environmental lapse rate

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environmental lapse rate

[in¦vī·ərn¦mənt·əl ′laps ‚rāt]
The rate of decrease of temperature with elevation in the atmosphere. Also known as atmospheric lapse rate.

environmental lapse rate (ELR)

environmental lapse rate (ELR)
The lapse rate in the surrounding air within which a volume of air is being lifted. The average rate is 2°C/1,000 ft. This should not be confused with dry adiabatic lapse rate (DALR) and saturated adiabatic lapse rate (SALR), in which the lapse rates are fixed. See also dry adiabatic lapse rate and saturated adiabatic lapse rate.
References in periodicals archive ?
During the afternoon it's common for the environmental lapse rate to approach the dry adiabatic lapse rate (DALR) in the first few thousand feet of the surface (left).
If the environmental lapse rate is small, the winds are light or there's an overcast sky, thermal turbulence can be eliminated.
Small environmental lapse rates or temperature inversions are the key to finding an altitude with little or no thermal turbulence.

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