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    • Sea Level Trends: Sea Level Variations of the United States Derived from National Water Level Observation Network Stations

    Metadata Updated: March 13, 2024

    Water level records are a combination of the fluctuations of the ocean and the vertical land motion at the location of the station. Monthly mean sea level (MSL) variations were analyzed for the stations of the National Ocean Service's (NOS) National Water Level Observation Network (NWLON) having at least 30 years of data. The sea level variations determined are the relative sea level trend, the average seasonal cycle, and the interannual variability at each station. Since the derived trends include the local vertical land motion, they are spatially variable. The relative sea level trend plots include the time series for each station of the monthly MSL with the seasonal cycle removed, a 5-month average, and the linear trend with its 95% confidence interval; the average seasonal cycle; the interannual variation of MSL. The plots are updated monthly and the long-term trend is recalculated every year. The location and timing of any major earthquakes near stations in tectonically-active areas are noted since an associated vertical offset or a change in MSL trend is possible.

    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 February 29, 2024
    Metadata Created Date November 12, 2020
    Metadata Updated Date March 13, 2024
    Reference Date(s) 1854 (creation), 2018 (revision), 2001 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NOS CO-OPS

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date February 29, 2024
    Metadata Created Date November 12, 2020
    Metadata Updated Date March 13, 2024
    Reference Date(s) 1854 (creation), 2018 (revision), 2001 (publication)
    Responsible Party (Point of Contact, Custodian)
    Contact Email
    Guid gov.noaa.nmfs.inport:37628
    Category Tag 16E15F51 D96E 4051 9124 75665Abdc6Ff ["Coastal Flooding","Ecosystem Vulnerability","Atmospheric, Earth and Ocean Sciences"]
    Access Constraints Cite As: Center for Operational Oceanographic Products and Services, [Date of Access]: Sea Level Trends: Sea Level Variations of the United States Derived from National Water Level Observation Network Stations [Data Date Range], https://www.fisheries.noaa.gov/inport/item/37628., Access Constraints: None, Use Constraints: None, Distribution Liability: Recorded water levels are a combination of changes in the sea level and the vertical land motion at the location of the gauge. Therefore, the trends derived are relative MSL trends and can be considered valid only for a region near the gauge with similar vertical land motion. Calculation of absolute MSL trends requires the accurate determination of vertical land motion at the gauges and was beyond the scope of this project.
    Bbox East Long 180
    Bbox North Lat 61.24
    Bbox South Lat -14.28
    Bbox West Long -180
    Coupled Resource
    Frequency Of Update asNeeded
    Harvest Object Id 1a677062-22f6-480e-a5d6-1c9de98ad731
    Harvest Source Id 217272a2-c20f-4b9e-a0e1-e42a6d539971
    Harvest Source Title NOS CO-OPS
    Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
    Lineage
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-180.0, -14.28], [180.0, -14.28], [180.0, 61.24], [-180.0, 61.24], [-180.0, -14.28]]]}
    Progress onGoing
    Spatial Data Service Type
    Spatial Reference System EPSG::4269
    Spatial Harvester True
    Temporal Extent Begin 1854

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