sea-level pressure


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sea-level pressure

[′sē ¦lev·əl ‚presh·ər]
(meteorology)
The atmospheric pressure at mean sea level, either directly measured or, most commonly, empirically determined from the observed station pressure.

sea-level pressure

The atmospheric pressure that exists at sea level. It is used as a common reference for analysis of surface-pressure patterns. It can be measured by stations located at sea level or determined from charts showing the station pressure and temperature taken at stations not at sea level. In a standard atmosphere, its value is 29.92 in of mercury, 760 mm, or 1013.2 hectopascals.
References in periodicals archive ?
The NAM provides an index of sea-level pressure variations, and it can be approximated by zonally averaged winds near ~55[degrees]N.
One special feature of our aircraft SJ30 is that even at 41,000 feet the pressure inside the cabin is the same as the sea-level pressure.
The CSM model had the most extensive set of archived variables, including a full set of temperature variables (daily mean, maximum, and minimum temperatures) and two measures of pressure, surface pressure (PS) and sea-level pressure (SLP).
A more comprehensive picture of the change in the atmospheric pattern is presented by considering the leading empirical orthogonal function (EOF) of sea-level pressure variation for the Northern Hemisphere.
6 percent of sea-level pressure on Earth, it would spontaneously boil and evaporate.
The El NiEo phenomenon occurs when the east and central Pacific seas' surface temperatures become warmer than usual, which often signals wide-scale climate change around the globe, affecting winds, precipitation, sea-level pressures and temperatures.