Chapter 6 NAS
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 12 °C and the vapor pressure is the same 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
If 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 stable for clear air and unstable for cloudy air.
7
A lapse rate of ______ Celsius degrees per 1000 meters is conditionally stable.
8
A lapse rate of ______ Celsius degrees per 1000 meters is stable for unsaturated air parcels.
8 7 2 All of these are correct.
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.
Air mass advection ______ change the relative humidity.
CAN
______ on a Stüve diagram are isobars.
Horizontal lines
In winter, the precipitable water value is likely to be highest in ________.
Miami, FL
______, annual precipitation is greater than annual evapotranspiration.
On the continents
______, annual precipitation is less than annual evaporation.
On the ocean
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.
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.
If a saturated (cloudy) air parcel is heated (say 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.
destablize
As the temperature of a saturated (cloudy) air parcel falls, its relative humidity ______.
does not change
In an isothermal temperature profile, the air temperature
does not change with altitude.
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 is absorbed from the environment when
ice changes directly to vapor.
An example of sublimation is
ice disappearing while temperatures remain below freezing.
A temperature inversion is characterized by a(n) ______ of air temperature with altitude.
increase
Rising air temperature causes the saturation mixing ratio to ______
increase
The saturation vapor pressure ______ with rising air temperature.
increases
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.
As a clear parcel of air ascends dry adiabatically,
its relative humidity increases. its saturation vapor pressure decreases. its temperature drops. All of the above are correct.
A rain shadow is situated downwind from the ______ slopes of a high mountain barrier.
leeward
In an agricultural field, direct evaporation of water from the soil is usually ______ transpiration of water by plants.
less than
Clouds are ______ to develop if a radiosonde sounding indicates unstable air.
more likely
Cumulus clouds are ______ likely to build into thunderstorm clouds when the air temperature profile (sounding) indicates unstable conditions.
most
The maximum pressure that water vapor molecules could exert if the air were saturated is called the
saturation vapor pressure.
A snow cover tends to ______ the overlying air.
stabilize
Normally, the stratosphere is ______.
stable
______ air tends to suppress convection.
stable
Evaporation is to condensation as deposition is to ______.
sublimation
Stable air ______ vertical motion of air parcels.
suppresses
As unsaturated (clear) air flows down the leeward slopes of a mountain range,
the air temperature rises. the relative humidity decreases. the saturation vapor pressure increases. All of the above are correct.
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.
Conditional stability indicates that an air layer is
unstable for saturated and stable for unsaturated 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 side of mountain ranges are relatively ______ compared to the leeward side.
wet
