Monsoon Types + Fohn Winds *G11 Flashcards
Monsoon definition
Seasonal winds that blow in particular tropical regions
(Subtropics)
What are monsoon winds caused by
Migration of ITCZ
Explain how a monsoon during winter works *3
*cold air north of Himalayas become colder than surrounding seas
*winds blow cold air along pressure gradient (South East Asia)
causes dry pleasant weather (33C)
-air blows from land-
Explain how a monsoon works during summer *
*cold air north of Himalayas are warmer than surrounding seas
*moist winds from the seas blow over South east Asia
*caused heavy rains - usually June to September
-wind from sea-
North of Himalayas aka
Siberian plateau
Fohn wind definition
Warm, dry winds that descends from leeward side of mountain
Leeward side
Side where winds descend and warm up
Windward side
Side where winds rise and cool
Why is air from the windward side moist
Comes from moist sea
DALR
Dry Adiabatic Lapse Rate
Rate at which temperature of dry unsaturated air decreases with an increase in height
1*C per 100m
WALR
Wet Adiabatic Lapse Rate
Rate ate which temperature of saturated air starts to decrease
O,5*C per 100m
Where are fohn winds most common
Mountainous areas
Negative effects of fohn winds *3
*drought
*forest fires
*snow can melt - floods, avalanches
Lapse rate definition
When temperatures change in atmosphere with altitude
Or
Rate of cooling
Explain how fohn winds, form *6
*air from the sea approaches leeward side
*unsaturated air cools at DALR
*once condensation begins, rising air cools at WALR
*water vapour condensates into clouds - rain
*air decends on on leeward side and warms rapidly (little moisture)
*warm and dry wind is the result
