Ocean currents from lowered acoustic Doppler current profilers (LADCP) of the cDrake Experiment in the Drake Passage with annual cruises of the RVIB Nathaniel B. Palmer from 2007 to 2011 assembled at the Scripps Institution of Oceanography

Description

This collection holds the lowered Acoustic Doppler Current Profiler (LADCP) data collected from annual cruises within October to December on the RVIB Nathaniel B. Palmer as part of the cDrake Experiment 2007-2011. The goal of cDrake was to quantify the transport and understand the dynamical balances of the Antarctic Circumpolar Current (ACC) in Drake Passage. For this purpose, a transport line and a local dynamics array of Current and Pressure recording Inverted Echo Sounders (CPIES) and current meter moorings were deployed, spanning all of Drake Passage. Annual cruises were made to deploy (NBP0710), obtain data from (NBP0812, NBP0908, NBP1004) and recover (NBP1107) the CPIES. On each cruise, full depth CTD/LADCP profile casts were made for the purpose of calibrating the CPIES. The LADCP provides a full-depth profile of ocean current from a self-contained ADCP mounted on the CTD rosette. Using the conventional "shear method" for processing (Fischer and Visbeck, 1993), overlapping profiles of vertical shear of horizontal velocity are averaged and gridded, to form a full-depth shear profile. The shear profile is integrated vertically to obtain the baroclinic velocity (velocity profile with zero depth-averaged mean value); the unknown integration constant is the depth-averaged or barotropic velocity. This barotropic component is computed as the sum of the time-averaged, measured velocity and the ship drift (minus a small correction, less than 1 cm/s, to account for a nonconstant fall rate). A newer method ("inverse method") improves the calculation by adding additional constraints, such as shipboard ADCP (SADCP) and bottom tracking, to solve for the velocity profile using a linear least squares inverse technique (Visbeck, 2002). Lowered ADCP data makes use of ancillary information to produce the processed data product. The ancillary datasets include CTD data (used to estimate speed of sound, depth, vertical velocity), GPS (used to estimate ship drift), magnetic declination (for ADCP magnetic compass correction), and shipboard ADCP (added as a constraint for the inverse method). Data files for the processed set are in ASCII text and NetCDF. Raw data are given in a variety of formats, some proprietary binary files, and made available in case a user prefers to reprocess the set from “level-0” status.

