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

    • Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations from Canadian Coast Guard Ship John P. Tully in the North Pacific Ocean, coastal upwelling region west of Vancouver Island, Canada from 1998-07-15 to 1998-07-23 (NCEI Accession 0207315)

    Metadata Updated: December 1, 2025

    This dataset includes chemical, discrete samples and profile observations data collected from Canadian Coast Guard Ship John P. Tully in the North Pacific Ocean, coastal upwelling region west of Vancouver Island, Canada from 1998-07-15 to 1998-07-23. These data include dissolved inorganic carbon (DIC), total alkalinity (TA), temperature, salinity, dissolved oxygen, silicate, nitrate and phosphate. The inner-shelf buoyancy current, the outer-shelf and the slope regions are contrasted for both wind regimes (up- and downwelling). Results show strong biological drawdown of the partial pressure of carbon dioxide (pCO2) in response to upwelling over the outer-shelf. In contrast, measured pCO2 is exceptionally high (pCO2>1000ppm) in the inner-shelf current, where biological uptake of carbon is consistently large. The biological C:N uptake ratio appears to increase when nitrogen becomes limiting (during downwelling), while the POC:PON ratio is relatively constant (slightly lower than the Redfield ratio) suggesting that excess carbon uptake does not go into the POC pool. As expected, large cells dominate where measured primary productivity is greatest. Sub-surface inorganic carbon (and pCO2) is high over the shelf. We suggest that carbon concentrations may be higher in coastal waters because of remineralization associated with high productivity that is confined to a smaller volume of water by bathymetry. At the coast these sub-surface concentrations are more efficiently mixed into the surface (especially during winter) relative to deeper offshore regions. Thus, despite high primary production, coastal waters may not aid in sequestration of atmospheric carbon.

    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 2025-11-25T12:56:13Z
    Metadata Created Date December 4, 2020
    Metadata Updated Date December 1, 2025
    Reference Date(s) December 4, 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 2025-11-25T12:56:13Z
    Metadata Created Date December 4, 2020
    Metadata Updated Date December 1, 2025
    Reference Date(s) December 4, 2019 (publication)
    Responsible Party (Point of Contact)
    Contact Email
    Guid gov.noaa.nodc:0207315
    Access Constraints Cite as: Ianson, Debby; Allen, Susan E.; Harris, Shannon L.; Orians, Kristin J.; Varela, Diana E.; Wong, C. S. (2019). Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations from Canadian Coast Guard Ship John P. Tully in the North Pacific Ocean, coastal upwelling region west of Vancouver Island, Canada from 1998-07-15 to 1998-07-23 (NCEI Accession 0207315). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/bfqg-z806. 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 -124.73
    Bbox North Lat 49.36
    Bbox South Lat 48.02
    Bbox West Long -127.03
    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:0207315
    Graphic Preview Type PNG
    Harvest Object Id f561757a-4e34-47b7-bfb1-70b5970d459c
    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": [[[-127.03, 48.02], [-124.73, 48.02], [-124.73, 49.36], [-127.03, 49.36], [-127.03, 48.02]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1998-07-15
    Temporal Extent End 1998-07-23

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