Types of wind
Formation
Sea and Land breezes
These are small-scale local winds which are experienced at the coastal areas. These winds are a results of the different rate of heating and cooling of the land in reltaion to the sea.
In the day, the coastal land is heated up faster than the sea. As the heated air expands and rises, a low pressure area forms over the land. Since the water is cooler, a higher pressure area forms over the sea. A sea breeze starts blowing from the higher pressure area over the sea to the low pressure area over the land to replace the air that has risen. A sea breeze has a cooling effect at coastal areas.
At night, the coastal land loses heat faster than the sea. The denser coller air over the land sinks, forming a high pressure area. Since the water loses heat less rapidly, the relatively warm air rises and a lower pressure area forms over the sea. A land breeze blows from the higher pressure area over the land to the lower pressure area over the sea to replace the air that has risen.
Monsoons
Monsoons are large-scale seasonal winds that are characterized by a seasonal reveral of wind direction. They are caused by the extreme heating and cooling of huge land masses in reltaion to the seas. This results in differences in air pressure between the land masses and seas and the movement of large-scale winds from high pressure areas to low pressure areas.
Towards the end and beginning of the year, the northern hemisphere is having winter. The land masses in central asia and North-west India lose heat rapidly. The cold air contracts, becomes denser and sinks, creating an intense high pressure area. The southern hemisphere is having summer. The warm air expands, becomes lighter and rises, creating an intense low pressure area in Northern Australia.