Water temperature, conductivity, and other parameters from CTD and ADCP below ice shelf in the Ross Sea from 2015-01-09 to 2015-01-19 (NCEI Accession 0176082)


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            title:  Water temperature, conductivity, and other parameters from CTD and ADCP below ice shelf in the Ross Sea from 2015-01-09 to 2015-01-19 (NCEI Accession 0176082)
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                date:  2018-09-18
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                  Anchor:  NCEI Dataset ID gov.noaa.nodc:0176082
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                  Anchor:  NCEI Accession Number 0176082
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                  Anchor:  https://www.nodc.noaa.gov/cgi-bin/OAS/prd/person/details/5195 Carolyn Begeman
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                  Anchor:  https://www.nodc.noaa.gov/cgi-bin/OAS/prd/institution/details/1873 Los Alamos National Laboratory (LANL)
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                individualName:  Carolyn Begeman
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                individualName:  Begeman, Carolyn Branecky
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                individualName:  Mikucki, Jill A.
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                individualName:  Hodson, Timothy O.
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        abstract:  This dataset contains profiles of water conductivity, temperature, pressure, and derived practical salinity in the Ross Ice Shelf cavity near the Whillans Ice Stream grounding zone. At this site, the water thickness in the cavity is 10.35 m. We also present mean and standard deviation of current speed at mid-depth, roughly 5 m below the ice-shelf base. The ice shelf at this site was 755 m thick. Data are in text format.
        purpose:  These data were collected to investigate the oceanography and biology of a grounding zone setting as part of the Whillans Ice Stream Subglacial Access Research Drilling (WISSARD) Project.
        credit:  Related Funding Agency: National Science Foundation
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            otherConstraints:  Cite as: Begeman, Carolyn Branecky; Mikucki, Jill A.; Hodson, Timothy O. (2018). Water temperature, conductivity, and other parameters from CTD and ADCP below ice shelf in the Ross Sea from 2015-01-09 to 2015-01-19 (NCEI Accession 0176082). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://accession.nodc.noaa.gov/0176082. 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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                extent:
                  TimePeriod:
                    beginPosition:  2015-01-09
                    endPosition:  2015-01-19
        supplementalInformation:  Submission Package ID: GETAGA
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    distributionInfo:  (MD_Distribution)
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                organisationName:
                  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
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        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
                role:  (CI_RoleCode) pointOfContact
            distributionOrderProcess:  (MD_StandardOrderProcess)
                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: https://accession.nodc.noaa.gov/0176082
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) dataset
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                description:  NCEI Accession 0176082 v1.1 was published.
                dateTime:
                  DateTime:  2018-09-18T17:15:14Z
                output:  (LE_Source)
                    sourceCitation:  (CI_Citation)
                        title:  NCEI Accession 0176082 v1.1
                        date:  (CI_Date)
                            date: (inapplicable)
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                                    linkage: https://accession.nodc.noaa.gov/0176082/1.1
                                    protocol:  HTTPS
                                    name:  NCEI Accession 0176082 v1.1
                                    description:  published 2018-09-18T17:15:14Z
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                description:  Parameter or Variable: CONDUCTIVITY (measured); Units: microsiemens/cm; Observation Category: in situ; Sampling Instrument: CTD - specific model; Sampling and Analyzing Method: Sea-bird Electronics 19plus V2 sampling at a frequency of 4 Hz.
            processStep:  (LE_ProcessStep)
                description:  Parameter or Variable: TEMPERATURE - WATER [WATER TEMPERATURE] (measured); Units: degrees Celsius; Observation Category: in situ; Sampling Instrument: CTD - specific model; Sampling and Analyzing Method: Sea-bird Electronics 19plus V2 sampling at a frequency of 4 Hz.
            processStep:  (LE_ProcessStep)
                description:  Parameter or Variable: PRESSURE - WATER [HYDROSTATIC PRESSURE] (measured); Units: decibar; Observation Category: in situ; Sampling Instrument: CTD - specific model; Sampling and Analyzing Method: Sea-bird Electronics 19plus V2 sampling at a frequency of 4 Hz.
            processStep:  (LE_ProcessStep)
                description:  Parameter or Variable: SALINITY (measured); Units: psu; Observation Category: in situ; Sampling Instrument: CTD - specific model; Sampling and Analyzing Method: Sea-bird Electronics 19plus V2 sampling at a frequency of 4 Hz. Practical salinity is calculated from conductivity, temperature and pressure using the International Thermodynamic Equation of Seawater (International Oceanographic Commission, 2010) coded in Gibbs Seawater (GSW) Matlab toolbox..
            processStep:  (LE_ProcessStep)
¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†description: ¬†Parameter or Variable: CURRENT METER - SPEED (calculated); Units: m/s; Observation Category: in situ; Sampling Instrument: ADCP; Sampling and Analyzing Method: Current speed and direction were measured with Nortek Aquadopp 2 MHz Acoustic Doppler Current Profiler. Acoustic backscatter levels were very weak due to low concentrations of suspended particulate matter. Measurements were made at 1 Hz then only the first range bin was low pass filtered at 2 mHz for an interval of 5-6 hours with the sensor stationed ~5 m below the ice shelf base near the middle of the water column.; Data Quality Method: Since current variability is not expected on very short timescales, the average standard deviation of velocity measurements over 10-minute intervals is taken to be an in situ estimate of instrumental noise, equal to 0.2 cm/s. We only analyzed data collected when the ADCP was rotating less than 2¬į s^-1 and the current orientation was changing less than 2¬į s^-1 during intervals of at least 30 s..
            processStep:  (LE_ProcessStep)
¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†¬†description: ¬†Parameter or Variable: CURRENT METER - DIRECTION (calculated); Units: degrees true; Observation Category: in situ; Sampling Instrument: ADCP; Sampling and Analyzing Method: Current speed and direction were measured with Nortek Aquadopp 2 MHz Acoustic Doppler Current Profiler. Acoustic backscatter levels were very weak due to low concentrations of suspended particulate matter. Measurements were made at 1 Hz then only the first range bin was low pass filtered at 2 mHz for an interval of 5-6 hours with the sensor stationed ~5 m below the ice shelf base near the middle of the water column.; Data Quality Method: Since current variability is not expected on very short timescales, the average standard deviation of velocity measurements over 10-minute intervals is taken to be an in situ estimate of instrumental noise, equal to 0.2 cm/s. We only analyzed data collected when the ADCP was rotating less than 2¬į s^-1 and the current orientation was changing less than 2¬į s^-1 during intervals of at least 30 s..
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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) asNeeded
        maintenanceNote:  Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
        contact:  (CI_ResponsibleParty)
            organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
            role:  (CI_RoleCode) custodian
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    acquisitionInformation:  (MI_AcquisitionInformation)
        instrument:  (MI_Instrument)
            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.
        instrument:  (MI_Instrument)
            identifier:  (MD_Identifier)
                code:  CTD
            type:  CTD
            description:  Conductivity-Temperature-Depth probe