Resources

Name Format Description Link
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 journal article https://doi.org/10.1175/1520-0426(2002)019<0794:DVPULA>2.0.CO;2
0 Institution web page https://manoa.hawaii.edu/
0 Institution web page https://manoa.hawaii.edu/
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 dataset https://doi.org/10.25921/g961-ya97
0 Navigate directly to the URL for a descriptive web page with download links. https://www.ncei.noaa.gov/archive/accession/SIO-cDrake-LADCP
0 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 journal article https://doi.org/10.1175/1520-0426(1993)010<0764:DVPWSC>2.0.CO;2
0 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Search for data granules belonging to this collection (a granule is the smallest aggregation of data that can be independently described and retrieved). https://www.ncei.noaa.gov/metadata/granule/geoportal/?from=0&size=10&esdsl=%7B%22query%22%3A%7B%22bool%22%3A%7B%22must%22%3A%5B%7B%22query_string%22%3A%7B%22analyze_wildcard%22%3Atrue%2C%22query%22%3A%22fileid%3ASIO-cDrake-LADCP.*%22%7D%7D%5D%7D%7D%7D#searchPanel
0 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Navigate directly to the URL for a descriptive web page with download links. https://www.ncei.noaa.gov/archive/accession/SIO-cDrake-LADCP
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 journal article https://doi.org/10.1175/1520-0426(2002)019<0794:dvpula>2.0.co;2
0 dataset https://doi.org/10.25921/g961-ya97
0 Search for data granules belonging to this collection (a granule is the smallest aggregation of data that can be independently described and retrieved). https://www.ncei.noaa.gov/metadata/granule/geoportal/?from=0&size=10&esdsl=%7B%22query%22%3A%7B%22bool%22%3A%7B%22must%22%3A%5B%7B%22query_string%22%3A%7B%22analyze_wildcard%22%3Atrue%2C%22query%22%3A%22fileid%3ASIO-cDrake-LADCP.*%22%7D%7D%5D%7D%7D%7D#searchPanel
0 journal article https://doi.org/10.1175/1520-0426(1993)010<0764:dvpwsc>2.0.co;2
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Navigate directly to the URL for a descriptive web page with download links. https://www.ncei.noaa.gov/archive/accession/SIO-cDrake-LADCP
0 Search for data granules belonging to this collection (a granule is the smallest aggregation of data that can be independently described and retrieved). https://www.ncei.noaa.gov/metadata/granule/geoportal/?from=0&size=10&esdsl=%7B%22query%22%3A%7B%22bool%22%3A%7B%22must%22%3A%5B%7B%22query_string%22%3A%7B%22analyze_wildcard%22%3Atrue%2C%22query%22%3A%22fileid%3ASIO-cDrake-LADCP.*%22%7D%7D%5D%7D%7D%7D#searchPanel
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 journal article https://doi.org/10.1175/1520-0426(1993)010<0764:dvpwsc>2.0.co;2
0 journal article https://doi.org/10.1175/1520-0426(2002)019<0794:dvpula>2.0.co;2
0 dataset https://doi.org/10.25921/g961-ya97
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Navigate directly to the URL for a descriptive web page with download links. https://www.ncei.noaa.gov/archive/accession/SIO-cDrake-LADCP
0 Search for data granules belonging to this collection (a granule is the smallest aggregation of data that can be independently described and retrieved). https://www.ncei.noaa.gov/metadata/granule/geoportal/?from=0&size=10&esdsl=%7B%22query%22%3A%7B%22bool%22%3A%7B%22must%22%3A%5B%7B%22query_string%22%3A%7B%22analyze_wildcard%22%3Atrue%2C%22query%22%3A%22fileid%3ASIO-cDrake-LADCP.*%22%7D%7D%5D%7D%7D%7D#searchPanel
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 journal article https://doi.org/10.1175/1520-0426(1993)010<0764:dvpwsc>2.0.co;2
0 journal article https://doi.org/10.1175/1520-0426(2002)019<0794:dvpula>2.0.co;2
0 dataset https://doi.org/10.25921/g961-ya97
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Institution web page https://scripps.ucsd.edu/
0 Navigate directly to the URL for a descriptive web page with download links. https://www.ncei.noaa.gov/archive/accession/SIO-cDrake-LADCP
0 Search for data granules belonging to this collection (a granule is the smallest aggregation of data that can be independently described and retrieved). https://www.ncei.noaa.gov/metadata/granule/geoportal/?from=0&size=10&esdsl=%7B%22query%22%3A%7B%22bool%22%3A%7B%22must%22%3A%5B%7B%22query_string%22%3A%7B%22analyze_wildcard%22%3Atrue%2C%22query%22%3A%22fileid%3ASIO-cDrake-LADCP.*%22%7D%7D%5D%7D%7D%7D#searchPanel
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Institution web page https://scripps.ucsd.edu/
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 journal article https://doi.org/10.1175/1520-0426(1993)010<0764:dvpwsc>2.0.co;2
0 journal article https://doi.org/10.1175/1520-0426(2002)019<0794:dvpula>2.0.co;2
0 dataset https://doi.org/10.25921/g961-ya97
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords

Tags

  • fbn5hp
  • gn3n7p
  • z - depth
  • oceanography
  • m/s
  • u - east velocity
  • v - north velocity
  • th5yhw
  • m
  • dynamics and transport of the antarctic circumpolar current in the drake passage
  • t4200k
  • pf94ac
  • uerr - estimate of velocity error

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