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Geography – Indian Physical Environment

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Climatic Factors Influencing India
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El-Nino and Indian Monsoon
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Impact of Global Warming on India's Climate
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Monsoon Mechanism in India
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Regional Climatic Variations in India
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Role of Westerly Jet Streams
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Seasonal Rainfall Patterns in India
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Traditional Indian Seasons
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Learning Objectives

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Learning Objectives

  • Understand the monsoon mechanism in India, including the role of the ITCZ, monsoon trough, and the influence of the Himalayas.
  • Examine the climatic factors influencing India, such as latitude, altitude, distance from the sea, and relief, with a focus on the Himalayas and the Indian Ocean.
  • Analyze regional climatic variations within India, highlighting differences in temperature, precipitation, and seasonal patterns across various regions.
  • Discuss the impact of global warming on India's climate, including potential changes in temperature, sea levels, and agricultural patterns.
  • Evaluate the impact of the El-Nino phenomenon on the Indian monsoon, particularly its effects on rainfall patterns and agricultural cycles.
  • Explore the distribution and intensity of seasonal rainfall patterns in India, with an emphasis on the southwest monsoon and retreating monsoon seasons.
  • Describe the traditional division of the year into six seasons in India and the corresponding weather patterns and agricultural activities.
  • Investigate the role of westerly jet streams in influencing India's winter climate, especially in steering cyclonic depressions that affect the northwest region.

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Revision Notes & Summary

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Chapter Notes

Monsoon Mechanism in India

  • Onset and Variability: The Indian monsoon is characterized by a seasonal reversal in wind direction. The southwest monsoon sets in over the Kerala coast by June 1st, reaching Mumbai and Kolkata between June 10th and 13th, and by mid-July, it engulfs the entire subcontinent.
  • Role of ITCZ: The Inter Tropical Convergence Zone (ITCZ) shifts northward, influencing the monsoon trough and creating a thermal low over north and northwest India.
  • Influence of the Himalayas: The Himalayas act as a barrier, trapping monsoon winds and forcing them to shed moisture over the subcontinent.

Climatic Factors Influencing India

  • Latitude: The Tropic of Cancer divides India into tropical and temperate zones, affecting temperature ranges.
  • Altitude: Higher altitudes like the Himalayas are cooler, affecting regional climates.
  • Distance from the Sea: Coastal areas experience equable climates, while interior regions have more extreme temperatures.
  • Relief: The Western Ghats and Himalayas influence wind patterns and precipitation.

Regional Climatic Variations in India

  • Temperature Variations: Western Rajasthan can reach 55°C in summer, while Leh can drop to -45°C in winter.
  • Precipitation Variations: Cherrapunji receives over 1,080 cm of rainfall annually, while Jaisalmer receives less than 9 cm.

Impact of Global Warming on India's Climate

  • Temperature Rise: Global temperatures are projected to rise by 2°C by 2100, affecting sea levels and climate patterns.
  • Agricultural Impact: Changes in temperature and precipitation patterns could shift agricultural zones and affect crop yields.

El-Nino and Indian Monsoon

  • Phenomenon: El-Nino involves warm currents off the coast of Peru, affecting global weather patterns.
  • Impact on Monsoon: El-Nino can delay the onset of the southwest monsoon in India, affecting rainfall distribution.

Seasonal Rainfall Patterns in India

  • Southwest Monsoon: Most parts of India receive rainfall from June to September, with variations in intensity and distribution.
  • Retreating Monsoon: October and November see the retreat of the monsoon, with rainfall in the eastern Peninsula.

Traditional Indian Seasons

  • Six Seasons: India traditionally recognizes six seasons: Vasanta, Grishma, Varsha, Sharada, Hemanta, and Shishira.
  • Weather Patterns: Each season has distinct weather patterns and agricultural activities.

Role of Westerly Jet Streams

  • Winter Climate Influence: Westerly jet streams influence winter climate by steering cyclonic depressions that bring rainfall to northwestern India.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

Vasanta

B.

Grishma

C.

Varsha

D.

Sharada
Correct Answer: A

Solution:

The traditional Indian season of Vasanta corresponds with the months of Chaitra and Vaisakha in the Indian calendar, which align with March and April in the Gregorian calendar.

Chapter Concept:

Traditional Indian Seasons

A.

They cause excessive rainfall, leading to waterlogging and crop damage.

B.

They bring dry winds that increase the risk of drought conditions.

C.

They contribute to light rainfall, which is crucial for the growth of rabi crops.

D.

They have no significant impact on the agricultural cycle in this region.
Correct Answer: C

Solution:

The Westerly Jet Streams contribute to light rainfall in northwestern India during winter, which is crucial for the growth of rabi crops, such as wheat and barley.

Chapter Concept:

Role of Westerly Jet Streams

A.

Decrease in the prevalence of malaria

B.

Expansion of disease vectors to higher altitudes

C.

Reduction in mosquito population

D.

Stability in the geographic range of vectors
Correct Answer: B

Solution:

With rising temperatures due to global warming, insect-borne diseases like malaria may spread to higher altitudes as the climate becomes more suitable for disease vectors.

