Quiz based on the video:
What is a monsoon?
Where are they most often associated with?
What happens in the Summer monsoon?
Where depend on Summer Monsoons?
Why is agriculture dependent on these monsoons?
Where do winter monsoons start?
Why are they less powerful?
What are they associated with?
THE THREE CAUSES OF MONSOONS:
1. HEATING DIFFERENCES: The extreme differential heating/cooling of large land masses in relation to the sea this impacts pressure and winds
2. HIMALAYAS: The Himalayas interfering with atmospheric circulation peaks of up to 8,000m
3. ITCZ: The Northwards movement of the ITCZ in the Northern Hemisphere
( skip to 50seconds)
QUIZ:
What happens to the air over land in the summer?
What happens to the air over the sea?
Is this a low-pressure or high-pressure system?
Where do the winds blow from? Why?
When is the wet monsoon season?
So what happens in the winter?
What pressure is dominating now?
Where do winds blow from?
When is the dry monsoon?
What has happened with the monsoons recently??
SUMMER MONSOON: JUNE- SEPTEMBER ( WET)
- ITCZ moves northwards as the sun moves towards the Tropic of Cancer
- This increases the insolation over northern India which causes the air to rise in places like India, Pakistan and Central Asia.
- Highest Temperatures usually occur just before the rainy period.
- Tropical Maritime and Equatorial Maritime air is diverted north east by the Coriolis effect
- When the rainy period begins the clouds block the solar radiation which reduces the monthly temperatures
- Rainfall (orographic and convectional) increases when the air is forced over the Himalays and the Western Ghats. This releases latent heat and increases the instability causing more air to rise.
- E.G. Cherrapunji recieves 13,000mm of rain in 4 months
Revision Task: Make a diagram formed poster explaining each of these points in order
WINTER MONSOON: DECEMBER- MAY (DRY)
- The subtropical jet stream and the ITCZ move just south of the equator
- There is high pressure and low temps over land and low pressure and higher temps over sea
- Winds are very dry and get drier as they go over the Himalayas
- This usually results in clear skies and sunniness
- Bombay recieves less than 100mm of rain during these 8 months compared to 2,000mm in the summer monsoon
The Three Seasons:
- Rainy Season June- September the late arrival can be really serious for agriculture, espcially intense on the Western Ghats and the headland of the Bay of Bengal
- Cold, Dry Season October - January Low temps winter conditions
- Hot Dry Season Feb - May All over India, Especially the North, Convectional thunderstorms and tropical cyclones effect Bay of Bengal and other placess
