Current speed from ADCP taken from the research vessel Roger Revelle in the Mariana arc from 2014-11-28 to 2014-12-20 (NCEI Accession 0170535)
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title: Current speed from ADCP taken from the research vessel Roger Revelle in the Mariana arc from 2014-11-28 to 2014-12-20 (NCEI Accession 0170535)
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abstract: This dataset provides ocean current velocities and directions that were quantified using a hull-mounted Teledyne RDI 75 KHz ADCP in December 2014 for the Submarine Ring of Fire – Ironman field effort aboard R/V Roger Revelle. ADCP data were collected, processed, and analyzed using the University of Hawaii data acquisition system (UHDAS) [Firing and Hummon, 2010; Firing et al., 2012]. The ADCP was operated in narrowband mode, producing current profiles that typically reached 625 m and were processed to five minute averages and 16 m depth bins. Data are in netCDF format.
purpose: This data was used to constrain chemical flux export rates of a submarine arc volcano. Specifically, Ahyi Seamount, a shallow (<100 m) submarine intra-oceanic arc volcano located in the Northern Mariana Islands and erupted in May 2014.
credit: Related Funding Agency: National Science Foundation (NSF)
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description: Parameter or Variable: CURRENT SPEED (measured); Units: m/s; Observation Category: in situ; Sampling Instrument: ADCP; Sampling and Analyzing Method: RDI Ocean Surveyor 75nb; Firing, E., and J. Hummon (2010), Shipboard ADCP measurements, Shipboard ADCP measurements, The GO-SHIP Repeat Hydrography Manual: A collection of Expert Reports and Guidelines, IOCCP Report No. 14, ICPO Publication Series No. 134.; Data Quality Method: UHDAS for processing and QA/QC; Firing, E., J. Hummon, and T. Chereskin (2012), Improving the Quality and Accessibility of Current Profile Measurements in the Southern Ocean, Oceanography, 25(3), 164-165..
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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: R/V Roger Revelle
description: Flag: United States Type: Research Vessel IMO: 9075228 Company: Scripps Institution of Oceanography DOB: 1996-06 https://scripps.ucsd.edu/ships/revelle
instrument: (missing)
