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    • PAR-GWR-CARB: A monthly gridded surface carbonate system data product for the Pacific-Arctic Region from 1982-2021 (NCEI Accession 0292960)

    Metadata Updated: September 2, 2025

    The Pacific-Arctic Region (PAR) is highly sensitive to ocean acidification, yet data gaps in the carbonate system record persist due to the region's remote nature and environmental factors such as sea ice. To address these gaps, we utilized a geographically-weighted regression (GWR) to predict surface total alkalinity using salinity and temperature data at a monthly 1°x1° resolution. The GWR methodology, which allows regression coefficients to vary spatially, accounts for local factors such as riverine discharge, sea ice melt, primary productivity, and other influences on alkalinity. This approach achieved a high degree of accuracy, with an R² of 0.93, a mean absolute error (MAE) of 23 μmol/kg, and near-zero bias (mean bias error [MBE] of -0.01 μmol/kg), as validated by 10-fold cross-validation (N = 7,146). The derived regression coefficients were then applied to the Hadley EN4 salinity and OI SST temperature datasets to estimate total alkalinity. Subsequently, this total alkalinity dataset was integrated with the MPI-SOM-FFN surface pCO2 dataset to reconstruct the entire carbonate system (DIC, pH, [H⁺], Ω) from 1982 to 2021 at a monthly 1°x1° resolution.

    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 2025-05-29T15:34:17Z
    Metadata Created Date February 1, 2025
    Metadata Updated Date September 2, 2025
    Reference Date(s) May 31, 2024 (publication), April 15, 2025 (revision)
    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 2025-05-29T15:34:17Z
    Metadata Created Date February 1, 2025
    Metadata Updated Date September 2, 2025
    Reference Date(s) May 31, 2024 (publication), April 15, 2025 (revision)
    Responsible Party (Point of Contact)
    Contact Email
    Guid gov.noaa.nodc:0292960
    Access Constraints Cite as: Caero, Thomas V.; Wang, Hongjie; Jersild, Annika (2024). PAR-GWR-CARB: A monthly gridded surface carbonate system data product for the Pacific-Arctic Region from 1982-2021 (NCEI Accession 0292960). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/p35d-d778. 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 -103
    Bbox North Lat 90
    Bbox South Lat 45
    Bbox West Long 156
    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:0292960
    Graphic Preview Type PNG
    Harvest Object Id 0d00c5ce-7a23-4093-8505-0dbfb21ac583
    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": [[[156.0, 45.0], [-103.0, 45.0], [-103.0, 90.0], [156.0, 90.0], [156.0, 45.0]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1982-01-01
    Temporal Extent End 2021-12-31

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