Concept
ertel_potential_vorticity
| URI | http://vocab.nerc.ac.uk/collection/P07/current/CFSN0620/3/ | ||
|---|---|---|---|
| Within Vocab | Climate and Forecast Standard Names | ||
| Alternative Labels | |||
| Definition | The Ertel potential vorticity is the scalar product of the atmospheric absolute vorticity vector and the gradient of potential temperature. It is a conserved quantity in the absence of friction and heat sources [AMS Glossary, http://glossary.ametsoc.org/wiki/Ertel_potential_vorticity]. A frequently used simplification of the general Ertel potential vorticity considers the Earth rotation vector to have only a vertical component. Then, only the vertical contribution of the scalar product is calculated. 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 | 2024-05-20T20:39:49 | ||
| Identifier | SDN:P07::CFSN0620 | ||
| Note | accepted | ||
| Is Version Of | CFSN0620 | ||
| Previous Version | 1 , 2 | ||
| version | 3 | ||
| Same As | MMI | http://mmisw.org/ont/cf/parameter/ertel_potential_vorticity | |
| CF | http://vocab.nerc.ac.uk/standard_name/ertel_potential_vorticity/ | ||
| Broader | P04:G254 |
EARTH SCIENCE > Atmosphere > Atmospheric Winds > Vorticity | |
P64:G254 |
EARTH SCIENCE > Atmosphere > Atmospheric Winds > Vorticity | ||
| Related | P04:G985 |
EARTH SCIENCE > Oceans > Ocean Winds > Vorticity | |
P64:G985 |
EARTH SCIENCE > Oceans > Ocean Winds > Vorticity | ||
P06:KMSS |
Kelvin square metres per kilogram per second | ||
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