Before moving to the types, we have to understand what is wind. The wind is a movement of air that has both direction and speed. Candidates can read other NCERT Geography notes to prepare for UPSC IAS Prelims and Mains exam..

It is made up of eddies and gusts and these can only be felt and will not be seen, unlike rain and snow. Wind makes the leaves fall from trees, sand moves, and trees wave, hair fly, etc. Since it cannot be seen, the direction of the wind is measured by some of the conventional instruments like weathercock or weather vane.

Types of Wind

There are several types of wind and are mentioned below:

1. Planetary Winds
2. Trade Winds
3. The Westerlies
4. Periodic Winds
5. Local Winds

1. Planetary Winds

The winds which are distributed throughout the lower atmosphere are known as Planetary winds. These winds blow throughout the year and are confined within particular latitudinal belts, mainly in northeast and southeast directions or from high-pressure polar regions to low-pressure regions.

2. Trade Winds

Trade winds are also known as tropical easterlies and in the Northern hemisphere, these winds blow from the right, while in the Southern hemisphere, they blow from the left. Due to the Coriolis effect and Ferrel’s law, they start blowing towards the equatorial low-pressure belt from the sub-tropical high-pressure areas. In the Southern hemisphere, they blow as southeastern trades and in the Northern hemisphere, they blow as northeastern trades.

3. The Westerlies

The prevailing winds which blow from the west to the east are known as Westerlies. These westerlies flow in the middle latitudes of the earth i.e. between 30 degrees and 60 degrees latitude. These winds are also known as anti-trades. These Westerlies originate from the areas which have high pressure in the horse latitudes and move towards the polar region and generally steer extratropical cyclones.

4. Periodic Winds

The winds which change their direction periodically as there is a change in the seasons are known as Periodic winds. Types of Periodic winds:

• Monsoon winds: Monsoon winds are created due to the temperature difference which is created by the Indian Ocean, the Bay of Bengal, the Arabian Sea, and the Himalayan wall forms the basis of monsoon in the Indian subcontinent.
• Land Breeze: The winds that flow from the land towards the sea are known as Land Breeze. These winds carry only dry or warm air. These winds flow often at night.
• Sea Breeze: The winds that blow towards land from the direction of a large water body (ocean or river) are known as Sea Breeze. Due to the differences in air pressure created by the differing heat capacities of dry land and water the Sea Breeze is developed.
• Mountain and valley breeze: Valley breeze is the hot air blowing up to the slopes of mountains from the valley. In contrast, the mountain breeze is the cold air flowing towards the valley from the mountains.

5. Local Wind

These winds blow only during particular periods of time, day, or year and in some small areas. For example, land and sea breeze. In the northern part of India Loo is the local winds that blow.

How is Wind Measured?

The wind has both speed and direction. To measure these parameters, two different devices are used namely Anemometer and Wind Vane.

1. Anemometers

This instrument is used for measuring the speed of the wind and this is a common weather station instrument. There are different types of anemometers which are known as Cup anemometer, windmill anemometer, hot wire anemometer, sonic anemometer, and laser Doppler anemometer.

2. Wind Vane

The Wind vanes are also known as weathercock. And these devices are used for determining the direction of the wind

What Causes Wind?

Uneven Heating on the earth is the main cause of the wind movement. The uneven heating of the Earth's surface is caused by the sun. This occurs because the Earth is a tilted sphere and the sun does not heat all its surfaces uniformly and because the sun's heat penetrates land and water at different rates.

The Uneven Heating takes place in two situations

1. Uneven heating between land and sea
2. Uneven heating between equator and pole

Uneven Heating Between Land and Sea

The land region gets heated faster as compared to seawater. The air above the land gets heated by conduction as the temperature of the land rises. The density of warm air is less than the surrounding environment due to which the warm air rises above by creating a vacuum in its place. The cooler air from the sea region rushes to fill the vacuum which creates a cool breeze in the coastal region. At night time the land cools off more quickly compared to the sea which creates a temperature difference between the temperature onshore and that of the offshore. Because of this temperature difference, a pressure drop is created again which establishes a land breeze.

Uneven Heating Between Equator and Pole

The equatorial and tropical regions (which are close to the equator) get the maximum heat from the sun. Hence the equator region gets hotter than the polar regions. The air surrounding or nearer to this region gets heated up and rises above to create a vacuum. Cooler air from the polar region rushes to fill the vacuum. The wind does not flow in the north to south direction because of the directional changes which are caused by the rotation of the earth.

