Concept
Covariance over longitude of northward wind and air temperature
| URI | http://vocab.nerc.ac.uk/standard_name/covariance_over_longitude_of_northward_wind_and_air_temperature/ | ||
|---|---|---|---|
| Within Vocab | Climate and Forecast Standard Names | ||
| Definition | Covariance refers to the sample covariance rather than the population covariance. The quantity with standard name covariance_over_longitude_of_northward_wind_and_air_temperature is the covariance of the deviations of meridional air velocity and air temperature about their respective zonal mean values. The data variable must be accompanied by a vertical coordinate variable or scalar coordinate variable and is calculated on an isosurface of that vertical coordinate. "Northward" indicates a vector component which is positive when directed northward (negative southward). Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name "upward_air_velocity"). Air temperature is the bulk temperature of the air, not the surface (skin) temperature. It is strongly recommended that a variable with this standard name should have the attribute units_metadata="temperature: difference", meaning that it refers to temperature differences and implying that the origin of the temperature scale is irrelevant, because it is essential to know whether a temperature is on-scale or a difference in order to convert the units correctly (cf. https://cfconventions.org/cf-conventions/cf-conventions.html#temperature-units). | ||
| Date | None | ||
| Note | accepted | ||
| modified | 2024-05-20 20:39:49.0 | ||
| Exact Match | http://mmisw.org/ont/cf/parameter/covariance_over_longitude_of_northward_wind_and_air_temperature | ||
| http://vocab.nerc.ac.uk/standard_name/covariance_over_longitude_of_northward_wind_and_air_temperature/ | |||
P07:DOBXIY2Y |
covariance_over_longitude_of_northward_wind_and_air_temperature | ||
| Related | P06:KMTS |
Kelvin metres per second | |
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