Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard various cruises of the World Ocean Circulation Experiment (WOCE) project from 1991 to 1997

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This collection holds the Lowered Acoustic Doppler Current Profile (LADCP) estimates of ocean currents collected for the World Ocean Circulation Experiment (WOCE) project. LADCPs estimate deep ocean absolute currents and shear. The project has been completed (WOCE ended in 1999).

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 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 3. 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.
  • Cite as: Chereskin, Teresa K.; Firing, Eric; Hacker, Peter; Hummon, Julia M.; Kosro, P. Michael (2019). Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard various cruises of the World Ocean Circulation Experiment (WOCE) project from 1991 to 1997. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://accession.nodc.noaa.gov/WOCE-LADCP. Accessed [date].
gov.noaa.nodc:WOCE-LADCP
Search Data
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    Search for data granules belonging to this collection (a granule is the smallest aggregation of data that can be independently described and retrieved).
Distribution Formats
  • netCDF (Version: netCDF-3)
Ordering Instructions Contact NCEI for other distribution options and instructions.
Distributor DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
301-713-3277
NCEI.Info@noaa.gov
Dataset Point of Contact Information Services
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
301-713-3277
NCEI.Info@noaa.gov
Time Period 1991-05-31 to 1997-11-19
Spatial Bounding Box Coordinates
N: 64.90215
S: -66.99998
E: -9.33458
W: 30.33837
Spatial Coverage Map
General Documentation
  • Dataset Description
    Navigate directly to the URL for a descriptive web page with download links.
Associated Resources
  • E. Firing and R.L. Gordon, 1990. Deep Ocean Acoustic Doppler Current Profiling. In Proceedings of the IEEE Fourth Working Conference on Current Measurements, April 3-5, 1990, Clinton, Maryland, p 192
  • J. Fischer and M. Visbeck, 1993. Deep Velocity Profiling with self-contained ADCPs. J. Atmos. Oceanic Technol. 10:5. p. 764-773
  • Thurnherr, A. M. 2010. A Practical Assessment of the Errors Associated with Full-Depth LADCP Profiles Obtained Using Teledyne RDI Workhorse Acoustic Doppler Current Profilers. J. Atmos. Oceanic Technol. 27:7. p. 1215-1227
  • Visbeck, M. 2002. Deep velocity profiling using Lowered Acoustic Doppler Current Profilers: Bottom track and inverse solutions. J. Atm. Oc. Tech.19, 794-807
  • Ocean currents measured by Shipboard Acoustic Doppler Current Profilers (SADCP) from global oceans as part of the Joint Archive (JASADCP) 1985-06 to 2016-11
Publication Dates
  • publication: 2019-10-02
  • revision: 2019-11-20
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
Purpose Physical oceanographers with need of understanding ocean currents. LADCP provides estimates of deep currents for large scale circulation studies and smaller scale mixing and internal wave investigations.
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.
  • For all but the Level 2 sets, the user is expected to have experience working with ocean current data to understand the limits of application of the LADCP data.
Dataset Citation
  • Cite as: Chereskin, Teresa K.; Firing, Eric; Hacker, Peter; Hummon, Julia M.; Kosro, P. Michael (2019). Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard various cruises of the World Ocean Circulation Experiment (WOCE) project from 1991 to 1997. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://accession.nodc.noaa.gov/WOCE-LADCP. Accessed [date].
