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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                date:  2011-01-14
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        abstract:  During this study in-situ measurement of currents,temperature, 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. [Abstract from the data originator]
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                title:  Global Change Master Directory (GCMD) Location Keywords
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                    date:  2018-03-15
                    dateType:  (CI_DateTypeCode) publication
                edition:  8.6
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA)
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                        address:  (CI_Address)
                            city:  Greenbelt
                            administrativeArea:  MD
                        onlineResource:  (CI_OnlineResource)
                            linkage: https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
                            protocol:  HTTPS
                            name:  Global Change Master Directory (GCMD) Keywords
                            description:  The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
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            otherConstraints:  Cite as: Blankinship, Paul R.; Science Applications International Corporation - Raleigh, NC (2011). Current/temperature measurements near the Sigsbee Escarpment from the MMS Desoto Canyon Intrusion Study, 19990829 - 20010906 (NCEI Accession 0002569). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://accession.nodc.noaa.gov/0002569. Accessed [date].
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            useLimitation:  Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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            otherConstraints:  Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
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        topicCategory:  (MD_TopicCategoryCode) oceans
        topicCategory:  (MD_TopicCategoryCode) climatologyMeteorologyAtmosphere
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                extent:
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                    beginPosition:  1999-08-29
                    endPosition:  2001-09-06
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                  Anchor:  https://www.nodc.noaa.gov/cgi-bin/OAS/prd/institution/details/1730 DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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                        voice:  301-713-3277
                        facsimile:  301-713-3300
                    address:  (CI_Address)
                        deliveryPoint:  Federal Building 151 Patton Avenue
                        city:  Asheville
                        administrativeArea:  NC
                        postalCode:  28801-5001
                        country:  USA
                        electronicMailAddress:  NCEI.Info@noaa.gov
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                fees:  In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
                orderingInstructions:  Contact NCEI for other distribution options and instructions.
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                    linkage: ftp://ftp.nodc.noaa.gov/nodc/archive/arc0023/0002569/
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                    description:  These data are available through the File Transfer Protocol (FTP). You may use any FTP client to download these data.
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                description:  NCEI Accession 0002569 v1.1 was published.
                dateTime:
                  DateTime:  2011-01-14T05:33:57Z
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                        title:  NCEI Accession 0002569 v1.1
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                                    linkage: https://accession.nodc.noaa.gov/0002569/1.1
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                                    name:  NCEI Accession 0002569 v1.1
                                    description:  NCEI Accession 0002569 v1.1
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                other:  NOAA National Centers for Environmental Information
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                description:  NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
                dateTime:
                  DateTime:  2015-04-22T00:00:00
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        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) asNeeded
        maintenanceNote:  Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
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            organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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            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.
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                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 sensors
            type:  meteorological sensors
            description:  meteorological sensors