- Isobaric equivalent temperature: The temperature that an air parcel would have if all water vapor were condensed at constant pressure and the enthalpy released from the vapor used to heat the air:
where Tie is the isobaric equivalent temperature, T the temperature, w the mixing ratio, L the latent heat, and cp the specific heat of air at constant pressure. This process is physically impossible in the atmosphere.
- Adiabatic equivalent temperature (also known as pseudoequivalent temperature): The temperature that an air parcel would have after undergoing the following process: dry-adiabatic expansion until saturated; pseudoadiabatic expansion until all moisture is precipitated out; dry- adiabatic compression to the initial pressure.
This is the equivalent temperature as read from a thermodynamic chart and is always greater than the isobaric equivalent temperature:where Tae is the adiabatic equivalent temperature.
Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact email@example.com. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.