Meteo 2
T2b
T2b
Set of flashcards Details
| Flashcards | 448 |
|---|---|
| Language | Deutsch |
| Category | Biology |
| Level | Primary School |
| Created / Updated | 12.01.2015 / 04.08.2016 |
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radiation fog
Einstrahlung fehlt = absence id dorrest solar radiation (night time)
Haze
consists of solid participles look smoke dust etc. => rel. humidity below 80%
Surface wind
Wind at 10 meters above ground level
On weather charts, which north is ment ?
teh geographic north ==> only the tower magnetic north => rwy related to magnetic north
gusts are reported when
gust speed over 10 its
Wind is measured at which high?
10 m above ground
15 m/s in knots
30 knots
Wie wirk die pressure gradient force
senkrecht zu dem isobars richtichtung Tief
centrifugal force
is proportional to the square of the speed => point outward
Fricton force direction?
Opposite to the wind direction => increases with surface roughness
Which wind force does not depend on teh wind speed?
the pressure gradient force causes the wind but does not depend on the wind speed ==> only force capable of putting an atmosphere at rest into motion
Where is the Coriolis force zero?
Äquator
Eulerian wind
the pressure gradient force accelerates the air into the direction of G from high pressure to low pressure
Wann wird die Corioliskraft wichtig?
above 100 km
Geostrophic wind?
Pressure gradient Force beginnt mit der Bewegung der Luft. Sobald sie sich bewegt, kommt die Corioliskraft ==> gleichen sich aus und resultierende Kraft = geostrophic wind
the closer the isobaren, desto
stronger der Wind
Friction wind: over water
speed: 70 % Abweichung 10 Grad
Friction wind: over land
speed: 50% Abweichung 30 Grad nach links vom geostrophic wind
In unstable air, what happens with the fricton wind?
wird in höhere Höhen getragen
wann ist die Luft am instabilsten?
Kurz nach dem Mittag => ground temp. is at the maximum
Wann wird der geostrophic wind stärker?
kleiner Abstand isobaren und increases with decreasing geographic latitude
Why brings the sea brize fog like in SFO
Sea prize brings cold air, which may cool the overlying air and fog develops
supercooles water droplets
supercooles water droplets are liquid water droplets at temperatures below freezing point
condensation nucleid
are required to collect the widely spaced water vapor molecules
Latent heat
Heat which is released or supplied during phase changes
Water water pressure
definied as the partial pressure of water vapor in the gas mixture of moist air => It is a measurement of the humidity of air
Saturation
the equilibrium between the condensation rate and the evaporation rate => The related water vapor pressure in the air is called saturation water vapor pressure
The saturation vapour pressure above ice surfaces is smaller than
the saturation vapor pressure above water surfaces
Wann rel. Luftfeuchtigkeit max.?
Wann rel. Luftfeuchtigkeit minimal?
min.: afternoon (Temp. max )
max: after sunrise (temp. low)
Ab welchen spread Acjtung Fog?
2 K or lower
Mixing ratio => wann konstant, wo nichT?
ratio of the mass of water vapor to the mass of dry air ==> g/kg => dry adiabatic: mixing ratio constant sutured adiabatic: Decreases condensation removes water vapor from the volume and the mixing ratio decrease
What do you measure with the psychrometer?
measurement of the humidity => 1 wet bulb thermometer 1x dry bulb thermometer => dry air through the through the 2 tubes => By the wet bulb evapoeration ==> more dry air => more evaporation => higher difference = difference is measure of the humidity
Hygrometer
measuring the humidity directly => rel. humidity
adiabatic? Dray adiabatic lapse rate?
no heat exchange or loss => Dry adiabatic lapse rate = temp. decreasing within a rising unsaturated air parcel => 3K/1000 ft
isothermal layer
temp constant with height
When it is called absolutely stabel?
absolutely stable if it is dry stable and moist stable
Which of the following is the definition of relative humidity ?
Ratio between the actual mixing ratio (Absolute Humuidity) and the saturation mixing ratio (Saturated Vapour Capacity) X 100
exceed
überschreiten
An inversion implies...
great stability
What happens to stability of the atmosphere in an isothermal layer (temp constant with height)?
Absolutely stable
