MET Q8 - Stability Flashcards
If a parcel of unsaturated air is forced to ascend through an isothermal layer. Provided it remains unsaturated then the temperature of the parcel:
Select one:
a.Decreases at a rate of 0.65°C per 100m
b.Remains constant
c.Becomes equal to the temperature of the isothermal layer
d.Decreases at a rate of 1°C per 100m
d.Decreases at a rate of 1°C per 100m
If a parcel of unsaturated air becomes saturated when forced to ascend through an isothermal layer, the temperature of the parcel will
Select one:
1.become equal to the temperature of the isothermal layer
2.decrease at a rate of 1 degree C per 100m reducing to 0.6 degrees per 100m
3.decrease at a rate of 0.65 degrees C per 100m
4.increase at a rate of 0.65 degrees per 100m
2.decrease at a rate of 1 degree C per 100m reducing to 0.6 degrees per 100m
What is the effect on the stability of the atmosphere when the static air temperature decreases with height at a rapid rate?
Select one:
1.Atmospheric stability will remain constant
2.The atmospheric stability will increase
3.The atmospheric stability will increase due to daytime heating
4.Atmospheric stability will decrease
4.Atmospheric stability will decrease
How will a rising parcel of air be affected when the ELR is greater than 1 degree C per 100m?
Select one:
1.it will remain at the new altitude
2.it will become conditionally unstable
3.it will descend to its original altitude
4.it will ascend further
4.it will ascend further
For both saturated and unsaturated air, instability will occur when the
Select one:
1.dry adiabatic lapse rate is less than the saturated adiabatic lapse rate but greater than the environmental lapse rate
2.environmental lapse rate is greater than both the dry and saturated adiabatic lapse rates
3.environmental lapse rate is less than both the dry and saturated adiabatic lapse rates
4.environmental lapse rate is greater than the saturated adiabatic lapse rate but less than the dry adiabatic lapse rate
2.environmental lapse rate is greater than both the dry and saturated adiabatic lapse rates
What is the state of atmospheric stability when the temperature at 2000ft is +7 degrees C and at 5000ft is +1 degree C?
Select one:
1.Absolutely unstable
2.Conditionally unstable
3.Absolutely stable
4.Conditionally stable
2.Conditionally unstable
What is the state of atmospheric stability when the temperature at 2000ft is +15 degrees C and at 5000ft is +3 degrees C?
Select one:
1.Conditionally unstable
2.Absolutely stable
3.Absolutely unstable
4.Conditionally stable
3.Absolutely unstable
What is the state of atmospheric stability when the temperature at 2000ft is +11 degrees C and at 5000ft is +8 degrees C?
Select one:
1.Conditionally unstable
2.Conditionally stable
3.Absolutely unstable
4.Absolutely stable
4.Absolutely stable
A typical radiosonde temperature profile through a high pressure system over land at night is given below. What stability characteristics describe this layer?
1,400 m -4°C
1,200 m-2°C
1,000 m -2°C
800 m-3°C
600 m -4°C
400 m -5°C
200 m -5°C
0 m -4°C
Select one:
a.Absolute stability exists between 400 m and 1,400 m
b.Absolute instability exists between 0 m and 200 m followed by a brief isotherm.
c.Absolute stability exists between the surface and 1,200 m.
d.Conditional instability exists through the whole layer.
c.Absolute stability exists between the surface and 1,200 m.
The SALR in the lower atmosphere is less than the DALR because
Select one:
a.pressure decreases with height
b.saturated air is less dense than dry air
c.latent heat is released
d.latent heat is absorbed
d.latent heat is absorbed
