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Flashcards in Cloud Formation and Precipitation Deck (39)
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1

what is the adiabatic principle?

as a gas expands it cools down, as it is compressed it warms up

2

as a gas ________ it cools down

expands

3

what happens when a gas expands?

it cools down.

4

as a gas ________ it warms up

compresses

5

when a gas compresses it...

warms up

6

the temperature change of gas is based solely on __________

increase or drecrease of pressure

7

in the atmosphere as you increase in _________ the ________ decrease

altitude, pressure

8

what happens when you increase in altitude?

pressure drops

9

why doe pressure drop when you increase in altitude?

you have less atmosphere above you

10

as air rises it....

expands and cools down

11

as air sinks it..

is compressed and warms

12

what is the dry adiabatic rate?

as dry air raises it cools at a particular rate, 10 celsius per 1000m

13

what is the wet adiabatic rate?

if you have a wetter parcel of air and it rises it cools down at a slower rate. 5 celsius per 1000m

14

why does wet air cool slower?

because all of the moisture in that air is condensing as it cools down and the process of condensation release heat

15

the wet adiabatic rate increases....

condensation

16

an increase of condensation in the atmosphere causes what to form?

clouds

17

_____ air has to rise higher then ______ air in order for clouds to form

dry, wet

18

clouds form when water vapor ______ in rising air parcels

condenses

19

condensation requires...

the presence of particles (like dust) suspended int he air

20

what are the presence of parties suspended in the air called?

condensation nuclei

21

what do condensation nuclei allow the air to do?

glom on to nuclei and form coherent rain or water droplets.

22

what are the four families clouds are grouped into?

high, middle, low, and clouds with vertical development

23

what are the two classes of clouds?

stratiform, cumuliform

24

what are the two classes of clouds based on...

their shape

25

stratiform are ______ clouds

layered

26

cumuliform are _________ clouds

globular

27

moisture-laden clouds release moisture as...

precipitation

28

in order to form precipitation there must be something that..

causes air to rise int he atmosphere so that it cools down enough to reach its dew point

29

what are the four ways that air moves upward to form precipitation

1. orographic precipitation
2. convectional precipitation
3. cyclonic precipitation
4. convergence

30

how does orographic precipitation occur?

when air is forced to move up because of the presence of a mountain