Discussion
State whether the following is true or false.
An atmosphere in which the environmental lapse rate exceeds the dry adiabatic rate is absolutely unstable.
Answer: A
Correct answer: True
If the environment cools with height faster than a rising dry parcel does, then any parcel displaced upward finds itself warmer than its surroundings and keeps rising, whether it is saturated or not. That is absolute instability, and it is why such lapse rates are found only in shallow layers near a strongly heated surface - convection removes them as fast as they form.
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