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

Try the next-generation Data Catalog at catalog-beta.data.gov and help shape it with your feedback.

  • Feedback

    • Total alkalinity, pH, dissolved oxygen, and other variables collected from time series observations using alkalinity titrator, pH electrode, oxygen optode and other instruments in a shallow back reef on Ofu, American Samoa from 2011-11-12 to 2012-03-27 (NCEI Accession 0127952)

    Metadata Updated: March 5, 2026

    This dataset consists of time series of physical and biogeochemical data from 8 locations (8 tubes) in Pool 100 as well as temperature time series from Pool 300, an adjacent back reef Pool. The 8 tubes are polypropylene tubes that are strung out onto the reef in order to pump water to beachside instrumentation. Therefore, sampling from the tubes defines the edges of a 3-dimensional sampling box 14 m in width by 40 m in length from which water was sampled from all 8 edges continuously for ~1 week. Later, we collected temperature data from Pool 300 as described above. The phrase "Pool" is another term for back reef environment that is used commonly when referring to Ofu's coral reefs (hence the use of the phrase Pool in the paper and in its accompanying data set). There are three data files associated with this archival package. All data files are in MATLAB format. If you require a different data format, please contact dkoweek@stanford.edu to discuss your data needs. 1. Short-term physical oceanographic data from Pool 100 (data in Fig. 2 of the paper) 2. Long-term temperature time series from Pool 300 back reef and offshore (data in Fig. 3e of the paper) 3. Biogeochemical data from Pool 100 (data in Figs. 4-6 of the paper). Citation information of the paper: Koweek, D.A., R.B. Dunbar, S.G. Monismith, D.A. Mucciarone, C.B. Woodson, L. Samuel High-resolution physical and biogeochemical variability from a shallow back reef on Ofu, American Samoa: an end-member perspective accepted in Coral Reefs (2015)

    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 2025-04-03T22:12:39Z
    Metadata Created Date December 4, 2020
    Metadata Updated Date March 5, 2026
    Reference Date(s) May 14, 2015 (publication), May 12, 2015 (creation)
    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 2025-04-03T22:12:39Z
    Metadata Created Date December 4, 2020
    Metadata Updated Date March 5, 2026
    Reference Date(s) May 14, 2015 (publication), May 12, 2015 (creation)
    Responsible Party (Point of Contact)
    Contact Email
    Guid gov.noaa.nodc:0127952
    Access Constraints Cite as: Koweek, David A.; Dunbar, Robert B.; Monismith, Stephen G.; Mucciarone, David A.; Woodson, C. Brock; Samuel, Lianna (2015). Total alkalinity, pH, dissolved oxygen, and other variables collected from time series observations using alkalinity titrator, pH electrode, oxygen optode and other instruments in a shallow back reef on Ofu, American Samoa from 2011-11-12 to 2012-03-27 (NCEI Accession 0127952). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0127952. 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 -169.66
    Bbox North Lat -14.183
    Bbox South Lat -14.185
    Bbox West Long -169.666
    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:0127952
    Graphic Preview Type PNG
    Harvest Object Id 453b5f40-b65f-45bd-bc2c-4e4ec9b4b240
    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": [[[-169.666, -14.185], [-169.66, -14.185], [-169.66, -14.183], [-169.666, -14.183], [-169.666, -14.185]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2011-11-12
    Temporal Extent End 2012-03-27

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