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Meteorology > Atmosphere And Pressure > Flashcards

Atmosphere And Pressure Flashcards

1
Q

Definition meteorology

A

Study of the behaviour and composition of the atmosphere

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2
Q

Atmospheric distribution

A

1/2 below 5000’
3/4 below 11000’

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3
Q

Average lapse rate through tropopause

A

2° per 1000’

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4
Q

4 most important elements to weather

A

Water vapour
Carbon dioxide
Aerosols
Ozone
The ocean has the strongest effect on weather

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5
Q

Troposphere height

A

9-17 km
36090 ft

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6
Q

Isotherm definition

A

Atmospheric layers with constant temp

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7
Q

Water vapour state change

A

Releasing or using latent heat

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8
Q

Effect of CO2

A

Compound gas
Heats atmosphere by absorbing terrestrial radiation
Presents very small amount in atmosphere but rapid increase causing global warming

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9
Q

Ozone function

A

Absorb UV light from sun
Heat troposphere

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10
Q

Hectopascal units

A

Hecto (100)
Pascal 1 newton/m2

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11
Q

Pressure lapse rate

A

1hpa for every 30’

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12
Q

Isobar definition

A

Same barometric pressures
Wind flows parallel
Closer isobars are stronger wind

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13
Q

Anticyclones

A

High pressure enclosed by isobars
Highest pressure in the centre decreasing outwards
Wind flows anti clockwise in southern hemisphere
Air descends in high pressure can cause some cloud

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14
Q

Cyclones

A

Low pressure in the centre increasing moving outward
Closely spaced isobars high winds
Wind travels clockwise in southern hemisphere
Air rises causing instability
Known as depressions

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15
Q

Ridges

A

Extension of high pressure isobars
Weather similar to anticyclone
Ridges are never marked

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16
Q

Troughs

A

Extension of low pressure isobars
Weather similar to cyclones
Pressure lower than either Side of trough

17
Q

Col

A

Area between square of opposing high and low
Very weak wind
Unpredictable weather

18
Q

ISA atmosphere

A

1013.25 hpa
15°
1.98°per 1000’
Fg 9.8
Air density 1.225 kg/m3

19
Q

QNH vs QFE

A

QNH is amsl
QFE is height agl (Aerodrome)

20
Q

QNH above transition layer

A

13000’ 150fl
1013

Meteorology (16 decks)

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