Current/temperature measurements near the Sigsbee Escarpment from the MMS Desoto Canyon Intrusion Study, 19990829 - 20010906 (NCEI Accession 0002569)
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title: Current/temperature measurements near the Sigsbee Escarpment from the MMS Desoto Canyon Intrusion Study, 19990829 - 20010906 (NCEI Accession 0002569)
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abstract: During this study in-situ measurement of currents, temperature, and conductivity were made on a series of tautline moorings near the base of and on the Sigsbee Escarpment. These were supplemented during six of the 24 months of measurements by three Inverted Echo Sounders with Pressure. The primary objective of this project was documentation of near bottom/lower layer dynamics which have been identified as having high current speeds over an extended lower layer water column with near bottom intensification. Observations were often jointly funded by the MMS and BP. Results showed the layer below a nominal depth of 1000 m to have vertically highly coherent motion with a weak shear profile. The dominant process affecting currents at the base of the Escarpment appear to be Topographic Rossby Waves with periods of 8-11 days which moved through the study area in trains that could continue for many months. Current speeds as high as 1.75 kts. were measured 100 m above the bottom in 2000 m water depths.
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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.
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: current meter
type: current meter
description: current meter
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: inverted echo sounder (IES)
type: inverted echo sounder (IES)
description: A ocean bottom-moored instrument that measures the vertical acoustical travel time round-trip from the sea floor to the sea surface and back.
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: meteorological sensor
type: meteorological sensor
description: Any meteorological sensor, but also see specific instruments such as aerovane, anemometer, etc.