This
applet
tests
the
sensitivity
of
a
barotropic
model
to
time
step,
grid
spacing,
and
initial
conditions.
The
site
explains
the
CFL
(CourantFriedrichsLewy)
criterion
(that
the
speed
of
fastest
winds
in
the
model
must
be
less
than
or
equal
to
grid
spacing
divided
by
the
time
step)
and
how
a
finitedifference
weather
prediction
model
blows
up
if
this
criterion
is
not
met.
The
user
of
this
applet
...



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This
applet
simulates
a
world
where
there
are
two
kinds
of
plants:
white
daisies
and
black
daisies.
These
plants,
along
with
bare
ground,
cover
the
planet.
There
is
a
fixed
death
rate,
as
well
as
a
fixed
value
for
horizontal
temperature
transport.
The
plants,
however,
have
different
albedos.
The
user
sets
the
luminosity
and
when
a
steady
state
is
reached,
the
percentage
of
cover
by
the
daisies
and
...



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This applet determines the height of the base of any cumulus cloud that might form due to convection, when the temperature and dew point sliders are adjusted. The applet displays clouds between 1000 and 10,000 feet.



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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This applet tests the balance of the frictional, pressure gradient, and Coriolis forces with the wind. The applet displays vectors for these forces and the wind as the latitude, friction (drag), and pressure gradient are adjusted.



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This applet allows users to test their understanding of the basic geostrophic wind equation. Instructions are given on how to adjust the friction force (drag), pressure gradient force, and latitude in order to test the equation. There are also other instructions and questions to learn about the balance of Coriolis, frictional, and pressure gradient forces and the wind.



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This applet enables students to learn about the balance of Coriolis forces and the wind. Students will explore the direction and magnitude of the Coriolis force as a function of latitude and wind speed. The horizontal and vertical components of the Coriolis force as well as the total Coriolis force are graphically displayed as changes are made to the wind speed and direction or latitude.



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This applet explores the interaction of two waves, allowing users to control both the period and amplitude as well as the phase between the two waves. Students can try to get the sum to be zero when the two component waves have a nonzero amplitude.



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This applet explores the weighting function, which provides information on what regions of the atmosphere affect satellite measurements. The exercise investigates how changes in the line shape, gas concentration, and vertical distribution of the gas impact the weighting function. The temperature dependence is neglected.



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This applet uses graphs to demonstrate the effective temperature of planets. The graphs display temperature versus distance from the sun. The albedo, solar constant, and distance can be adjusted. There are marks at each of the locations of the solar system planets. The axes can be in linear or logarithmic form; the temperature can be displayed in Kelvin, Fahrenheit, or Celsius.



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This
applet
enables
students
to
explore
the
effect
emissivity,
albedo
and
solar
output
have
on
temperature
throughout
the
atmosphere.
It
graphs
altitude
versus
temperature.
There
are
controls
for
adjusting
atmospheric
emissivity,
planetary
albedo,
and
the
solar
constant.
Each
axis
can
be
displayed
in
logarithmic
or
linear
form;
the
temperature
can
be
displayed
in
Kelvin,
Fahrenheit,
or
Celsius.
The
...



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