atpl/oxford/met/ch7 Flashcards
If the ELR is 0.65°C/100m
Atmosphere is stable when dry
ELR is 1°C/100m
Neutral when dry
Why does air cool as it rises?
It expands
From which of the following can the stability of the atmosphere be determined?
ELR
When the upper part of a layer of warm air is advected:
Stability increases within the layer
The temperature at the surface is 15°C, the temperature at 1000m is 13°C. Is the atmosphere
Stable
Which of the following gives conditionally unstable conditions?
0.65°C/100m
A mass of unsaturated air is forced to rise till just under the condensation level. It then settles back to its original position
Temp. stays the same
What happens to the stability of the atmosphere in an inversion? (Temp increasing with height)
Absolutely stable
What happens to stability of the atmosphere in an isothermal layer? (Temp constant with height)
Absolutely stable
What is the effect of a strong low level inversion?
Turbulence
A layer of air can be
Conditional; unstable when saturated and stable when unsaturated
What happens to the temperature of a saturated air mass when forced to descend?
it heats up less than dry because of evaporation
In still air a lapse rate of 1.2°C/100m refers to:
ELR
What happens to the temperature of a saturated air mass when descending?
it heats up less than dry because of evaporation
