Concept
Product of lagrangian tendency of air pressure and geopotential height
| URI | http://vocab.nerc.ac.uk/standard_name/product_of_lagrangian_tendency_of_air_pressure_and_geopotential_height/ | ||
|---|---|---|---|
| Within Vocab | Climate and Forecast Standard Names | ||
| Definition | The phrase "product_of_X_and_Y" means X*Y. The phrase "tendency_of_X" means derivative of X with respect to time. The Lagrangian tendency of a quantity is its rate of change following the motion of the fluid, also called the "material derivative" or "convective derivative". The Lagrangian tendency of air pressure, often called "omega", plays the role of the upward component of air velocity when air pressure is being used as the vertical coordinate. If the vertical air velocity is upwards, it is negative when expressed as a tendency of air pressure; downwards is positive. Air pressure is the force per unit area which would be exerted when the moving gas molecules of which the air is composed strike a theoretical surface of any orientation. Geopotential is the sum of the specific gravitational potential energy relative to the geoid and the specific centripetal potential energy. Geopotential height is the geopotential divided by the standard acceleration due to gravity. It is numerically similar to the altitude (or geometric height) and not to the quantity with standard name height, which is relative to the surface. | ||
| Date | None | ||
| Note | accepted | ||
| modified | 2019-06-17 13:47:18.0 | ||
| Exact Match | http://mmisw.org/ont/cf/parameter/product_of_lagrangian_tendency_of_air_pressure_and_geopotential_height | ||
| http://vocab.nerc.ac.uk/standard_name/product_of_lagrangian_tendency_of_air_pressure_and_geopotential_height/ | |||
| P07 Climate and Forecast Standard Names - (2) | |||
| Related | P06:PAMS |
Pascal metres per second | |
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