Air Masses and Fronts. Chapter 4, Pages 4-1 through 4-31.
What two factors are necessary to produce an
homogeneous properties of temperature,
lapse rate and moisture
Large divergent flow and a widespread
body of relatively uniform air
Uniform surface and relative humidity
Moisture and heat
Why are anticyclonic circulations most favor-
able for air mass development?
The horizontal outflow of air affects a
much larger area
The air moves slowly or is stagnant,
making it easier for the air to assume the
characteristics of the underlying surface
The subsidence associated with these
circulations is favorable for lateral mixing,
All of the above are reasons
The properties an air mass acquires in its
source region are dependent on a number of
factors. Which of the following is NOT a factor
in determining air mass properties?
Time of year
Type of surface (land, water, ice)
Length of time the air mass remains over
Which air mass has its source region between
10°N lat. and 10°S lat.?
Monsoon air is REALLY one of two air masses
depending on the time of year. Which two air
masses make up monsoon air?
cP and mT
cP and E
mP and E
mP and mT
On what factors are air mass classifications
Temperature, humidity, and wind
Season, latitude, and source region
Geographic origin, moisture content, and
A cP air mass moves south out of its source
region in Canada and invades the south central
U.S. How would this air mass most likely be
How is the stability of an air mass affected, if at
all, when it leaves source region?
It is increased only
It is decreased only
It may be increased or decreased
It is not affected
It is February, and a very cold continental polar
air mass pushes south over tropical waters.
Which, if any, of the following changes is most
likely to occur within the air mass?
A decrease in water vapor content takes
The lower layers are cooled by conduction
An increase in stability occurs
None of the above