Flashcards in Cloud Formation and Precipitation Deck (39)
what is the adiabatic principle?
as a gas expands it cools down, as it is compressed it warms up
as a gas ________ it cools down
what happens when a gas expands?
it cools down.
as a gas ________ it warms up
when a gas compresses it...
the temperature change of gas is based solely on __________
increase or drecrease of pressure
in the atmosphere as you increase in _________ the ________ decrease
what happens when you increase in altitude?
why doe pressure drop when you increase in altitude?
you have less atmosphere above you
as air rises it....
expands and cools down
as air sinks it..
is compressed and warms
what is the dry adiabatic rate?
as dry air raises it cools at a particular rate, 10 celsius per 1000m
what is the wet adiabatic rate?
if you have a wetter parcel of air and it rises it cools down at a slower rate. 5 celsius per 1000m
why does wet air cool slower?
because all of the moisture in that air is condensing as it cools down and the process of condensation release heat
the wet adiabatic rate increases....
an increase of condensation in the atmosphere causes what to form?
_____ air has to rise higher then ______ air in order for clouds to form
clouds form when water vapor ______ in rising air parcels
the presence of particles (like dust) suspended int he air
what are the presence of parties suspended in the air called?
what do condensation nuclei allow the air to do?
glom on to nuclei and form coherent rain or water droplets.
what are the four families clouds are grouped into?
high, middle, low, and clouds with vertical development
what are the two classes of clouds?
what are the two classes of clouds based on...
stratiform are ______ clouds
cumuliform are _________ clouds
moisture-laden clouds release moisture as...
in order to form precipitation there must be something that..
causes air to rise int he atmosphere so that it cools down enough to reach its dew point
what are the four ways that air moves upward to form precipitation
1. orographic precipitation
2. convectional precipitation
3. cyclonic precipitation