NODC Standard Product: Naval Surface Weapons Center (NSWC) moored ADCP data 1994-1995 (Straits of Florida) (NCEI Accession 0095602)
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abstract: This database contains Acoustic Doppler Current Profiler (ADCP) data collected during 1994-1995 on the eastern shelf of Florida. The data were collected at ten-minute intervals by a bottom mounted 300-KHz ADCP unit (from RD Instruments, San Diego, CA) which was set offshore Ft. Lauderdale, Florida, at a depth of 140 meters. The instrument is positioned at approximately 26°04.0'N by 80°03.5'W. This unit is supported by the United States Naval Surface Warfare Center (NSWC), which receives data directly from the ADCP by way of a submerged cable. Following negotiations in 1993, a cooperative effort was established between the National Oceanic and Atmospheric Administration (NOAA) and the NSWC to forward the ADCP data collected by NSWC to the NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) in Miami, Florida. Since April 1994, AOML has been receiving the data from NSWC. CD-ROM NODC-71 contains six subdirectories: BINARY, ASC, FLT, PLOTS, PGMS, and README. The BINARY subdirectory contains the original ADCP files as received from NSWC. The ASC subdirectory contains corresponding processed ADCP files in an ASCII format. The FLT subdirectory contains the ADCP data in a format processed to give north-south and east-west velocities at each bin depth. The PLOTS subdirectory contains the velocities found in the flat files projected as color Hovmöller plots in GIF format. The README subdirectory contains the documentation files, and the PGMS subdirectory contains sample FORTRAN programs that can be used to analyze the data. CD-ROM NODC-59 contains the same data from 1994 as NODC-71 but no data from 1995. NODC-59 is superseded by NODC-71. NOTE: Advanced programming skills are highly recommended for users of the data on this CD-ROM product.
purpose: This dataset is available to the public for a wide variety of uses including scientific research and analysis.
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supplementalInformation: The contents of these discs are available as 1) a compressed .tar file via the download data button (download size limit may prevent obtaining all data in one transaction); 2) a complete ISO 9660 disc image, from which an identical replica of the original disc may be burned on new CD/DVD media, by navigating to the .iso file in the data/0-data/disc_image/ subdirectory; 3) individual files, by navigating to specific file(s) in the data/0-data/disc_contents/ subdirectory.
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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.