mean sea level


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mean sea level

[′mēn ′sē ‚lev·əl]
(oceanography)
The average sea surface level for all stages of the tide over a 19-year period, usually determined from hourly height readings from a fixed reference level.

mean sea level

The average height of the surface of the sea for all stages of the tide. It is used as a reference for elevations. Usually, it is determined by averaging the height readings observed hourly over a minimum period of nineteen years. Also called sea-level datum.
References in periodicals archive ?
Measure of "actual" mean sea level (MSL) is complicated by geological movement of the reference point.
It is not easy to estimate the height of global mean sea level directly, because dense and uniform observations are needed for entire oceans.
Thereby, the mean sea level and maximum sea level for Estonia were calculated as the mean for four stations (Parnu, Narva-Joesuu, Rohukula, Ristna) during 1950-2011.
This report exposed historical trends of global mean sea level from tide gauge records and the average sea level from global satellite measurements (Figure 1.
Figure 2 shows the anomaly of mean sea level pressure in the selected cases for the representative point.
Over the past century, the warming climate has pushed up mean sea level four to eight inches worldwide, and computer models suggest that this rise will probably accelerate, according to a 2001 report of the U.
Illustrated throughout with b&w pictures, graphs, and sketches, it covers such topics as world weather patterns, wind speed, and the mean sea level prognosis.
have built up over several thousand years as mean sea level has risen.
Air Force cargo aircraft at release altitudes of 500 to 1,250 feet above ground level for low-velocity airdrop and 15,000 to 25,000 feet mean sea level for high-velocity airdrop with identical load accuracy and survivability.
Thus, some papers are devoted to satellite missions, where an interesting experiment for altimeter calibration of satellites TOPEX and JASON-1 is reported in one paper, which is then applied for geoid determination as well as for mean sea level studies in the Mediterranean sea.
WABC-TV has signed a lease agreement to join television and FM radio stations utilizing the new 385-foot-high transmission tower atop Four Times Square in Manhattan, at an elevation of 1168 feet above mean sea level (AMSL).
These calculated values were then used in a separate equation to calculate the storm surge expected at both high and low astronomical tide for a specific location in Charleston, South Carolina based on the sites' elevation above mean sea level, for a variety of landfall possibilities.