Ocean currents from lowered acoustic Doppler current profilers (LADCP), water temperature, salinity, and others taken by CTD of the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) aboard the research vessel Roger Revelle, cruise RR2204, along WOCE-Lines P02 in the North Pacific from 2022-04-30 to 2022-06-10. (NCEI Accession 0289389)
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title: Ocean currents from lowered acoustic Doppler current profilers (LADCP), water temperature, salinity, and others taken by CTD of the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) aboard the research vessel Roger Revelle, cruise RR2204, along WOCE-Lines P02 in the North Pacific from 2022-04-30 to 2022-06-10. (NCEI Accession 0289389)
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abstract: This data set contains the Lowered Acoustic Doppler Current Profile (LADCP) estimates of ocean currents and shear as well as water temperature, salinity, and others taken by CTD in a profile to deep waters from the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP). 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 R.Revelle for cruise TN390 on World Ocean Circulation Experiment lines A22 from 2022-04-30 to 2022-06-10. This cruise is part of the NCEI collection for GO-SHIP LADCP. The finalized datasets have been assembled and submitted to NCEI by the LADCP data management staff of University of Hawaii and the Lamont-Doherty Earth Observatory. The originators of each LADCP set are defined within the accession documentation. Data files for the processed set are in ASCII text, PDF, and NetCDF. Raw data are given in proprietary binary files and made available in case a user prefers to reprocess the set from “level-0” status.
purpose: To understand the ocean currents through the water column.
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title: 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. Journal of Atmospheric and Oceanic Technology, 27(7), 1215–1227. https://doi.org/10.1175/2010jtecho708.1
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title: Polzin, K., Kunze, E., Hummon, J., & Firing, E. (2002). The Finescale Response of Lowered ADCP Velocity Profiles. Journal of Atmospheric and Oceanic Technology, 19(2), 205–224. https://doi.org/10.1175/1520-0426(2002)019<0205:tfrola>2.0.co;2
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title: Visbeck, M. (2002). Deep Velocity Profiling Using Lowered Acoustic Doppler Current Profilers: Bottom Track and Inverse Solutions*. Journal of Atmospheric and Oceanic Technology, 19(5), 794–807. https://doi.org/10.1175/1520-0426(2002)019<0794:dvpula>2.0.co;2
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title: Thurnherr, A.M., M.Visbeck, E.Firing, B.A. King, J.M Hummon, G.Krahmann, and B.Huber. 2010. A Manual for Acquiring Lowered Doppler Current Profiler Data. GO-SHIP, IOCCP Report No. 14, ICPO Publication Series No 134, Version 1, 2010
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title: Thurnherr, A.M. Processing LADCP/CTD Data For Vertical Velocity, FinescaleVertical Kinetic Energy Density and Turbulence Estimates, LADCPwSoftware V1.4
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description: Parameter or Variable: • CURRENT SPEED - EAST/WEST COMPONENT (U) (measured); Units: m/s; Observation Category: in situ; Sampling Instrument: ADCP; Sampling and Analyzing Method: Acoustic Doppler Current Profilers (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"). The goal is to determine water velocities to the full depth of the ocean for each 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. 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. These ancillary measurements include Conductivity, Temperature, and Depth, at 24Hz, with 1Hz position, and shipboard ADCP data.; Data Quality Method: Two levels of data are provided: 1. raw-level0 directory: The raw data can be considered to be "level 0", i.e. original data from an instrument. The goal of the level-0 data is that someone would be able to take modern processing techniques and apply them to older datasets. 2. processed-level1: The processed data can be considered to be "level 1", i.e. algorithms combining data from ancillary measurements along with the LADCP data, transformations and editing, and other algorithms are applied along with some quality control, to create a profile of ocean velocity. These data products are the "state of the art at the time"; they have not been reprocessed with modern methods. Note that different processing methods contain different tools to estimate errors--these are contained in the datasets and are accessible to users. Users should be cautioned: LADCP velocities are likely to be most reliable in regions with strong scattering and strong currents. In regions with low scattering and weak currents, for example the center of any ocean gyre and below the main thermocline, LADCP velocities are likely to be suspect..
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description: Parameter or Variable: CURRENT SPEED - NORTH/SOUTH COMPONENT (V) (Measured) (measured); Units: m/s; Observation Category: in situ; Sampling Instrument: ADCP; Sampling and Analyzing Method: Acoustic Doppler Current Profilers (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"). The goal is to determine water velocities to the full depth of the ocean for each 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. 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. These ancillary measurements include Conductivity, Temperature, and Depth, at 24Hz, with 1Hz position, and shipboard ADCP data.; Data Quality Method: Two levels of data are provided: 1. raw-level0 directory: The raw data can be considered to be "level 0", i.e. original data from an instrument. The goal of the level-0 data is that someone would be able to take modern processing techniques and apply them to older datasets. 2. processed-level1: The processed data can be considered to be "level 1", i.e. algorithms combining data from ancillary measurements along with the LADCP data, transformations and editing, and other algorithms are applied along with some quality control, to create a profile of ocean velocity. These data products are the "state of the art at the time"; they have not been reprocessed with modern methods. Note that different processing methods contain different tools to estimate errors--these are contained in the datasets and are accessible to users. Users should be cautioned: LADCP velocities are likely to be most reliable in regions with strong scattering and strong currents. In regions with low scattering and weak currents, for example the center of any ocean gyre and below the main thermocline, LADCP velocities are likely to be suspect..
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description: Parameter or Variable: CURRENT SPEED - UP/DOWN COMPONENT (W) (Measured) (measured); Units: m/s; Observation Category: in situ; Sampling Instrument: ADCP; Sampling and Analyzing Method: Acoustic Doppler Current Profilers (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"). The goal is to determine water velocities to the full depth of the ocean for each 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. 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. These ancillary measurements include Conductivity, Temperature, and Depth, at 24Hz, with 1Hz position, and shipboard ADCP data.; Data Quality Method: Two levels of data are provided: 1. raw-level0 directory: The raw data can be considered to be "level 0", i.e. original data from an instrument. The goal of the level-0 data is that someone would be able to take modern processing techniques and apply them to older datasets. 2. processed-level1: The processed data can be considered to be "level 1", i.e. algorithms combining data from ancillary measurements along with the LADCP data, transformations and editing, and other algorithms are applied along with some quality control, to create a profile of ocean velocity. These data products are the "state of the art at the time"; they have not been reprocessed with modern methods. Note that different processing methods contain different tools to estimate errors--these are contained in the datasets and are accessible to users. Users should be cautioned: LADCP velocities are likely to be most reliable in regions with strong scattering and strong currents. In regions with low scattering and weak currents, for example the center of any ocean gyre and below the main thermocline, LADCP velocities are likely to be suspect..
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description: Parameter or Variable: HYDROSTATIC PRESSURE (Measured) (measured); Units: dbar; Observation Category: in situ; Sampling Instrument: pressure sensors; Sampling and Analyzing Method: part of the instrument package; Data Quality Method: standard QC techniques applied.
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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.
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description: GCMD instruments - In Situ/Laboratory Instruments > Pressure/Height Meters > PRESSURE SENSORS ASFA Thesaurus - pressure sensors http://www4.fao.org/asfa/asfa.htm
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