Types of Local Winds Around the World

The local winds in different regions are known by different names across the world. In the below table, the list of names of local winds is mentioned.

FAQs

Question. What are winds?

Question. What are the different types of winds?

Question. What are the factors that influence the direction of winds?

Question. How do winds affect the climate and weather patterns?

Question. What is the significance of the monsoon winds in India?

MCQs

1. Which of the following winds blow from the high-pressure areas towards the equatorial low-pressure belt?

A) Westerlies

B) Polar Easterlies

C) Trade Winds

D) Monsoon Winds

2. Which of the following is a characteristic of monsoon winds?

A) They are permanent winds

B) They occur seasonally

C) They blow from land to sea

D) They blow from the poles towards the equator

3. Which wind is responsible for the cool breezes that blow from the sea to the land during the day?

A) Land breeze

B) Sea breeze

C) Föhn wind

D) Westerlies

4. Which of the following is influenced by the Coriolis effect?

A) Ocean tides

B) Wind direction

C) Solar radiation

D) Moon phases

5. Which of the following is NOT a type of wind?

A) Föhn winds

B) Polar Easterlies

C) Westerlies

D) Lunar winds

GS Mains Questions and Model Answers

Q1: Analyze the role of winds in shaping the climate and weather patterns of India.

Answer: Winds play a vital role in shaping the climate and weather patterns of India, especially the monsoon winds, which are central to the Indian climate system. The South-West Monsoon, which blows from the Indian Ocean, brings much-needed rainfall to the Indian subcontinent from June to September, making it the primary source of water for agriculture. The monsoon winds influence the temperature and humidity levels in the region and contribute significantly to the economic and agricultural success of India. In addition, the Trade Winds and Westerlies affect ocean currents, which regulate coastal temperatures and precipitation patterns. Local winds, such as the sea breezes, moderate coastal climates, while föhn winds in the Himalayan foothills cause dry and warm conditions. The impact of winds on rainfall patterns, temperature distribution, and weather systems such as cyclones and low-pressure systems underscores their importance in understanding India's weather and agricultural cycles.

Q2: Evaluate the impact of global wind systems on India’s climate and agriculture.

Answer: Global wind systems have a significant impact on India’s climate and agriculture. The primary winds affecting India are the Trade Winds, Westerlies, and Monsoon Winds, each playing a critical role in shaping the country’s climate. The Monsoon Winds bring seasonal rains, which are crucial for India’s agriculture, particularly for crops like rice and sugarcane. The Trade Winds influence the onset of the monsoon by transporting moisture from the Indian Ocean to the subcontinent. The Westerlies, in conjunction with western disturbances, bring rain and snowfall to the north-western and Himalayan regions, impacting winter crops and the water supply for the northern plains. Additionally, the Coriolis effect modifies the direction of winds, influencing the development of weather systems like cyclones in the Bay of Bengal and the Arabian Sea, which can have disastrous effects on coastal agriculture. Thus, the global wind systems significantly affect agriculture, water resources, and disaster management in India.

Q3: Discuss the importance of local winds such as the land and sea breezes in moderating the climate of coastal regions.

Answer: Local winds, such as land breezes and sea breezes, play an important role in moderating the climate of coastal regions. Sea breezes occur during the day when the land heats up faster than the sea, creating a low-pressure area over the land and causing cooler air from the sea to blow inland. This helps cool down coastal areas, making them more comfortable during the hot summer months. Conversely, land breezes occur at night when the land cools faster than the sea, creating a high-pressure area over the land and causing the air to move from the land to the sea. These local winds help regulate temperature and humidity, ensuring that coastal areas do not experience extreme temperatures. Additionally, they influence the weather patterns in coastal areas, including precipitation and the formation of clouds. The regular occurrence of local winds contributes to the moderation of climate and enhances the livability of coastal regions.

Previous Year Questions on Winds and Types of Winds

1. UPSC CSE 2021

Question: "Discuss the role of winds in the climate of India and their significance for agriculture."

Answer: This question focused on the role of winds in shaping India’s climate, particularly the impact of monsoon winds on agriculture and the economic significance of seasonal winds.

2. UPSC CSE 2020

Question: "Explain the types of winds in India and their impact on local weather patterns and agriculture."

Answer: This question asked for an explanation of the different types of winds in India, such as trade winds, monsoon winds, and local winds, and their impact on local weather patterns and agriculture.