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1. What is the characteristics of a Continental Arctic air mass? - ANSWER
- Dry
- Very Cold
- Very Stable
- Very Low Tropopause
2. What is the characteristics of a Continental Polar air mass? - ANSWER -
- Dry
- Cold
- Fairly Stable
- Low Tropopause
3. What is the characteristics of a Maritime Arctic air mass? - ANSWER
- Moist
- Cold
- Unstable in Lower Levels
- Low Tropopause
,4. What is the characteristics of a Maritime Polar air mass? - ANSWER - Moist
- Cool
- Unstable
- Medium Tropopause
4. What is the characteristics of a Maritime Tropical air mass? - ANSWER -
- Moist
- Hot
- Very Unstable
- High Tropopause
- What is the characteristics of a Continental Tropical air mass? - ANSWER
Dry
- Very Hot
- Very Unstable
- Very High Tropopause
7. Continental Tropical is ________ in North America, so it is: - ANSWER 1)
Very Small
2) Only occasionally found in Canada
8. Continental Polar air is: - ANSWER Not found in Canada.
9. How does the temperature of the air mass effect the height and the
temperature of the Tropopause? - ANSWER The warmer the air mass, the
higher and colder the Tropopause.
,The colder the air mass, the lower and warmer the Tropopause.
10. The temperature difference between air masses is ______ at low levels in the
Troposphere and ____ at the high levels. - ANSWER 1) Greatest
2) Least
11. The Modification of Air Masses is dependent on what three things? - ANSWER
1) The speed with which the air mass moves
2) The moisture or dryness of the region over which the air mass travels
3) The temperature difference between the new surface and the air mass.
12. How does Warming From Below modify an Air Mass? - ANSWER Warming
from below develops instability and convection in the lower levels of the
atmosphere.
- The earth's surface characteristics of dryness, moisture and temperature are
carried aloft and modify the air mass to a considerable height.
13. How does Cooling From Below modify an air mass? - ANSWER It causes an
increase in stability within the lower levels.
This blocks vertical motion so that any modifications of moisture and temperature
occurring in an air mass that is moving over colder terrain will be restricted to the
lower few thousand feet.
, 14. What is the Source for Continental Arctic air? - ANSWER The Arctic area
that is covered with snow and ice in Northern Canada.
15. How is the Continental Arctic air modified in the Winter when it passes over
the North Pacific? - ANSWER It is intensely heated from below so that vigorous
convection develops and moisture from the ocean surface evaporates rapidly into
the air.
- There is convective turmoil in the lower levels and is very turbulent.
- Has frequent showers or snow showers.
16. What was Continental Arctic air rapidly changes to Maritime Arctic air.
How is the Continental Arctic air modified when it passes even further South over
the North Pacific? - ANSWER The water surface is even warmer, the air finally
reaches the temperature of the surface and the convective activity becomes
subdued.
The temperature and moisture modification will have been carried throughout the
air mass up to the Tropopause.
17. What was the Continental Arctic air is now Maritime Polar.
How is the Continental Arctic air modified when it passes through the center of
the continent in the Winter? - ANSWER There is very little modification as long
as it stays over a snow surface.
South of the snow line, it will be heated from below. It will become Continental
Polar air.