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ATPL Meteorology > MET 1 - The Atmosphere > Flashcards

MET 1 - The Atmosphere Flashcards

1
Q

Density is directly proportional to, and inversely proportional to?

A

Directly Proportional to Pressure Inversely proportional to temperature

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2
Q

The mean density of the atmosphere is?

A

1225 gm/m^3

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3
Q

What is the average density of water vapour at sea level?

A

760gm/m^3

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4
Q

What is the calculation to approximate feet per hpa?

A

feet per hpa = 96T(K)/P(hpa)

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5
Q

The tropopause is the limit of?

A

Vertical movement of air and significant weather

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6
Q

What is the heights in M and FT and temperature of the tropopause in the Poles?

A

8km, 26 000ft and -45ºC

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7
Q

What is the heights in M and FT and temperature of the tropopause in the Mid Latitudes?

A

11km, 36 090ft and -56ºC

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8
Q

What is the heights in M and FT and temperature of the tropopause at the Equator?

A

16km, 52 500ft and -75ºC

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9
Q

The breaks between the tropopause show the location of what?

A

Polar and sub-tropical fronts

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10
Q

Airflow over hills will cause____.

A

A drop in atmospheric pressure

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11
Q

How is QNH calculated and what will it read while on the ground?

A
  • QNH is QFE reduced to Sea Level using Standard Atmosphere
  • On the ground it will read elevation
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12
Q

What does QFF measure, what is the QFF used on?

A
  • QFF measurs the station pressure adjusted to MSL using actual met conditions.
  • This information is used on hi level met charts
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13
Q

What is QNE and when is it used?

A
  • QNE is touch down point of an aerodrome when 1013.2 is set on the altimeter.
  • This is used at airfields that may be to high and the reading would be too low if QNE was used
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14
Q

What would the answer of 1013.2hpa - 998hpa be multiplied with to show difference in:

  1. m?
  2. ft?
A
  1. 8m
  2. 27ft
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15
Q

When will QNH & QFF be the same?

A

They will be the same in ISA conditions.

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16
Q

If the OAT is colder than ISA QFF will be more or less than QNH?

A

QFF will be less than QNH

17
Q

Excet for ISA conditions when is QNH correct?

A

When the aircraft is on the ground

18
Q

An area of low pressure rotates **clockwise/anti-clockwise **in the southern hemisphere.

A

Clockwise in the Southern Hemisphere

19
Q

An area of High Pressure rotates anticlockwise/clockwise in the southern hemisphere.

A

Anti Clockwise in the southern hemisphere

20
Q

An aircraft travelling from high pressure to low pressure would experience what barometric error?

A

The Aircrafts True Altitude would decrease

21
Q

If you have a constant indicated altitude, have right hand drift (stbd drift) the true height would be?

A

The True height would decrease as you would be moving from high pressure to low pressure.

22
Q

The Gas Composition of the atmosphere is?

A
  • N2 = 78%
  • O2 = 21%
  • CO2, O3 and Other gasses = 1%
23
Q

The process of heating the atmosphere is…

A

Suns short wave radiation gets absorbed by the earth and re-emmitted as long wave radiation that heats the lower levels of the atmosphere

24
Q

If there is Constant Temperature, when Density increases pressure will?

A

Decrease

25
Q

As the temperature of a parcel of air increases it becomes_______

A

Less Dense

26
Q

Moist air is less/more dense than dry air?

A

Less Dense

27
Q

The Mb altitudes in feet are?

  • 1013.2mb - ?
  • 700mb - ?
  • 500mb - ?
  • 300mb - ?
  • 200mb - ?
  • 100mb - ?
A
  • 1013.2mb - Sea Level
  • 700mb - 10 000ft
  • 500mb - 18 000ft
  • 300mb - 30 000ft
  • 200mb - 38 000ft
  • 100mb - 53 000ft
28
Q

The temperature and ceiling in **feet ** of the tropopause over:

  1. The Poles
  2. Mid Latitudes (45º N/S)
  3. Equator
A
  • The Poles 26 000ft, -45ºc
  • Mid Lat 36 000ft, -56ºc
  • Equator 52 500ft, -75ºc
29
Q

The temperature and ceiling in Meters of the tropopause over:

  • The Poles
  • Mid Latitudes (45º N/S)
  • Equator
A
  • Poles - 8km, -45º
  • Mid Lat - 11km, -56ºc
  • Equator - 16km, -75ºc

ATPL Meteorology (6 decks)

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