Sea Levels Online: Sea Level Variations of the United States Derived from National Water Level Observation Network Stations

Metadata Updated: September 6, 2016

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 128 stations of the National Ocean Service's (NOS) National Water Level Observation Network (NWLON) having between 30 and 146 years of data. The sea level variations determined are the linear trend, the average seasonal cycle, and the interannual variability at each station. Monthly data up to the end of 2006 were used in the calculation and all stations had data spanning a period of 30 years or more. Since the derived trends include the local vertical land motion, they are spatially variable. Calculated MSL trends range from 9.85 mm/yr for Grand Isle, LA to -16.68 mm/yr for Skagway AK, and are consistent with previous trends published by NOS. Available data from this project include time series plots 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 which was obtained after accounting for the average seasonal cycle; the seasonal cycle; the Interannual variation of mean sea level for all data to 2006; and the Interannual variation from 1980 to the present (updated monthly). 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.

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Dates

Metadata Date August 23, 2016
Metadata Created Date September 26, 2015
Metadata Updated Date September 6, 2016
Reference Date(s) (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date August 23, 2016
Metadata Created Date September 26, 2015
Metadata Updated Date September 6, 2016
Reference Date(s) (publication)
Responsible Party National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Operational Oceanographic Products and Services (CO-OPS) (Point of Contact)
Contact Email
Access Constraints Use Constraints: None, Access Constraints: None
Bbox East Long 180.0
Bbox North Lat 61.24
Bbox South Lat -14.28
Bbox West Long -180.0
Coupled Resource
Frequency Of Update asNeeded
Guid
Harvest Object Id 3cae1a3d-d284-4af3-836c-eb84b090ce28
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Licence Monthly mean sea level (MSL) variations were analyzed for 128 stations of the National Ocean Service's (NOS) National Water Level Observation Network (NWLON) having between 30 and 146 years of data to obtain the linear trend, the average seasonal cycle, and the interannual variations. 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 uniform 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.
Metadata Language
Metadata Type geospatial
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1854-01-01

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