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    • CTD data from Rhode Island Sound collected from R/V Hope Hudner in 2009-2010 in support of Rhode Island Ocean Special Area Management Plan (NCEI Accession 0109929)

    Metadata Updated: May 1, 2025

    The dataset consists of 173 CTD casts in Rhode Island and Block Island Sounds obtained during 4 surveys. The surveys were performed during 22-24 September 2009, 7-8 December 2009, 9-11 March 2010, and 16-18 June 2010. The casts cover the nearly the entire watercolumn from the surface to approximately 2 m above the bottom. The data were obtained with a SeaBird SBE19plus, which measures temperature, conductivity, pressure, optical backscatter, chlorophyll fluorescence, oxygen, and photosynthetically active radiation (PAR). All sensors were sampled at 4 Hz. The data were processed using the SeaBird data processing software suite, SBEDataProcessing-Win32. A low pass filter, with time constant of 1 s, was applied to the pressure record. Temperature and conductivity were low pass filtered with a 0.5 s filter time constant. To account for the relatively slower response of the temperature sensor, the temperature was advanced in time by 0.5 seconds relative to pressure. The oxygen voltage was advanced relative to pressure by 2 seconds for the September, December, and June survey casts and 5 seconds for the March survey casts. A correction for conductivity cell thermal mass effects was applied to the conductivity signal using the parameters recommended by SeaBird (alpha=0.04, 1/beta=8.0). A loop edit step was then applied, whereby portions of the cast in which the pressure was not changing sufficiently fast (0.1 dbar/s) were removed. This was followed by computation of salinity, sigma-t, and oxygen concentration. Finally, the data from the downcast were averaged into 1 dbar bins. Further details of the CTD data processing can be found in the header portion of the individual cast files. The final data files contain raw sensor values (1 dbar bin averages) plus a number of derived variables (e.g., salinity, sigma-t, oxygen). A full list of the output variables is contained in the header portion of the cast files.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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    Dates

    Metadata Date 2024-08-21T23:27:18Z
    Metadata Created Date July 2, 2021
    Metadata Updated Date May 1, 2025
    Reference Date(s) July 11, 2013 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NOAA/NESDIS/ncei/accessions

    Other Data Resources

    Graphic Preview

    Preview graphic

    Additional Metadata

    Resource Type Dataset
    Metadata Date 2024-08-21T23:27:18Z
    Metadata Created Date July 2, 2021
    Metadata Updated Date May 1, 2025
    Reference Date(s) July 11, 2013 (publication)
    Responsible Party (Point of Contact)
    Contact Email
    Guid gov.noaa.nodc:0109929
    Access Constraints Cite as: Ullman, David; University of Rhode Island > Graduate School of Oceanography (2013). CTD data from Rhode Island Sound collected from R/V Hope Hudner in 2009-2010 in support of Rhode Island Ocean Special Area Management Plan (NCEI Accession 0109929). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0109929. Accessed [date]., 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.
    Bbox East Long -70.881
    Bbox North Lat 41.426
    Bbox South Lat 40.962
    Bbox West Long -71.808
    Coupled Resource
    Frequency Of Update asNeeded
    Graphic Preview Description Preview graphic
    Graphic Preview File https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0109929
    Graphic Preview Type PNG
    Harvest Object Id 77edb2dd-6531-41ae-9bb7-1f7a1036728c
    Harvest Source Id c084a438-6f6b-470d-93e0-16aeddb9f513
    Harvest Source Title NOAA/NESDIS/ncei/accessions
    Licence accessLevel: Public
    Lineage
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-71.808, 40.962], [-70.881, 40.962], [-70.881, 41.426], [-71.808, 41.426], [-71.808, 40.962]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2009-09-22
    Temporal Extent End 2010-06-18

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