ATM Chapter 6
If the mixing ratio of a parcel of air is 6 grams per kilogram and the relative humidity is 25 percent, the saturation mixing ratio is ______ grams per kilogram.
1.5 12 8 2 None of these is correct.
If the air temperature is 20 °C and the vapor pressure has the same value as the saturation vapor pressure, the relative humidity is
100%
A lapse rate of ______ Celsius degrees per 1000 meters is unstable for unsaturated (clear) air parcels.
11
f the mixing ratio of a parcel of air is 2 grams per kilogram and its saturation mixing ratio is 6 grams per kilogram, the relative humidity is ______ percent.
33.3
A lapse rate of ______ Celsius degrees per 1000 meters is conditionally stable.
8
Two equal volumes of air have the same temperature and pressure. One contains more water vapor than the other.
Both volumes of air contain the same number of gaseous molecules.
______ on a Stüve diagram are isobars.
Horizontal lines
As an unsaturated (clear) parcel of air ascends dry adiabatically,
It's relative humidity increases its saturation vapor pressure decreases and its temp drops all of the above
In winter, the precipitable water is likely to have its highest value in
Miami, FL
______ air tends to suppress convection and cloud development.
Stable
All of the following soundings (temperature profiles) always indicate stable atmospheric conditions with the exception of
a drop of temperature with altitude.
As an aircraft ascends within the troposphere, the external
air pressure increases. vapor pressure increases. saturation mixing ratio increases. air density increases. None of the above is correct.
A lapse rate of ______ Celsius degrees per 1000 meters is stable for unsaturated air parcels.
all
As unsaturated (clear) air flows down the leeward slopes of a mountain range,
all of the above
Global-scale water vapor imagery shows evidence that water vapor is transported
all of the above
Air mass advection ______ change the relative humidity.
can
Sublimation is to deposition as evaporation is to
condensation
Two equal volumes of air at the same temperature and pressure have different amounts of water vapor in them. The air parcel with the higher relative humidity will
contain the same number of molecules as the other parcel.
As measured by a sling psychrometer, the wet-bulb depression ______ with rising relative humidity.
decreases
If a saturated air parcel containing no cloud particles is heated (by absorption of radiation), its relative humidity
decreases
If the temperature of an unsaturated (clear) air parcel does not change while its mixing ratio increases, the density of the parcel
decreases
A relatively warm surface tends to ______ the overlying air.
destabilize
As the temperature of a saturated (cloudy) air parcel falls, its relative humidity
does not change
Unstable air ______ vertical motion of air parcels.
enhances
Rising parcels of saturated (cloudy) air do not cool as rapidly as rising parcels of unsaturated (clear) air because
expansional cooling of saturated air is partially compensated for by release of latent heat.
On a clear and calm day, the relative humidity usually ______ between sunrise and early afternoon.
falls
Suppose that the vapor pressure of the cold outside air is the same as the vapor pressure of the warm air indoors. If the door is opened and the cold air replaces some of the warm air, then the new relative humidity indoors would be
higher than before.
The greatest amount of latent heat (per gram) is absorbed from the environment when
ice changes directly to vapor.
An example of sublimation is
ice disappearing from a sidewalk while air temperatures remain below freezing.
A temperature inversion is characterized by a(n) ______ of air temperature with altitude.
increase
Rising air temperature is associated with a(n) ______ in the saturation mixing ratio.
increase
In an air layer characterized by a temperature inversion, the temperature
increases with altitude.
As an unsaturated parcel of air ascends dry adiabatically,
its relative humidity decreases. its saturation vapor pressure increases. its temperature rises. None of the above is correct.
A rain shadow is situated downwind from the ______ slopes of a high mountain barrier.
leeward
In an agricultural field during the growing season, direct evaporation of water from the soil is usually ______ transpiration of water by plants.
less than
Cumulus clouds are ______ likely to build into thunderstorm clouds when the air temperature profile (sounding) indicates unstable atmospheric conditions.
most
In the global water budget, annual precipitation is less than annual evaporation
on the continents
In the global water budget, annual precipitation is greater than annual evapotranspiration
on the ocean.
The maximum pressure that water vapor molecules would exert if the air were saturated is known as the
saturation vapor pressure.
A snow cover tends to ______ the overlying air, thus inhibiting convection.
stabilize
Normally, the stratosphere is
stable
Evaporation is to condensation as deposition is to
sublimation
As saturated (cloudy) air flows up the windward slopes of a mountain range,
the saturation mixing ratio decreases.
Conditional stability indicates that an air layer is
unstable for cloudy and stable for clear air parcels.
If the air temperature drops with altitude such that the actual lapse rate (sounding) is 7 Fahrenheit degrees per 1000 feet, the air layer is ______ for saturated (cloudy) air parcels and ______ for unsaturated (clear) air parcels.
unstable...............unstable
Cumulus clouds are more likely to form over
vegetated land surface in summer.
The windward slopes of mountain ranges are relatively ______ compared to the leeward slopes.
wet
