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3) Explain the meridional circulation of the atmosphere and its importance in world climate.(250 words)

Topic-Salient features of world’s physical geography.

3) Explain the meridional circulation of the atmosphere and its importance in world climate.(250 words)

 

Why this question:

Question is based on the concept of Meridional circulation of the atmosphere and it significance in World climate.

Demand of the question:

This question seeks to examine the role of Meridional circulation of the atmosphere and it role in determining the aspects of World climate.

Directive word:

Explain – Clarify the topic by giving a detailed account as to how and why it occurred, or what is the  particular context. You must be defining key terms where ever appropriate, and substantiate with relevant associated facts.

Structure of the answer:

Introduction

Start with what is Tri-Cellular Meridional Circulation of atmosphere.

Body

Discuss the following points in detail:

  • The concept of Meridional circulation in detail. – There is cellular circulation of air at each meridian (longitude). Surface winds blow from high pressure areas to low pressure areas but in the upper atmosphere the general direction of air circulation is opposite to the direction of surface winds. Explain the three cells associated in detail with diagrams.
  • Discuss its significance – meridional circulation plays a vital role in  the transfer of energy and in maintaining the heat budget of the earth. The belt of doldrums or the inter-tropical convergence Zone (ITCZ) is the most important and uninterrupted belt of convergence on the surface of earth. The development of tropical cyclones, temperate cyclones, and anticyclones is also the result of meridional circulation. Etc.

Conclusion

Conclude with how distribution patterns of precipitation and climatic types are also largely controlled by the tricellular meridional circulation.