1993-08-11 (NCEI Accession 0206331). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0206331. Accessed [date].
Access Constraints
  • 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.
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.
Lineage information for: dataset
Processing Steps
  • 2019-11-02T10:07:01Z - NCEI Accession 0206331 v1.1 was published.
Output Datasets
Acquisition Information (collection)
Instrument
  • ADCP
Platform
  • R/V THOMAS G. THOMPSON
Last Modified: 2020-06-15T10:50:13Z
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