mean sea level


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mean sea level

n.
The average level of the ocean's surface, calculated as the arithmetical mean of hourly tide levels taken over an extended period and used as the standard for determining terrestrial and atmospheric elevations and ocean depths.

mean sea level

n
(Surveying) (in the UK) the sea level used by the Ordnance Survey as a datum level, determined at Newlyn in Cornwall. See sea level

mean sea level

The average height of the surface of the sea for all stages of the tide; used as a reference for elevations. Also called MSL.
References in periodicals archive ?
However, over the altimeter era (1992-present), tide gauges show a rate of about 3 mm [yr.sup.-1], suggesting that global mean sea level has accelerated over the last century (e.g., Merrifield et al.
The full level of the dam is 2,404 feet.The water level is related to the Mean Sea Level and the catchment area.
Overall, the researchers predicted that by 2100, a 1.5 degree temperature increase will drive the global mean sea level up by 19 inches (48 centimeters, 90 percent credible interval of 28--82 cm), while a 2.0 degree increase will raise oceans by 22 inches (56 cm, 90 percent credible interval of 28--96 cm), and a 2.5 degree increase will raise sea level by 23 inches (58 cm, 90 percent credible interval of 37--93 cm).
This well was drilled with the semi-submersible drilling rig Leiv Eiriksson to a total depth of 1,275 metres below mean sea level and in a water depth of 450 metres.
Tidal gauges at Owase on the eastern shore record a drop in mean sea level at a rate of 0.44 feet per 100 years (1.3 mm/year), while those in Hamada on the west coast log a rise at a rate of 1.68 feet per century (5.1 mm/year).
NASA puts the current rise of global mean sea level at (https://sealevel.nasa.gov/) 3.4 mm per year , and rising while the National Oceanic and Atmospheric Administration put global rise at (https://www.climate.gov/news-features/understanding-climate/climate-change-global-sea-level) around 3.2 mm per year .
The solar activity affects all surface geosystems, including weather and climate indices, winds, rains, snow covers, mean sea level, river streamflows and other hydrological cycles.
The report, "Global and Regional Sea Level Rise Scenarios for the United States," showed that at the highest end of the spectrum, the global mean sea level could rise by eight feet by 2100.
The height of every point in Britain is taken from mean sea level - halfway between low and high tides - as measured by a gauge at Newlyn, Cornwall, but those used by OS were taken from 1915-21.
The Ordnance Survey (OS) uses mean sea level as the starting point for measuring the absolute height of mountains and rising seas have put several UK peaks at risk.
The Mangla Dam is filled to its maximum storage level of 1242 feet above the mean sea level prompting project authorities to strictly follow the criterion jointly devised by all stakeholders to fill the reservoir, source said to research analyst-PAGE.