Monsoons
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MONSOONS
SOUTH AND EAST ASIA
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MONSOONS: Seasonal winds of southeast Asia.
•Blow from the southwest in the summer to create a rainy season.
•Blow from the northeast in the winter to create a cool, dry season.
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3 Distinct Seasons
• WINTER: cool and dry (40-60*F.) October - February.
• SPRING: hot and dry (70-110* F.) March - June. (school vacation)
• SUMMER: warm and rainy (70-90*F) July - September.
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1. During the spring and summer, the sun heats the
land from direct sun’s rays.
2. Air above the land is warmed, causing it to rise.
4. A current of moist air begins to flow in from the ocean.
5. As the moist air rises, it cools, causing heavy rains south of the mountains.
3. This action creates a low pressure area which draws in air masses from
cooler areas.
Land Ocean
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Summer Monsoon Advantages Disadvantages
• Brings rain for the crops (rice).
• Brings needed water supply.
• Relief from the heat.• Vegetation comes to
life.
• Flooding• Insects and reptiles.• Destruction of
property.• If rains come too late -
drought.
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1.During the winter, the cold interior is not influenced by warm ocean currents.
2.This cool air descends, causing a high pressure area. 3. Cool, dry winds
move out toward the ocean.
Winds reverse ( low pressure is now found over the southern hemisphere.)
LANDOCEAN
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Winter MonsoonsAdvantages Disadvantages
• Allows rice to ripen and be harvested.
• Gives relief from the constant rain.
• Unpredictable - often comes too early or too late.
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Contrast: Spring & Summer
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POPULATION DENSITY:The average number of people
per square mile• Sparsely populated -- few people per square
mile. (Ex: Plateau of Tibet)
• Densely populated -- many people per square mile. (Ex: near the Ganges R.)
• 2000 census data:
U.S.A. = 64 people per sq. mile
INDIA = 819 people per sq. mile
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