mean sea level


Also found in: Dictionary, Thesaurus, Acronyms, Wikipedia.

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 ?
The ARC System Core Technology is designed to provide multiple wide area wireless telecommunications services from a lighter-than-air (LTA) platform suspended 1,000 to 5,000 meters above mean sea level by a tethered aerostat.
The five wells, Lagia 11, 12, 13, 14 and 15 will be targeting the main producing reservoir, the Nukhul formation at approximately 1500 feet below mean sea level.
The lake will be lowered 3 feet, from 396 feet above mean sea level to 393 feet above mean sea level.
They are the sea surface temperatures over North Atlantic and South Indian Oceans, East Asia mean sea level pressure, North- west European land surface air temperature and Equatorial Pacific warm water volume.
Much of the land of ice-covered Europe and North America was actually below mean sea level when the ice retreated, which is the case today with much of the land surfaces of Greenland's and Antarctica under ice caps.
En route to the initial approach fix at 10,000 feet Mean Sea Level, while dumping gas and flying radar trail in the weather at night, the indicated airspeed on both the heads up display and electronic altitude display indicator decreased to 14 knots indicated air speed.
At the time of Christ, the mean sea level was 9ft higher than it is today (DT Pugh: Tides, Surges and Mean Sea Level) and the church of the earliest religious community in Britain, in the 2nd century AD, where Glastonbury Abbey is now, stood on an island at high tide, known as the Isle of Avalon.
This product enhancement also captures the elevation of landscapes above mean sea level, in meters or feet, at multiple altitude points.
He initiated a "knock-it-off" and climbed to 3,500 feet Mean Sea Level where he analyzed the situation and determined that the right side hydraulic system failure was accompanied by a right engine flameout.
The new facility will rise to 1,142 feet above mean sea level, and tests indicate it will provide signal coverage equal to 97-98% of the coverage from atop the World Trade Center, according to the Dursts.
The FAA proposes to increase the Class E airspace at Puerto Rico, PR to include the airspace within Warning Areas W-370A, W-373A and W-373C in order to facilitate the handling and increase the safety of US military aircraft returning to Roosevelt Roads Naval Station below 5,500ft mean sea level.
The report said that there is high confidence that this human influence led to the oceans warming, which melted the snow and ice, and raised global mean sea level and changed some climate extremes in the second half of the 20th century.