Eastward and northward components of ocean current profiles from ADCP taken from small boat in Sarqardleq Fjord adjacent to a tidewater glacier, West Greenland from 2013-07-25 to 2013-07-27 (NCEI Accession 0177127)
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title: Eastward and northward components of ocean current profiles from ADCP taken from small boat in Sarqardleq Fjord adjacent to a tidewater glacier, West Greenland from 2013-07-25 to 2013-07-27 (NCEI Accession 0177127)
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abstract: This dataset contains underway ADCP current velocity profiles from Sarqardleq Fjord in West Greenland. Collected with RDI Workhorse 300 kHz ADCP (#14257) during July 25-27, 2013. Data are in netcdf format.
purpose: The interaction of the ocean with tidewater glaciers around the margins of the Greenland Ice Sheet is thought to be a key control on ice sheet stability. Thus, understanding the processes which drive melting of the calving fronts of tidewater glaciers by the ocean is fundamental to projections of future global mean sea level rise. Our understanding is however currently limited, partly due to the scarcity of oceanographic data from close to the calving fronts of tidewater glaciers. The primary goal of these ADCP water velocity measurements was to quantify the ocean conditions adjacent to a west Greenland tidewater glacier. In particular, knowledge of the water velocity is highly valuable as these are understood to be one of the two primary variables determining the rate at which the ocean melts the calving front of the glacier.
credit: Funding Agency: NSF OPP
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description: Parameter or Variable: CURRENT - SPEED - SOUTH COMPONENT [CURRENT SPEED - NORTH/SOUTH COMPONENT (V)] (measured); Units: m/s; Observation Category: in situ; Sampling Instrument: RDI Workhorse 300 kHz ADCP #14257.
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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.