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Meteorology > The Atmosphere > Flashcards

The Atmosphere Flashcards

1
Q

Im kilometres and feet, what altitude does the troposphere go up to?

A

11km or 36,000ft.

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2
Q

What sphere is the ozone layer located in?

A

Stratosphere.

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3
Q

In the troposphere temperature decreases with height. How many feet do you need to travel for your temperature to decrease by 2 degrees?

A

1000ft.

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4
Q

What percentage of total mass air does the troposphere contain?

A

75%.

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5
Q

What percentage of the total water vapour does the troposphere contain?

A

99%

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6
Q

As a percentage, how much nitrogen is in dry air?

A

78%.

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7
Q

As a percentage, how much oxygen is in dry air?

A

21%.

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8
Q

At lower levels, what percentage of the atmospheres volume is water vapour?

A

4%.

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9
Q

Half of water vapours mass is located below what altitude in metres?

A

1.5km

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10
Q

At 36,000ft, what is the air temperature?

A

-56.5 degrees.

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11
Q

The tropopause changes its height dependant on temperature. In the Northern hemisphere, what are the three heights in the winter?

A

16km - 10km - 8 km

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12
Q

The tropopause changes its height dependant on temperature. In the Northern hemisphere, what are the three heights in the summer?

A

18km - 13km - 10km.

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13
Q

What do dotted lines on a significant weather chart indicate?

A

Clear air turbulence.

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14
Q

What do clear lines on a significant weather chart indicate?

A

Jet stream.

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15
Q

What would CB EMBD stand for on a significant weather chart?

A

Cumulonimbus clouds are embedded.

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16
Q

In the stratosphere, the temperature is constant up to what altitude?

A

20km / 65000ft.

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17
Q

What altitudes, in km, is the ozone layer present?

A

20-30km.

18
Q

Why is cloud formation rare in the stratosphere?

A

Lack of water vapour.

19
Q

What causes the temperature increase is the stratosphere?

A

The ozone layer.

20
Q

What effect can ozone gas have on an a human?

A

Respiratory problems.

21
Q

What is the ISA temperature at MSL?

A

+15’c

22
Q

How many degrees is decreased as you increase 100m in the troposphere?

A

0.65.

23
Q

In the states they use inches per mercury. What is the InHG at MSL?

A

29.92.

24
Q

What is the density at MSL?

A

1.225kg/m^3.

25
Q

What is the pressure at 5000ft?

A

843 Hpa.

26
Q

At the surface, how high would you have to go to reduce the pressure by 1hPa?

A

30ft/9m.

27
Q

At 18,000ft the pressure change decreases. How many feet do you have to climb to decrease the pressure by 1hPa?

A

48ft.

28
Q

At FL300, what is the pressure?

A

300hPa.

29
Q

At FL180, what is the pressure?

A

500hPa.

30
Q

At ground level, the density is 1.225. As a percentage, what is the density at 22,000ft?

A

50%

31
Q

At ground level, the density is 1.225. As a percentage, what is the density at 40,000ft?

A

25%

32
Q

What happens to the temperature from tropopause to FL650?

A

It varies but remains fairly constant.

33
Q

What happens to the temperature from tropopause to FL650?

A

It varies but remains fairly constant.

34
Q

In the ICAO Standard Atmosphere the decrease in temperature with height below 11 km is blank per 100m

A

0.65

35
Q

If the CB is ISOL then what is the expected percentage?

A

Less than 50%

36
Q

If the CB is OCNL then what is the expected percentage?

A

50-75%

37
Q

If the CB is FRQ then what is the expected percentage?

A

More than 75%

38
Q

Half the mass of the atmosphere is found in the lowest..

A

5km

39
Q

In mid-latitudes, what happens to the air temperature as altitude increases between the tropopause and FL 650?

A

Pretty constant

40
Q

Which process is mainly responsible for the warming of layers of air in the medium levels of the troposphere?

A

Convection

Meteorology (23 decks)

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