Explain how climate change affects the water cycle. Illustrate with examples. Class 9

Explain how climate change affects the water cycle. Illustrate with examples. Class 9

Question 1.

Explain how climate change affects the water cycle. Illustrate with examples. Class 9

Answer:

The water cycle involves evaporation, transpiration, condensation, precipitation, infiltration and groundwater flow. It connects the cryosphere, hydrosphere, atmosphere, geosphere and biosphere together.

How climate change affects the water cycle:

(a) Increased Evaporation:

1. Rising global temperatures cause more evaporation from oceans, rivers and lakes.
2. A warmer atmosphere holds more moisture, leading to heavier and more intense rainfall in some areas.
3. Example: Intensified southwest monsoons in

India, bringing floods to some regions while leaving others in drought.

(b) Melting of Glaciers:

1. Higher temperatures accelerate the melting of Himalayan glaciers and polar ice.
2. This adds more water to rivers, temporarily increasing their flow.
3. In the long run, it raises sea levels, threatening coastal cities like Mumbai and Chennai.

(c) More Runoff and Less Infiltration:

1. Sudden bursts of intense rainfall cause more water to run off directly into rivers.
2. Less water infiltrates into the ground, reducing groundwater recharge.
3. This makes sustaining agriculture difficult, especially during dry months.

(d) Soil Erosion:

1. Excess runoff erodes soil, reducing its fertility and making it harder to grow crops.

(e) Droughts in some areas:

1. While some regions receive heavier rainfall, others experience prolonged droughts due to changed rainfall patterns.

Conclusion: Climate change disrupts the water cycle by making rainfall patterns more extreme and unpredictable, threatening agriculture, water supply and coastal cities. It shows how a change in one sphere affects all others.