Use of Ship-mounted Acoustic Doppler Current Profiler Data to Study Mesoscale Oceanic Circulation Patterns in the Archipielago de Colon (Galapagos Islands) and the Gulf of the Farallones PDF Download
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Author: John B. Steger Publisher: ISBN: Category : Ocean circulation Languages : en Pages : 194
Book Description
Ship-mounted acoustic Doppler current profiler (ADCP) data are used to study regional ocean patterns around the biologically rich regions of the Archipielago de Colon (Galapagos Islands) and the Gulf of the Farallones to test our assumptions about the circulation derived primarily from hydrographic samples. West of the Galapagos, an equatorial undercurrent transporting 7 Sv was present in November 1993, which decelerated within 30 km of the archipelago, shoaled, and diverged with a strong deflection to the southwest. A method of removing tidal velocities from ADCP measurements by creating an empirical model of the tides and using it to predict and subtract the tides is described. It is shown that in the Gulf of the Farallones, a large number of observations, typically more than acquired on one cruise, are necessary to reduce tidal model error. Detided ADCP data are used to describe the circulation in the Gulf under various wind conditions. Over the continental slope, Surface-to-depth poleward flow is present throughout the year. During wind relaxations, poleward flow strengthens and warmer, fresher water is transported onshore.
Author: John B. Steger Publisher: ISBN: Category : Ocean circulation Languages : en Pages : 194
Book Description
Ship-mounted acoustic Doppler current profiler (ADCP) data are used to study regional ocean patterns around the biologically rich regions of the Archipielago de Colon (Galapagos Islands) and the Gulf of the Farallones to test our assumptions about the circulation derived primarily from hydrographic samples. West of the Galapagos, an equatorial undercurrent transporting 7 Sv was present in November 1993, which decelerated within 30 km of the archipelago, shoaled, and diverged with a strong deflection to the southwest. A method of removing tidal velocities from ADCP measurements by creating an empirical model of the tides and using it to predict and subtract the tides is described. It is shown that in the Gulf of the Farallones, a large number of observations, typically more than acquired on one cruise, are necessary to reduce tidal model error. Detided ADCP data are used to describe the circulation in the Gulf under various wind conditions. Over the continental slope, Surface-to-depth poleward flow is present throughout the year. During wind relaxations, poleward flow strengthens and warmer, fresher water is transported onshore.
Author: John M. Steger Publisher: ISBN: 9781423579489 Category : Languages : en Pages : 165
Book Description
Ship-mounted acoustic Doppler current profiler (ADCP) data are used to study regional ocean patterns around the biologically rich regions of the Archipielago de Colon (Galapagos Islands) and the Gulf of the Farallones to test our assumptions about the circulation derived primarily from hydrographic samples. West of the Galapagos, an equatorial undercurrent transporting Æ 7 Sv was present in November 1993, which decelerated within 30 km of the archipelago, shoaled, and diverged with a strong deflection to the southwest. A method of removing tidal velocities from ADCP measurements by creating an empirical model of the tides and using it to predict and subtract the tides is described. It is shown that in the Gulf of the Farallones, a large number of observations, typically more than acquired on one cruise, are necessary to reduce tidal model error. Detided ADCP data are used to describe the circulation in the Gulf under various wind conditions. Over the continental slope, Surface-to-depth poleward flow is present throughout the year. During wind relaxations, poleward flow strengthens and warmer, fresher water is transported onshore.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722096410 Category : Languages : en Pages : 30
Book Description
The degree to which Acoustic-Doppler Current Profiler (ADCP) and expendable bathythermograph (XBT) data can provide quantitative measurements of the velocity structure and transport of the Gulf Stream is addressed. An algorithm is used to generate salinity from temperature and depth using an historical Temperature/Salinity relation for the NW Atlantic. Results have been simulated using CTD data and comparing real and pseudo salinity files. Errors are typically less than 2 dynamic cm for the upper 800 m out of a total signal of 80 cm (across the Gulf Stream). When combined with ADCP data for a near-surface reference velocity, transport errors in isopycnal layers are less than about 1 Sv (10 to the 6th power cu m/s), as is the difference in total transport for the upper 800 m between real and pseudo data. The method is capable of measuring the real variability of the Gulf Stream, and when combined with altimeter data, can provide estimates of the geoid slope with oceanic errors of a few parts in 10 to the 8th power over horizontal scales of 500 km. Joyce, T. M. and Dunworth, J. A. and Schubert, D. M. and Stalcup, M. C. and Barbour, R. L. Unspecified Center NAGW-1026...
Author: David S. Mueller Publisher: CreateSpace ISBN: 9781500222666 Category : Technology & Engineering Languages : en Pages : 82
Book Description
The mission of the U.S. Geological Survey (USGS) Water Resources Discipline is to provide the information and understanding needed for wise management of the Nation's water resources. Inherent in this mission is the responsibility of collecting data that accurately describe the physical, chemical, and biological attributes of water systems. These data are used for environmental and resource assessments by the USGS, other government agencies and scientific organizations, and the general public. Reliable and quality-assured data are essential to the credibility and impartiality of the water-resources appraisals carried out by the USGS.
Author: U. S. Department U.S. Department of the Interior Publisher: CreateSpace ISBN: 9781505551747 Category : Languages : en Pages : 76
Book Description
In 2005 MMS announced Notice to Lessees and Operators (NTL) No. 2005-G05 "Deepwater Ocean Current Monitoring on Floating Facilities" that provides for the submittal of oceanographic data and current monitoring information to MMS via a single publicly available Internet site. The GOMR therefore established that all floating mobile offshore drilling units, and production facilities (with certain exceptions) operating or installed in water depths greater than 400 m must continuously monitor and gather ocean current data in a real-time basis from near the ocean surface (~30 m) to ~1000 m using acoustic Doppler current profiles (ADCP) current monitoring or compatible equipment. The data must be recorded at least once every 12 hours and reported to MMS via the Internet. In water depths greater than ~1100 m, additional equipment, preferably an upward-looking ADCP, is to be installed near ~100 m above bottom. Data from this system should record at least once every 20 minutes. Data are to be reported to MMS via the Internet within 30 days of retrieval. The number of sites required to report data are estimated to be in the range of 30-40. Data will be passed through preliminary (Level 1) processing procedures and reported by the National Data Buoy Center (NDBC).
Author: John B. Steger
Author: John B. Steger
Author: John M. Steger
Author: 
Author: Steven J. Bograd
Author: Paul F. Jessen
Author: Paul F. Jessen
Author: National Aeronautics and Space Administration (NASA)
Author: David S. Mueller
Author: U. S. Department U.S. Department of the Interior
Author: Douglas Wilson