Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content
  • Feedback

    • Water temperature, salinity, beam attenuation, and other parameters from CTD from the research vessel Knorr in the Western North Atlantic from 1979-09-09 to 1979-10-01 (NCEI Accession 0189618)

    Metadata Updated: March 1, 2025

    This dataset contains water temperature, salinity, beam attenuation, and other parameters taken by CTD/transmissometer collected in 1979 during the High-Energy Benthic Boundary-Layer Experiment (HEBBLE, https://darchive.mblwhoilibrary.org/handle/1912/10611), a program designed to test the hypothesis that seabed modifications can result from contemporary local erosion and deposition. We observed several 'benthic storms' that re-suspended record-high concentrations of particulate matter – filtered samples showed up to 12,700 µg/l. As part of HEBBLE activities, full water column CTD/Transmissometer/Nephelometer data were collected at 44 stations during R/V Knorr cruise KN74 (09/09/1979-10/01/1979). Beam attenuation data were acquired with a 1-m path-length red LED (660 nm wavelength) SeaTech transmissometer interfaced with the CTD. A Lamont nephelometer (Gardner et al., 1985) was attached to the wire above the CTD (nephelometer data not included in this data submission). Although many papers were published based on HEBBLE data (including Gardner et al., 1985, which made the first and only evaluation of particle concentrations from a transmissometer and a Lamont nephelometer using simultaneous profiles through the water column and a three-month time series on a bottom tripod) no electronic copies of the KN74 CTD/Transmissometer data were preserved. The data survived only as tabular printouts made in the late 1970’s from now lost magnetic tape. Because of the uniqueness of the record-high particulate matter concentrations, with ambient current velocities of up to 70 cm/sec near the seafloor, it was important to rescue and preserve these data. Attempts to scan and apply OCR to the data with standard copying/scanning machines proved futile. Texas A&M University Library Digital Service Center (https://library.tamu.edu/services/print_scan_copy.html) scanned our 685 pages of tables using an advanced Supra Scan Quartz A00-Cam Quartz HD scanner, utilizing ABBYY Fine Reader OCR and PDF software (https://www.abbyy.com/en-us/finereader/), which is more frequently used in the humanities for digital preservation and conservation. Final scans were markedly better, but still contained many errors because of low quality originals. Two students (Rebecca Gray Thomas and Kenna Nolen) performed QA/QC of the 685 pages of data. Through tedious effort, they successfully corrected the data, thus making it possible to load data into a database management system to visualize and analyze data profiles, make maps and sections, perform and publish further scientific analyses, and submit data to publicly accessible archives for preservation and use by future generations. Data are in text format.

    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.

    Downloads & Resources

    Dates

    Metadata Date 2025-01-22T13:12:47Z
    Metadata Created Date December 4, 2020
    Metadata Updated Date March 1, 2025
    Reference Date(s) July 3, 2019 (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 2025-01-22T13:12:47Z
    Metadata Created Date December 4, 2020
    Metadata Updated Date March 1, 2025
    Reference Date(s) July 3, 2019 (publication)
    Responsible Party (Point of Contact)
    Contact Email
    Guid gov.noaa.nodc:0189618
    Access Constraints Cite as: Gardner, Wilford D.; Richardson, Mary Jo; Mishonov, Alexey V. (2019). Water temperature, salinity, beam attenuation, and other parameters from CTD from the research vessel Knorr in the Western North Atlantic from 1979-09-09 to 1979-10-01 (NCEI Accession 0189618). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0189618. 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 -59.04
    Bbox North Lat 42.19
    Bbox South Lat 39.02
    Bbox West Long -65.49
    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:0189618
    Graphic Preview Type PNG
    Harvest Object Id 1d669345-221e-4ff5-b1e2-1482964c04b8
    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": [[[-65.49, 39.02], [-59.04, 39.02], [-59.04, 42.19], [-65.49, 42.19], [-65.49, 39.02]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1979-09-09
    Temporal Extent End 1979-10-01

    Didn't find what you're looking for? Suggest a dataset here.