Vayudoot Aviation

1. The warm temperature climatic zone is

approximately 35° - 40° of latitude and is under the influence of polar front depressions throughout the year

approximately 35° - 40° of latitude and provides a warm dry summer with a cool wet winter

approximately 20° - 35° of latitude and covers the high pressure desert regions of the world.

approximately 35° - 40° of latitude and provides a wet summer season and a dry cold winter

2. The upper winds tend to be westerly outside the tropics because

the rotation of the earth is west to east

surface winds are nearly always westerly.

jet streams are usually westerly.

the thermal winds are westerly on average.

3. Monsoons are seasonal winds which

are never in combination with trade winds

are from the southeasterly direction over the Indian sub continent in summer

develop due to the high pressure over continents in winter and the subsequent low pressure which develops over the same areas in summer

blow only in the southeast Asia region

4. The most notorious advection fogs occur

over southwest UK

over Europe with high pressure to the north

over central North America in autumn and winter

over the sea in the region of Newfoundland and the Kamchatka peninsula

5. Dust storms and haze are most common

with the Haboobs in winter

in unstable air with low pressure

in temperate latitudes

in association with the sub tropical anticyclones over land

6. Trade winds in the southern hemisphere are

in opposition to the monsoons

usually from the northeast

southeasterly

southeast at first becoming southwest

7. Jet stream main locations are

in association with the polar front and with mountain waves.

in the warm air some 400 nm ahead of a warm front and some 200 nm behind a cold front and near the sub tropical highs.

in the warm air some 400 nm ahead of a warm or cold front and near the subtropical highs

only in association with the polar front.

8. The large change in the direction of trade winds is caused by

the change in geostrophic force when crossing the geographic equator.

an excess of air at height in association with the Hadley cells.

the cyclostrophic force in the equatorial regions.

local pressure differences.

9. Tropical Revolving Storms are

easily predictable.

a summer weather feature.

can travel at speeds of 100 kt.

can be very active well inland.

10. The Savannah climatic zone is

approximately 10° - 30° of latitude and has a period of long rains in spring and autumn, but is never dry.

approximately 10° - 20° of latitude and provides a wet winter season and a dry hot summer.

approximately 10°- 20° of latitude and provides dry trade wind conditions in winter and a wet summer season.

approximately 20° - 30° of latitude and provides very dry desert conditions throughout the year.

11. The Polar Front is

only apparent over the Atlantic ocean.

the region where warm sector depressions develop.

near the poles.

the boundary surface between polar continental and tropical continental air

12. Near the equator upper winds tend to be

calm.

westerly.

at speeds greater than 60 kt.

easterly

13. The Tropopause is

more or less constant for any latitude.

the upper limit for jet streams and mountain waves.

normally the upper limit of weather.

is a boundary layer between the troposphere and the stratosphere.

14. The average temperature around the equatorial regions

is always above +40° C

varies on average from winter to summer by only some 5° C

is higher over the sea areas

has a very high range of temperatures throughout the year

15. The Hadley cell is the name given to

the CU cells which continue to form a CB.

a cell formed by lifted air over the heat equator descending to the sub tropical highs

an initial bubble of air which is lifted by convection.

the centre portion of a jet stream.

16. Statistical pressure values tend to be

on average parallel to the lines of latitude in the southern hemisphere and much more variable in the northern hemisphere

on average parallel to the lines of latitude

much lower in winter in the northern hemisphere than in the southern hemisphere

higher over the oceans in winter

17. The outflow from the Siberian High

is northwesterly over Japan, northeasterly over southeast Asia and easterly over Europe.

is evident throughout the year.

is northwesterly over Japan, northerly and northeasterly over China and northerly over the whole of India

is the source of Polar Maritime air.

18. Northern hemisphere summers tend to be

colder than the southern hemisphere because of the large land masses.

warmer than the southern hemisphere and winters are warmer too.

warmer than the southern hemisphere and the winters are colder

colder than the southern hemisphere due to the smaller amount of solar radiation.

19. The heat equator is

another name for the geographic equator

a line over the land joining places where the winter temperatures are highest.

a line over the land joining places where the summer temperatures are highest.

coincident with the equatorial trough and ITCZ

20. The areas of greatest rainfall are

in the equatorial regions.

those where there is much polar front depression activity.

in central North America in summer due to the large convective cloud formations.

in the polar regions.

21. Trade winds

blow towards the sub tropical anticyclones

are caused by lifting over the heat equator and the subsequent air movements from the sub tropical anticyclones

blow from the equatorial low pressure systems throughout the year.

only blow in the winter months.

22. The most numerous and frequent thunderstorms occur

in regions affected by cold fronts.

over the east Indies area (Java) due to the intense surface heating.

in association with tropical revolving storms

in association with the ITCZ over north Africa

23. Jet streams

are located above the tropopause.

only occur in the troposphere.

have a speed in excess of 80 kt.

are caused by a large difference in mean temperature in the horizontal.

24. The effect of mountain barriers on temperature is exemplified by the following

the Himalayas prevent warm dry air from Russia reaching India and Pakistan

the Ural mountains of West Russia prevent most of the cold Siberian air reaching Europe in summer

European temperatures are low in winter because there is no barrier to prevent cold Atlantic air crossing the area.

the Rocky mountains of North America prevent cold Pacific air reaching inland, so summer temperatures to the east of the mountains are high

25. The ITCZ is

the region between the two trade wind systems centred on the heat equator

the boundary between polar air and equatorial air.

the boundary region between the two monsoons.

a region of calm winds and layer type clouds with much haze.

Question Bank

Questions for GLOBAL CLIMATOLOGY