Questions for Exam Flashcards
Lag in daily temperature refers to the lag time between
the time of maximum solar radiation & the time of maximum temperature
During the afternoon the greatest temp diff. between the surface air & the air several meters above occurs on a
Clear, calm afternoon
The greatest variation in daily temp usually occurs
at the ground
In summer, humid regions typically have ……….. daily temp ranges & ………….. maximum temps than drier regions.
smaller, lower
In most areas the warmest time of the day about 5 feet above the ground occurs
in the afternoon between 2 & 5 pm
Everything else being equal, the lowest air temp on a winter night will occur above a
surface covered with snow
Which is generally true at night
Earth emits more energy than it absorbs
Lowest temp is usually observed
around sunrise
Which is generally true during the day
Earth absorbs more energy than it emits
In clear weather the air next to the ground is usually ………. than the air above during the night, & ………. than the air above during the day
colder, warmer
One would expect the lowest temps to be found next to the ground on a
Clear, dry, calm day
Warmer than average overnight temps are probably not associated with
a strong radiation inversion
At what time during a 24-hour day would a radiation temp inversion best be developed
near sunrise
Ideal conditions for a strong radiation inversion are
Clear, calm, dry, winter night
The primary cause of a radiation inversion is
infrared radiation emitted by the earth’s surface
Important reason for the large daily temp range over deserts is
there is little water vapor in the air to absorb & re-radiate infrared radiation
The deepest radiation inversion would be observed
in polar regions in winter
A radiation inversion is most commonly observed
just above the ground
On a clear, clam, night, the ground & air above, cool mainly by this process
radiation
Orchard heaters & wind machines are most useful in preventing damaging low temps from occurring next to the ground on
clear, calm nights
Thermal belts are
warmer hillsides that are less likely to experience freezing conditions
In a hilly region the best place to plant crops that are sensitive to low temp is
alone the hillside
Lines connecting points of equal temp are called
isotherms
Wind machines can prevent surface air temps from reaching extremely low readings by
mixing surface air with air directly above
Two objects A & B have the same mass but the specific heat of A is larger than B.
If both objects absorb equal amounts of energy, which will be warmer
B will becomes warmer than A
If energy is added to an object, the smallest temp change will occur when the object has
large mass, large specific heat
When you observe large changes in the temp of an object even though only small amounts of energy are added or removed, you might conclude the object has low
specific heat
Two objects have the same temp. Object A feels colder to the touch than object B. This is probably because the two objects have different
thermal conductivities
The largest annual range of temps are found
at polar latitudes over land
If you subtract the daily minimum from the daily maximum temp you have the
daily range of temp
This is used as an index for fuel consumption
heating degree-days
The wind-chill index relates
body heat loss with wind to an equivalent temp with no wind
In calm air the temp is 10* C if the wind speed should increase to 30 knots (no change in air temp) the thermometer would indicate
a temp of -10* C
Which is usually a liquid-in-glass thermometer
minimum thermometer
A thermometer with a small constriction just above the bulb is a
maximum thermometer
When would be the best time to reset a minimum thermometer
just after the maximum temp
A thermometer that measures temp & records it on a piece of a chart paper is called a
thermograph
This instrument obtains air temp by measuring emitted infrared energy
radiometer
Ideal shelter for housing a temp-measurement instrument should be
white
During the long arctic winter, radiation inversions are
frequent
At what depth within the soil would you expect to find the smallest annual variation in temp
10 cm
Sandy soil has relatively low thermal conductivity & will reach a higher temp during the day than other types of soil
T/F
True
Thermal conductivity tell you the amount of heat needed to warm 1 gram of a material 1* C
False
On a cold night, wind can prevent an inversion from forming
True
Which two atmospheric layers have temperature profiles that promote vertical motion?
mesosphere and stratosphere.
Coriolis effect is strongest at this latitude
90* (the poles)
The atmospheric greenhouse effect is produced mainly by the
absorption and emission of infrared radiation by the atmosphere
The stratospheric ozone hole occurs in Antarctica during souther/northern hemisphere spring?
Over Antarctica in the southern hemisphere spring (with the return of the sun)
The sun emits predominantly………..radiation whereas the Earth emits predominantly…………radiation
shortwave, longwave
Which of the following processes transports, on average, the most energy from the ground to the atmosphere?
a. convection
b. conduction
c. radiation
d. latent heat
c. radiation
The average speed of the molecules in a sample of air is directly related to the_______.
a. heat content
b. temperature
c. specific heat
d. wavelength of maximum intensity
e. pressure
b. temperature
The earth emits radiation with greatest intensity at______.
a. infrared radiation
b. radio wavelengths
c. visible wavelengths
d. ultraviolet wavelength
a. infrared radiation
During conduction, kinetic energy is transferred from:
a. cold to hot areas
b. areas of high to areas of low pressure
c. hot to cold areas
d. humid to less humid areas
e. regions of slow moving molecules to regions of fast moving molecules
c. hot to cold areas
Over the earth as a whole, one would expect to observe the smallest variation in temperature from day to day and from month to month:
a. in the centre of a large landmass
b. along the Pacific coast of North America
c. on a small island near the equator
d. at the North Pole
e. high in the mountains in the middle of a continent
c. on a small island near the equator
The property of electromagnetic radiation if inversely proportional to temperature; if temperature increases _____ will decrease.
a. propagation speed
b. intensity
c. rate of emission
d. wavelength of peak emission
d. wavelength of peak emission
The cold feeling that you experience after leaving a swimming pool on a hot, dry, summer day is:
a. heat transported by conduction
b. heat transported by convection
c. heat transported by radiation
d. heat transported by latent heat
d. heat by transport by latent heat
The temperature of the soil is strongly influenced by solar radiation. At what depth within the soil would you expect to find the smallest annual variation in temperature?
a. 2 cm
b. 1 cm
c. 10cm
d. 5 cm
c. 10 cm
One would expect the lowest temperatures to be found next to the ground on a
a. none of the above
b. clear, calm night
c. clear, windy night
d. cloudy, windy night
e. cloudy, calm night
b. clear, calm night