Met Flashcards
The sphere closer to the earths surface us
Troposphere
The tropopause is (higher/lower) and (warmer/colder) over the equator than at poles
Higher
Colder
A trough is an extension from a …
Low
A ridge is an extension from a …
High
Main elements of an ISA
Sea level pressure 1013.2 hPa
Air temp at sea level 15C
Temp lapse rate of 1.98C/1000ft
Temp above 36090ft constant -56.5C
What is pressure lapse rate
A given reduction of pressure with height
Pressure lapse rate is higher or lower in cool air
Higher, as cool air column particles are closer together and therefore column is shorter, so height increase will have greater impact on pressure
What is a col
A neutral area between two highs and two lows. Wind will be calm
What is pressure gradient
The change in pressure per horizontal distance
Increased temp does what to density
Decreases
Dew point defined
Temperature at which air becomes saturated
When temp drops below dew point what occurs
Condensation
When moisture is added to air, it’s density will
Decrease
As temp decreases, RH goes up until dew point reached, then condensation takes place
.
When air temp reduces, what happens to RH and DPt
RH goes up
DPt not affected
When air temp increases, what happens to RH and DPt
RH goes down
DPt not affected
When water vapour increases, what happens to RH and DPt
RH goes up
DPt goes up
When water vapour decreases, what happens to RH and DPt
RH goes down
DPt goes down
When ice turns to vapour
Sublimation
When vapour turns to ice
Deposition
Height of tropopause over equator
60,000ft
Height of tropopause over poles
30,000 ft
Temp constant with height called
Isothermal layer
Temp increase with height called
Inversion
