Nivel Promedio del Mar

Source: NOAA, Center for Operational Oceanographic Products and Services

The term Mean Sea Level (MSL) can also refer to a tidal datum, or frame of vertical reference defined by a specific phase of the tide.

  • Tidal datums are locally-derived based on observations at a tide station, and are typically computed over a 19-year period, known as the National Tidal Datum Epoch (NTDE). The present 19-year reference period used by NOAA is the 1983-2001 NTDE.
  • Tidal datums must be updated at least every 20-25 years due to global sea level rise.
  • Tidal datums are the basis of marine boundaries, are used as a vertical reference plane in producing nautical charts, and provide important baseline information for observing changes in sea level over time. MSL as a tidal datum is computed as a mean of hourly water level heights observed over 19-years.

Monthly means are generated in the datum calculation process, which are used to generate the relative local sea level trends observed here.

Data and Resources

Additional Info

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Last Updated July 3, 2018, 15:14 (UTC)
Created August 9, 2017, 20:36 (UTC)