Exner function
Encyclopedia
The Exner function is an important parameter in atmospheric modeling. The Exner function can be viewed as non-dimensionalized pressure and can be defined as:
where
is the pressure at the surface, usually taken as 1000 hPa; 
is the gas constant for dry air; and 
is the heat capacity of dry air at constant pressure.
where
is the pressure at the surface, usually taken as 1000 hPa; is the gas constant for dry air; and is the heat capacity of dry air at constant pressure.See also
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