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ALACE subsurface drifter data in South Pacific, for March 1995 (NCEI Accession 9500149)


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      DateTime:  2023-08-08T18:08:14Z
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            title:  ALACE subsurface drifter data in South Pacific, for March 1995 (NCEI Accession 9500149)
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                date:  2002-11-19
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                  Anchor:  NCEI Accession ID 9500149
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/person/details/2075 Jeffrey T. Sherman
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/983 University of California - San Diego; Scripps Institution of Oceanography (SIO)
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/983 University of California - San Diego; Scripps Institution of Oceanography (SIO)
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/998 Alaska State Department of Fish and Game - Kodiak
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        abstract:  The ALACE (Autonomous LAgrangian Circulation Explorer) is a subsurface drifter, periodically rising to the surface to relay data to ARGOS. Instrument location is then obtained from ARGOS. An ALACE profiler collects data on ascent and relays a compressed data set to ARGOS. The amount of time spent at its neutrally-buoyant depth, and then at the surface, is variable, dependent upon the deployment site and the main scientific objective of the ALACE. Profiling ALACEs generally complete a cycle every 8-10 days, spending 24 hours at the surface transmitting to ARGOS.
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            otherConstraints:  Cite as: Sherman, Jeffrey T.; Scripps Institution of Oceanography (2002). ALACE subsurface drifter data in South Pacific, for March 1995 (NCEI Accession 9500149). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/9500149. 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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                    beginPosition:  1995-03-01
                    endPosition:  1995-03-22
        supplementalInformation:  DEPTH-AVERAGING A profile is taken on ascent, with T sampled every 3 s while ALACE is ascending at 10-15 cm/s. The data is depth-averaged and compressed for transmission through ARGOS. The degree of averaging increases with depth. For instance, a profile might start out with 5 m resolution from 0-200 m depth, switching to 10 m resolution from 200-800 m, followed by 20 m resolution to 1200 m. SENSOR DESCRIPTION TEMPERATURE: A thermistor bead from YSI (YSI-44016) is used, having a typical drift of <0.01 deg. C over 1 year, increasing to 0.02 deg. C over 8 years. Laboratory calibration of thermistors typically have less than 0.002 deg. C standard deviation. The largest error comes from the 12-bit a/d (Linear Technology's LTC1290) which resolves T to 0.01-0.02 deg C, with better resolution obtained at low temperatures. PRESSURE: A Paines 210-38 with 0-3000 PSI range is used. Quoted accuracy from thermal drift, non-linearity, hysteresis, and repeatability is ~10 dBar. Observations of a few units in laboratory testing suggest an accuracy of ~5 dBar. OTHER PROFILING ALACEs: At this time, there are a few CTD ALACEs. Sampling and data format are the same as the temperature profiler, with the addition of conductivity also being transmitted. The units have not been thoroughly tested for long-term accuracy, and thus their data sets are not ready for release. SUBSURFACE DRIFT RATE The difference in locations between profiles includes the subsurface drift and the 24 hour surface drift in one complete ALACE cycle. Therefore the NODC data set itself could be used to estimate deep currents, but accuracy would be limited by the unknown surface drift. Dr. Davis uses a fairly sophisticated algorithm to extrapolate the surface drift from the set of ARGOS fixes for the 24 hours ALACE is transmitting. I believe Russ Davis's intent is to provide temperature profiles in the same format as the NODC XBT data set, so people can readily use the ALACE data without requiring any further programming.
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1730 NOAA National Centers for Environmental Information
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                    phone:  (CI_Telephone)
                        voice:  +1-301-713-3277
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                    linkage: ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0001/9500149/
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                description:  NCEI Accession 9500149 v1.1 was published.
                dateTime:
                  DateTime:  2002-11-19T19:40:22Z
                output:  (LE_Source)
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                        title:  NCEI Accession 9500149 v1.1
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                                    linkage: https://www.ncei.noaa.gov/archive/accession/9500149/1.1
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                                    name:  NCEI Accession 9500149 v1.1
                                    description:  published 2002-11-19T19:40:22Z
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                description:  NCEI Accession 9500149 was revised and v1.2 was published.
                rationale:  Additional metadata files were received or created for this dataset. These updates were copied into the about/ directory of this accession. These updates may provide additional files or replace obsolete files. This version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession.
                dateTime:
                  DateTime:  2013-03-19T17:48:14Z
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                        title:  NCEI Accession 9500149 v1.2
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                                    linkage: https://www.ncei.noaa.gov/archive/accession/9500149/1.2
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                                    name:  NCEI Accession 9500149 v1.2
                                    description:  published 2013-03-19T17:48:14Z
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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.
        maintenanceNote:  NCEI Accession 9500149 was revised and a new version of the archival package was published. Updates to existing archival packages may provide additional files or replace obsolete files. The latest version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession. Please see journal.txt in the /about directory for additional details on changes made.
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            organisationName:  NOAA National Centers for Environmental Information
            role:  (CI_RoleCode) custodian
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    acquisitionInformation:  (MI_AcquisitionInformation)
        instrument:  (MI_Instrument)
            identifier:  (MD_Identifier)
                code:  bathythermograph - uBT
            type:  bathythermograph - uBT
            description:  Micro BathyThermograph
        instrument:  (MI_Instrument)
            identifier:  (MD_Identifier)
                code:  CTD
            type:  CTD
            description:  Conductivity-Temperature-Depth probe