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Flashcards in Atmospheric Stability Deck (46)
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1

What 3 states can moisture exist?

-Liquid
-Solid
-Gas

2

What is the process of;
Gas to Solid?

Deposition

3

What is the process of;
Solid to Gas?

Sublimation

4

What is the process of;
Gas to Liquid?

Condensation

5

What is the process of;
Liquid to Gas?

Evaporation

6

What is the process of;
Solid to Liquid?

Melting

7

What is the process of;
Liquid to Solid?

Freezing

8

How is a change of state achieved?

Exchange of latent heat

9

What does humidity refer to?

Amount of water vapour contained in air sample

10

How is humidity measured?

Psychrometer

11

What is relative humidity expressed as?

Percentage

12

When is a sample of air said to be saturated?

When the air sample can hold no more water without condensation occurring

13

Relative humidity %=

Actual Mass of water x 100/ Mass of water vapour at saturation

14

What influences the amount of water being able to be held?

- Temperature
- Pressure

15

Increased temperature increases the stability of an air sample and is there for able to hold more or less water?

More

16

The relative humidity is decreased with....

An increase in temperature

17

What is dew point?

Temperature at which a sample of air must be cooled to reach saturation

18

As a parcel of air rises up through the atmosphere what happens to the surrounding air pressure?

Reduces

19

A parcel of air cools when it rises why is this?

The volume of parcels increases and the temperature reduces. Process called expansion

20

When an air sample changes temperature due to pressure or volume this is called?

Adiabatic

21

What is the lapse rate?

Lapse rate is the rate at which an air sample cools as it rises

22

What does the lapse rate depend on?

Whether the sample of air is dry or saturated

23

What is the lapse rate of unsaturated air?

3/1000ft
DALR

24

What is the lapse rate of saturated air?

1.5/1000ft
SALR

25

What causes saturated air to move more slowly?

As water vapour condenses to liquid, latent heat is released causing it to cool more slowly

26

What is the Dew point lapse rate?

.6/1000ft

27

What is considered a stable atmosphere?

One which an air parcel return to its original level after being forced vertically

28

What is the air said to be if it continues to rise on its own after being forced vertically?

Unstable

29

Stability or instability depends on?

Relative lapse rates and the air parcels being forced vertically

30

What is ELR?

Environmental Lapse Rate