A monsoon is a seasonal shift in the direction of a region’s prevalent, or strongest, winds. Monsoons cause wet and dry seasons throughout much of the tropics. Monsoons are essentially seasonal winds that flip direction as the seasons change. As a result, they are also called periodic winds. Monsoons travel from the sea to the land in the summer and from the sea to the land in the winter, forming a double system of seasonal winds. When it comes to India, the country experiences southwest monsoon winds in the summer and northeast monsoons during the winters.

The Nature of Indian Monsoon

Systematic investigations of the sources of rainfall in the South Asian area help in the understand the Indian monsoon, its causes, and its characteristics. In particular, some of its most significant features, such as: 

• The onset of the monsoon season
• Tropical cyclones and other rain-bearing systems and the link between their frequency and the rainfall distribution are studied
• Break-in monsoon  

The Onset of the Monsoon

• On the basis of previous research, it was assumed that the differential heating of land and water during the summer months was the mechanism that caused the monsoon winds to migrate towards the Indian subcontinent
• It is during the months of April and May when the sun is shining straight over the Tropic of Cancer that the enormous landmass in northern India receives a tremendous amount of heat
• This results in establishing a strong low-pressure system across the northern and western parts of the subcontinent. The pressure in the Indian Ocean during the Indian monsoon in the south of the landmass is high because water heats up slowly, and a low-pressure cell in the south of the mainland draws southeast trade winds from the Equator to the northern hemisphere
• The southwest monsoon may be considered as a continuation of southeast trades that have been steered towards the Indian subcontinent after crossing the Equator
• These winds intersect the Equator between 40°E and 60°E longitudes, bringing rain and snow to the region
• The withdrawal of the prevailing western winds from its location over the north Indian plains and the southern Himalayas is a comparable occurrence to the shift in location of the ITCZ
• Towards 15°N latitude, the easterly jet stream begins to develop only after the western jet stream has retreated from the area. According to popular belief, the easterly jet stream is responsible for the onset of the Indian monsoon season
• The arrival of the Indian monsoon season: The southwest monsoon arrives over the Kerala coast on June 1st and proceeds quickly throughout the country, reaching Mumbai and Kolkata between June 10th and June 13th. Southwest monsoon rains inundate the whole subcontinent by the middle of July

Rain-bearing Systems and Rainfall Distribution

• In India, there are two rain-bearing systems
• The rains start in the Bay of Bengal and spread over the lowland of northern India
• The second factors include the Arabian Sea current of the southwest monsoon, which sends rain to India’s west coast
• Much of the rainfall around the Western Ghats is orographic, which means that the moist air is impeded and pushed to climb along the mountainous terrain
• Both of the following elements are associated with the intensity of rainfall along India’s west coast
• The weather conditions on the ocean’s surface
• Specifically, it is the location of the tropical jet current along the east coast of Africa
• Seasonal variations in the frequency of tropical depressions forming in the Bay of Bengal may be seen from one year to another
• Their courses across India are governed mainly by the location of the Intertropical Convergence Zone (ITCZ), which is often referred to as the monsoon trough
• In response to the oscillations in the axis of the monsoon trough, there are variances in the course and direction of these depressions, as well as variations in the intensity and volume of rainfall from year to year
• When it rains, it does so in bursts, and the rainfall distribution takes place in a decreasing pattern from west to east along the west coast and from the southeast to northwest across the North Indian Plain and the northern half of the Peninsula

Break in the Monsoon

• During the southwest monsoon season, if rain does not fall for one or more weeks following a few days of heavy rain, this is referred to as a break in the monsoon
• During the Indian monsoon, these kinds of dry periods are extremely prevalent
• A variety of different factors causes these pauses in various places
• If  rain-bearing winds are not particularly common along the storm channel or the ITCZ over this area, the rains in northern India are likely to fail
• The dry periods that occur along the west coast are related to days when the winds blow parallel to the shore

Conclusion

Conclusively, we have looked into the nature of Indian monsoon in great detail. We can hence conclude by stating that Monsoons are basically seasonal winds that reverse their direction according to the change in season. And the monsoons have historically been very important because these winds were used by traders and seafarers to travel from place to place.