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11: Atmosphere Motion - Dry Processes (DALR)

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Total cards: 12•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (12)

#1
Front (Question)

Form of Energy in the Atmosphere (4)

Back (Answer)

1) Electrical energy (Thunderstorms & lightning) 2) External kinetic energy (Winds) 3) Potential energy (Vertical motion) 4) Work done (Parcels expand as they rise) (Parcels contract as they sink)

#2
Front (Question)

Sources of energy available to parcel of air 3

Back (Answer)

1) Internal (kinetic) energy 2) External energy (via absorption of UV by O3) 3) External energy (via surface heating - close to surface)

#3
Front (Question)

Define Adiabatic

Back (Answer)

No external source of energy

#4
Front (Question)

Dry Adiabatic Lapse Rate (DALR) 1) Define 2) 1* C 3) 10* C

Back (Answer)

1) Rate at which temperature changes (no change of phase) 2) 1* C for every 100 m 3) 10 * C for every 1000 m

#5
Front (Question)

Environmental Lapse Rate Depending on the atmosphere, the parcel of air temperature will change. what happens when: 1) Warm 2) Cold 3) Same temp

Back (Answer)

1) Rise & due to buoyancy will cause unstable conditions 2) Sink - stable conditions 3) It wont move - neutral conditions

#6
Front (Question)

What determines atmospheric stability

Back (Answer)

The temperature of a parcel of air relative to the temperature of its surrounding environment

#7
Front (Question)

When does a neutral atmosphere occur

Back (Answer)

If actual lapse rate is exact equal to DALR

#8
Front (Question)

Unstable atmosphere calculation (DALR) 1) Atmosphere 20* C at surface 8* C, at 1 km 2) Parcel of air 20* C at surface 10* C, at 1 km What happens to the parcel of air?

Back (Answer)

Parcel (dry) warmer than environment & therefor rise

#9
Front (Question)

Stable atmosphere calculation (DALR) 1) Atmosphere 20* C at surface 13* C, at 1 km 2) Parcel of air 20* C at surface 10* C, at 1 km What happens to the parcel of air?

Back (Answer)

Parcel (dry) is cooler than environment & therefor sink

#10
Front (Question)

If the environment/actual lapse rate is greater than the DALR then…

Back (Answer)

Parcel (dry) is warmer than its surrounding environment = unstable conditions

#11
Front (Question)

If the environment/actual lapse rate is less than the DALR then…

Back (Answer)

Parcel (dry) is cooler than its surrounding environment = stable conditions

#12
Front (Question)

If the environment/actual lapse rate is equal than the DALR then…

Back (Answer)

Parcel & environment at the same temperature = neutral conditions