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Flashcards in MET PRT01 Deck (58)
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1

The atmosphere is defined

a collection of gasses surrounding the earth held by gravity

(constant up to 60 km)

2

Gasses in the atmosphere

78% nitrogen 21% oxygen 0.95% argon

3

Troposphere is

poles: 8km
Avg: 11 km (45 lat)
Equator: 16

Temp defines tropopause height

upper boundry tropopause

4

Tropopause folds

40 N/S
55 N/S (polarfront)
60/70 N/S

5

tropopause temp

Poles: -50
Equator: -80

Increase with LAT

6

Stratosphere extends

up to 50km

and contains Ozon (O3)

7

Max Ozon presense

around 20-25 km around +20 degress

8

The mesospere extends

80-90 km

9

The Ionosphere extends

Kennely: 110 km
Heavyside: 160 km
Appleton: 250 km

10

ISA extends to

32 km (100000 feet)

11

ISA temp decrease up to

11 km (-56.5c)

12

ISA temp increase at

20 km

Warmed by Ozon

13

Above the tropopause, how does temperature vary with increasing altitude in the ICAO standard atmosphere?

Select one:

a. At first it decreases and then higher up it remains constant

b. Continually increases

c. Continually decreases

d. Remains constant then increases


d. Remains constant then increases

14

Which is true of the temperature at the tropopause?

Select one:

a. There is no significant difference with change of latitude

b. It is highest in middle latitudes

c. It is colder in tropical regions than in polar regions

d. It is higher in equatorial regions than in Polar Regions

c. It is colder in tropical regions than in polar regions

15

In mid-latitudes the stratosphere extends on average from:

Select one:

a. 85 km to more than 200 km

b. 0 km to 11 km

c. 11 km to 50 km

d. 50 km to 85 km

c. 11 km to 50 km

16

Warmfront stretches

Stratiform clouds: 600 nm
Precipitaion: 200/300 nm (fine rain/drizzle possible snow)

17

Coldfront slope...

1:80

18

Coldfront stretches

slope: 100/200 nm
precipitation: 50/100 nm

19

Warmfron slope...

1:150

20

Pressure lapse rate (warm air)

Decreases

21

Pressure lapse rate (cold air)

increases

22

Pressure in the atmosphere drecreases at a

Decreasing rate

23

QFF is ....

the barometric pressure at a location corrected to MSL using the prevailing TEMPERATURE

24

Isobars are which Q values?

QFF

the barometric pressure at a location corrected to MSL using the prevailing TEMPERATURE

25

A trough (isobaric trough) of low pressure is:

Select one:

a. A small low established within the circulation of another low.

b. An area where the pressure is lower than anywhere else in the area.

c. A centre of pressure
surrounded on all sides by higher pressure.

d. An extension or elongation of a low pressure system along an axis on each side of which pressure increases.

d. An extension or elongation of a low pressure system along an axis on each side of which pressure increases.

26

The ICAO standard Atmosphere, assumes that the sea level atmospheric pressure is?

Select one:

a. 1013.25 hPa and decreases with an increase in height.

b. 1013.25 hPa and increases with an increase in height.

c. 1013.25 hPa and falls to about half this value at 30,000 ft.

d. 1013.25 hPa and decreases with an increase in height up to the tropopause. Above the tropopause it remains constant.

a. 1013.25 hPa and decreases with an increase in height.

Pressure decreases with height at a decreasing rate. This rate is modified by air temperature.

27

What happens to the pressure at any given height above warm air compared to cold air?

Select one:

a. Greater

b. Depends on the pressure system.

c. Lower

d. The same.

a. Greater

28

In the upper part of the stratosphere the temperature:

Select one:

a. is almost constant

b. decreases with altitude

c. increases with altitude

d. increases at first and decreases afterward

c. increases with altitude

Above the tropopause and within the lower part of the stratosphere (11 km to 20 km)the temperature remains constant. However, the upper part of the stratosphere (from 20 km), the temperature increases with height due to the absorption of UV rays by Ozone.

29

In mid-latitudes the stratosphere extends on average from:

Select one:

a. 85 km to more than 200 km

b. 0 km to 11 km

c. 11 km to 50 km

d. 50 km to 85 km

c. 11 km to 50 km

30

The tropopause in mid latitudes is:

Select one:

a. Lower in summer with a lower temperature.

b. Lower in winter with a higher temperature.

c. Lower in summer with a higher temperature.

d. Lower in winter with a lower temperature.

b. Lower in winter with a higher temperature.

Surface temperature controls tropopause height. Cold air will cause the tropopause to lower. The lower the tropopause the warmer is becomes.