Equivalent temperature

Short description: Temperature of an air parcel drained from its moisture by adiabatic process

For other similar terms, see Physics:Apparent temperature.

Not to be confused with Planetary equilibrium temperature.

In atmospheric science, equivalent temperature is the temperature of air in a parcel from which all the water vapor has been extracted by an adiabatic process.

Air contains water vapor that has been evaporated into it from liquid sources (lakes, sea, etc...). The energy needed to do that has been taken from the air. Taking a volume of air at temperature T and mixing ratio of r, drying it by condensation will restore energy to the airmass. This will depend on the latent heat release as: Te≈T+Lvcpdr where:

* Lv : latent heat of evaporation (2400 kJ/kg at 25°C to 2600 kJ/kg at −40°C)
* cpd : specific heat at constant pressure for air (≈ 1004 J/(kg·K))

Tables exist for exact values of the last two coefficients.

## See also

* Wet-bulb temperature
* Potential temperature
* Atmospheric thermodynamics
* Equivalent potential temperature

## Bibliography

* M Robitzsch, Aequivalenttemperatur und Aequivalentthemometer, Meteorologische Zeitschrift, 1928, pp. 313-315.
* M K Yau and R.R. Rogers, Short Course in Cloud Physics, Third Edition, published by Butterworth-Heinemann, January 1, 1989, 304 pages. ISBN 9780750632157 ISBN 0-7506-3215-1
* J.V. Iribarne and W.L. Godson, Atmospheric Thermodynamics, published by D. Reidel Publishing Company, Dordrecht, Holland, 1973, 222 pages

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Meteorological data and variables

General|

* Adiabatic processes
* Advection
* Buoyancy
* Lapse rate
* Lightning
* Surface solar radiation
* Surface weather analysis
* Visibility
* Vorticity
* Wind
* Wind shear

Condensation|

* Cloud
* Cloud condensation nuclei (CCN)
* Fog
* Convective condensation level (CCL)
* Lifted condensation level (LCL)
* Precipitation
* Water vapor

Convection|

* Convective available potential energy (CAPE)
* Convective inhibition (CIN)
* Convective instability
* Convective momentum transport
* Conditional symmetric instability
* Convective temperature (Tc)
* Equilibrium level (EL)
* Free convective layer (FCL)
* Helicity
* K Index
* Level of free convection (LFC)
* Lifted index (LI)
* Maximum parcel level (MPL)
* Bulk Richardson number (BRN)

Temperature|

* Dew point (Td)
* Dew point depression
* Dry-bulb temperature
* Equivalent temperature (Te)
* Forest fire weather index
* Haines Index
* Heat index
* Humidex
* Humidity
* Relative humidity (RH)
* Mixing ratio
* Potential temperature (θ)
* Equivalent potential temperature (θe)
* Sea surface temperature (SST)
* Thermodynamic temperature
* Vapor pressure
* Virtual temperature
* Wet-bulb temperature
* Wet-bulb globe temperature
* Wet-bulb potential temperature
* Wind chill

Pressure|

* Atmospheric pressure
* Baroclinity
* Barotropicity
* Pressure gradient
* Pressure-gradient force (PGF)

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