Chapter Concept:

Impact of Global Warming on India's Climate

A.

El-Nino effect

B.

Regional variations in monsoon climate

C.

Proximity to the equator

D.

Presence of the Himalayas
Correct Answer: B

Solution:

Regional variations in monsoon climate lead to variability of rainfall in India.

Chapter Concept:

Seasonal Rainfall Patterns in India

A.

They bring warm air from the equator.

B.

They steer cyclonic depressions affecting northwest India.

C.

They cause heavy rainfall in the southern peninsula.

D.

They lead to the onset of the southwest monsoon.
Correct Answer: B

Solution:

The westerly jet streams are responsible for steering cyclonic depressions that affect the northwest region of India during winter.

Chapter Concept:

Role of Westerly Jet Streams

A.

The formation of cyclonic depressions over the Andaman Sea.

B.

The onset of 'Loo' winds in the northern plains.

C.

The increase in snowfall in the Western Ghats.

D.

The rise of temperatures due to the absence of cloud cover.
Correct Answer: A

Solution:

During the retreating monsoon season, cyclonic depressions often form over the Andaman Sea and move towards the eastern coast of the southern Peninsula, bringing rainfall to the region.

Chapter Concept:

Seasonal Rainfall Patterns in India

A.

It causes the reversal of monsoon winds from northeast to southwest.

B.

It creates a high-pressure zone over the Indian subcontinent.

C.

It shifts northward, creating a low-pressure area that attracts the southwest monsoon winds.

D.

It remains stationary, causing consistent rainfall throughout the year.
Correct Answer: C

Solution:

During the summer, the ITCZ shifts northward, creating a low-pressure area over the Indian subcontinent that attracts the southwest monsoon winds, leading to the monsoon season.

Chapter Concept:

Monsoon Mechanism in India

A.

It is located in the rainshadow area of the Western Ghats.

B.

It is parallel to the Bay of Bengal branch of the monsoon.

C.

It receives moisture from the Arabian Sea branch.

D.

It is shielded by the Eastern Ghats.
Correct Answer: B

Solution:

The Tamil Nadu coast remains dry because it is situated parallel to the Bay of Bengal branch of the southwest monsoon.

Chapter Concept:

Monsoon Mechanism in India

A.

Decrease in monsoon variability

B.

Increase in frequency of droughts and floods

C.

Stabilization of temperature extremes

D.

Reduction in soil erosion
Correct Answer: B

Solution:

Global warming leads to increased variability in rainfall patterns, causing more frequent droughts and floods, which directly impact agriculture.

Chapter Concept:

Impact of Global Warming on India's Climate

A.

Southwest monsoon winds

B.

Northeast monsoon winds

C.

Cyclonic depressions

D.

Western disturbances
Correct Answer: B

Solution:

The Tamil Nadu coast receives rainfall during the retreating monsoon season primarily due to the northeast monsoon winds, which pick up moisture from the Bay of Bengal.

Chapter Concept:

Regional Climatic Variations in India

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True or False

Correct Answer: True

Solution:

The westerly jet streams play a crucial role in steering cyclonic depressions originating from the Mediterranean Sea, which bring winter rainfall to northwestern India.

Chapter Concept :

Role of Westerly Jet Streams

Correct Answer: False

Solution:

During the Indian monsoon season, the ITCZ shifts northwards to around 20° N-25° N latitudes.

Chapter Concept :

Monsoon Mechanism in India

Correct Answer: True

Solution:

The text states that due to global warming, the sea level is projected to rise by 48 cm by the end of the 21st century.

Chapter Concept :

Impact of Global Warming on India's Climate

Correct Answer: True

Solution:

The traditional Indian system divides the year into six seasons, each lasting approximately two months.

Chapter Concept :

Traditional Indian Seasons

Correct Answer: True

Solution:

The Himalayas act as a barrier, trapping monsoon winds and forcing them to release moisture over India.

Chapter Concept :

Monsoon Mechanism in India

Correct Answer: True

Solution:

The Himalayas provide an invincible shield that protects the Indian subcontinent from cold and chilly winds originating near the Arctic circle.

Chapter Concept :

Climatic Factors Influencing India

Correct Answer: True

Solution:

In July, the ITCZ is located around 20° N-25° N latitudes, which encourages the development of thermal low over north and northwest India, influencing the southwest monsoon.

Chapter Concept :

Regional Climatic Variations in India

Correct Answer: False

Solution:

The westerly jet streams are associated with bringing cold weather and cyclonic depressions to the northern plains of India, which often result in lower temperatures rather than an increase.

Chapter Concept :

Role of Westerly Jet Streams

Correct Answer: False

Solution:

The Tamil Nadu coast remains dry during the southwest monsoon season because it lies in the rainshadow area of the Arabian Sea branch and is parallel to the Bay of Bengal branch.

Chapter Concept :

Monsoon Mechanism in India

Correct Answer: False

Solution:

The traditional Indian division of the year into six two-monthly seasons is based on practical experience and age-old perception of weather phenomena and does not perfectly match the meteorological seasons recognized by the Indian Meteorological Department.

Chapter Concept :

Traditional Indian Seasons

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