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27 Cards in this Set
- Front
- Back
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With no change in the altimeter subscale setting or the altitude indication, what is the effect on true altitude of flying from warm air into cold air?
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The altimeter will over read
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List 4 processes that transfer heat from the earth's surface into the atmosphere.
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Conduction
Convection Condensation Radiation |
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Why are summers warmer than winters?
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Suns elevation is higher in summer and above the horizon for longer.
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List two of the four factors that alter the typical diurnal variation of surface temperature,
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Surface type, season, lattitude, cloud cover
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Define environmental lapse rate (ELR)
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The observed change of temperature with height
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What is QFF?
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QFF is QFE reduced to MSL using ambient temperature.
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What is QFE?
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Pressure at the airfield datum
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What is QNH?
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QNH is QFE reduced to MSL using ISA lapse rate
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Which is likely to be more accurate, an aerodrome QNH or a regional QNH?
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Aerodrome QNH
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With regard to pressure systems, what is the difference between a ridge and trough?
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A trough is an elongated low and a ridge is an elongated high.
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Describe a COL
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A COL is an area without isobars located between two diaometrically opposed highs and lows
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What is the main difference between incoming insolation and outgoing radiation from the earth?
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Insolation is short wave and radiation is long wave.
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What is the simplified formula that expresses the relationship between pressure, density and temperature in the atmosphere?
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Pressure
Density = ------------- Temp c |
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What cause the most significant reduction in the amount of insolation reaching the earths surface (assuming midday at any position on the earth at any time of year)?
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Cloud cover
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Name two greenhouse gases
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H20 and CO2
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Name the first two layers of the atmosphere.
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Troposphere and Stratosphere
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What is the diving line between the troposphere and stratosphere?
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The tropopause
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Describe the main change in the atmosphere which happens at the tropopause.
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Temperature ceases to decrease with height
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With regard to the actual atmosphere of the earth where is the topopause highest and lowest?
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Highest at the equator and lowest at the poles
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When the tropopause is higher, is the temperature at that point higher, lower or the same regardless of height?
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Lower
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List the standard factors of the ISA applicable up to 32km amsl
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+15c
1013.25hpa 1225g m3 ELR 1.98c per 1000ft Tropopause 36,090ft Tropopause temp -56.5c Above tpause temp increase 0.3c per 1000ft up to 32km |
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If the temperature at 36,000ft is -65c calcualte the ISA deviation.
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8.5c
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Convert +15c to absolute
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288 A
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Define latent heat
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Latent heat is the heat energy absorbed or released as a substance changes state.
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State whether latent heat is absorbed or released when water changes from ice to water.
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Absorbed
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State whether latent heat is absorbed or released when water changes from water vapour to water
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Released
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What is an isallobar?
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A line linking two points where the pressure trend is the same
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