Atmosphere Which one of the following conditions is true for sub-adiabatic lapse rate? ans. ELR ≅ 0 DALR = ELR DALR < ELR DALR > ELR
Question
Atmosphere
Which one of the following conditions is true for sub-adiabatic lapse rate? ans. ELR ≅ 0
DALR = ELR
DALR < ELR
DALR > ELR
Solution
The correct condition for sub-adiabatic lapse rate is DALR < ELR.
Explanation: The Dry Adiabatic Lapse Rate (DALR) is the rate at which the temperature of a parcel of dry air decreases as it ascends in the atmosphere under adiabatic conditions (no heat is added or removed from the parcel). The Environmental Lapse Rate (ELR) is the actual rate at which temperature decreases with altitude in the atmosphere.
In a sub-adiabatic lapse rate condition, the environmental lapse rate is less than the dry adiabatic lapse rate. This means that the temperature of the surrounding environment decreases more slowly with altitude than a rising parcel of dry air would. This condition is stable and inhibits vertical motion.
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