ADCP velocity, echo intensity, and compass heading from two near-bottom moorings in the south equatorial Atlantic Ocean from 2009-12-01 to 2010-03-23 (NCEI Accession 0209071)
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title: ADCP velocity, echo intensity, and compass heading from two near-bottom moorings in the south equatorial Atlantic Ocean from 2009-12-01 to 2010-03-23 (NCEI Accession 0209071)
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abstract: This dataset contains ADCP velocity, echo intensity, and compass heading from two near-bottom moorings in the south equatorial Atlantic Ocean in the Congo submarine canyon during ~3 month period from 2009-12-01 to 2010-03-23. Two ADCPs with acoustic frequencies of 300 kHz and 75 kHz were deployed on separate moorings placed in the channel axis 700 m apart and at ~2000 m water depth. They acquired data over a range of ~80 m above the seafloor (300 kHz) and 220 m above the seafloor (75 kHz). Data are in netcdf.
purpose: This dataset is available to the public for a wide variety of uses including scientific research and analysis.
credit: Funding Agency: Natural Environment Research Council (NERC), Leverhulme, University of Hull
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linkage: https://www.ncei.noaa.gov/archive/accession/0209071/1.1
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name: NCEI Accession 0209071 v1.1
description: published 2020-03-03T23:54:06Z
function: (CI_OnLineFunctionCode) download
role: (inapplicable)
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: Parameter or Variable: Flow Speed (measured); Units: m/s; Observation Category: in situ; Sampling Instrument: ADCP 75 kHz and 300 kHz; Sampling and Analyzing Method: Data were acquired in the Congo submarine canyon over a ~3 month period in 2010. Two ADCPs with acoustic frequencies of 300 kHz and 75 kHz were deployed on separate moorings placed in the channel axis 700 m apart and at ~2000 m water depth. They acquired data over a range of ~80 m above the seafloor (300 kHz) and 220 m above the seafloor (75 kHz) at profileing intervals of 5 s (300 kHz) and 6 s (75 kHz).; Data Quality Method: Velocity data were discarded by the instruments when correlation values dropped below 64 counts or when the ambiguity velocity was greater than 2 m/s.
processStep: (LE_ProcessStep)
description: Parameter or Variable: Echo Intensity (measured); Units: RSSI; Observation Category: in situ; Sampling Instrument: ADCP 75 kHz and 300 kHz; Sampling and Analyzing Method: Data were acquired in the Congo submarine canyon over a ~3 month period in 2010. Two ADCPs with acoustic frequencies of 300 kHz and 75 kHz were deployed on separate moorings placed in the channel axis 700 m apart and at ~2000 m water depth. They acquired data over a range of ~80 m above the seafloor (300 kHz) and 220 m above the seafloor (75 kHz) at profileing intervals of 5 s (300 kHz) and 6 s (75 kHz)..
processStep: (LE_ProcessStep)
description: Parameter or Variable: Compass Heading (measured); Units: degree; Observation Category: in situ; Sampling Instrument: ADCP 75 kHz and 300 kHz; Sampling and Analyzing Method: Compass heading (clockwise from North) recorded for every ADCP profile.
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
contact: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) custodian
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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.
platform: (MI_Platform)
identifier: (MD_Identifier)
code: moorings
description: entry created as MOORINGS OF UNITED STATES, but has been used as a generic MOORINGS entry.
instrument: (missing)