Cited Authors
Principal Investigators
Collaborators
Contributors
Resource Providers
Publishers
Theme keywords NODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Cruise ID
  • ds9402
  • ds9403
  • ds9601
  • kn9302
  • kn9412
  • kn9501
  • kn9503
  • kn9504
  • kn9506
  • kn9507
  • kn9509
  • kn9511
  • kn9512
  • kn9611
  • kn9705
  • kn9710
  • tt9305
  • tt9306
  • tt9308
  • tt9310_tn026
  • tt9401b
  • tw9105
  • tw9109
  • vi9210
EXPOCODE
  • 316N138_12
  • 316N145_10
  • 316N145_11
  • 316N145_12
  • 316N145_13
  • 316N145_14 (I02E)
  • 316N145_15 (I02W)
  • 316N145_5
  • 316N145_6
  • 316N145_7
  • 316N145_8
  • 316N145_9
  • 316N147_2
  • 316N151_2
  • 316N154_2
  • 31DSCG94_2
  • 31DSCG94_3
  • 31DSCG96_1
  • 31WTTUNES_1
  • 31WTTUNES_3
  • 3220CGC92_0
  • 3220CGC92_1
  • 3220CGC92_2
  • 3250031_1
  • 325021_1
  • 325023_1
  • 3250TN026_1
Global Change Master Directory (GCMD) Science and Service Keywords WOCE Section
  • A24
  • AR24
  • I01E
  • I01W
  • I02E_I02W
  • I03
  • I04_I05W_I07C
  • I07N
  • I08N_I05E
  • I08S_I09S
  • I09N
  • I10
  • P10
  • P13
  • P14N
  • P14S
  • P15S
  • P16C
  • P17C
  • P17N
  • P18
  • P19C
  • P31
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 Global Change Master Directory (GCMD) Platform Keywords SeaDataNet Ship and Platform 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: Chereskin, Teresa K.; Firing, Eric; Hacker, Peter; Hummon, Julia M.; Kosro, P. Michael (2019). Ocean currents from lowered acoustic Doppler current profilers (LADCP) aboard various cruises of the World Ocean Circulation Experiment (WOCE) project from 1991 to 1997. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://accession.nodc.noaa.gov/WOCE-LADCP. 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: series
Processing Steps
  • 2019-10-02T16:03:57Z - NCEI Accession 0204130 v1.1 was published.
  • 2019-10-28T14:16:41Z - NCEI Accession 0206032 v1.1 was published.
  • 2019-10-30T05:07:46Z - NCEI Accession 0206103 v1.1 was published.
  • 2019-10-30T18:09:28Z - NCEI Accession 0206153 v1.1 was published.
  • 2019-10-31T11:48:06Z - NCEI Accession 0206204 v1.1 was published.
  • 2019-11-01T11:45:28Z - NCEI Accession 0206286 v1.1 was published.
  • 2019-11-02T10:07:01Z - NCEI Accession 0206331 v1.1 was published.
  • 2019-11-03T16:00:56Z - NCEI Accession 0206401 v1.1 was published.
  • 2019-11-04T13:18:09Z - NCEI Accession 0206460 v1.1 was published.
  • 2019-11-05T13:26:16Z - NCEI Accession 0206524 v1.1 was published.
  • 2019-11-06T13:12:38Z - NCEI Accession 0206572 v1.1 was published.
  • 2019-11-07T12:24:14Z - NCEI Accession 0206624 v1.1 was published.
  • 2019-11-09T22:47:43Z - NCEI Accession 0206666 v1.1 was published.
  • 2019-11-10T09:20:04Z - NCEI Accession 0206702 v1.1 was published.
  • 2019-11-10T18:03:56Z - NCEI Accession 0206739 v1.1 was published.
  • 2019-11-11T16:04:15Z - NCEI Accession 0206799 v1.1 was published.
  • 2019-11-12T15:55:14Z - NCEI Accession 0206865 v1.1 was published.
  • 2019-11-13T13:40:45Z - NCEI Accession 0206903 v1.1 was published.
  • 2019-11-14T12:16:43Z - NCEI Accession 0206953 v1.1 was published.
  • 2019-11-15T13:25:55Z - NCEI Accession 0207042 v1.1 was published.
  • 2019-11-16T10:46:27Z - NCEI Accession 0207066 v1.1 was published.
  • 2019-11-17T10:53:00Z - NCEI Accession 0207103 v1.1 was published.
  • 2019-11-18T11:23:05Z - NCEI Accession 0207132 v1.1 was published.
  • 2019-11-19T11:09:12Z - NCEI Accession 0207178 v1.1 was published.
  • 2019-11-20T10:31:08Z - NCEI Accession 0207220 v1.1 was published.
Output Datasets
Acquisition Information (collection)
Instrument
  • ADCP
  • CTD
Platform
  • NOAA Ship Discoverer
  • R/V John V. Vickers
  • R/V Knorr
  • R/V THOMAS G. THOMPSON
  • USNS Thomas Washington
Last Modified: 2020-02-22T02:43:58Z
For questions about the information on this page, please email: NODC.DataOfficer@noaa.gov