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Geopotential height differs from geometric height (as given by a tape measure) because Earth's gravity is not constant, varying markedly with altitude and latitude; thus, a 1-m geopotential height difference implies a different vertical distance in physical space: "the unit-mass must be lifted higher at the equator than at the pole, if the same amount of work is to be performed". [2]
Table 1-5 gives the standard temperature, pressure, and density as a function of geopotential height H above sea level. Temperature variations are linear between key altitudes indicated in boldface. Standard-atmosphere temperature is plotted in Figure 1.10. Below a geopotential altitude of 51 km, eqs.
Oct 24, 2024 · The Basics: Defining Geopotential Height. Geopotential height is defined as the height above sea level that a pressure level would have if the earth’s gravity field were uniform. In essence, it is a measure of the gravitational potential energy of a unit mass relative to sea level. It is usually expressed in meters or feet and is used as a ...
Mar 29, 2024 · Geopotential height. The height of a given point in the atmosphere in units proportional to the potential energy of unit mass (geopotential) at this height relative to sea level. where g is the acceleration of gravity and g0 is the globally averaged acceleration of gravity at sea level (g0 = 9.806 65 m s −2), so that the two heights are ...
Jan 19, 2024 · The medium atmospheric pressure at sea level is 1013.25 hPa. 1013.25 - 500 = 513.25 hPa, which is close to 500 hPa, but is not the same. The medium atmospheric pressure at sea level is a universal constant, not dependent on the place. Oh, sorry, of course, it IS dependent, but only if we count with precision, far than unreachable by meteorology ...
The 1000 to 500 mb thickness is a function of two properties, (1) the average temperature of the air between 1000 and 500 millibars and (2) the average moisture content of the air between 1000 and 500 millibars. These two properties are combined together to produce the virtual temperature.
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All Heights Based on Geopotential Number (C P) The geopotential number is the potential energy difference between two points g = local gravity W O = potential at datum (geoid) W P = potential at point Why use Geopotential Number? - because if the GPN for two points are equal they are at the same potential and water will not flow between them 0 ...
