World Climate: Types, Regions, and Factors Influencing Climate
TOPIC CLASSIFICATION
Subject: Geography - Climatology
Sub-topic: World Climate Types - Classification, Factors, and Regional Distribution
Mains GS Paper-I: Salient features of world's physical geography; climate and weather; climatic regions.
EXAMINER REASONING
Climatic classification is a core physical geography topic. Prelims tests: the Koeppen classification letters (Af, Am, Aw, BSh, BWh, Csa, Csb, etc.), characteristic features of each climate type, and world map locations. Mains demands: (a) comparison of tropical vs. temperate climates, (b) factors affecting climate (latitude, altitude, distance from sea, ocean currents, pressure belts), (c) Koeppen's scheme in detail - why it suits vegetation, (d) climate change - how shifting climate zones affect agriculture and ecosystems. The Koeppen-Geiger classification is the most UPSC-relevant framework.
Core Concept
Factors Influencing World Climate:
| Factor | Mechanism | Example |
|---|---|---|
| Latitude | Angle of insolation determines temperature | Equator → hot; Poles → cold |
| Altitude | Lapse rate - temperature drops ~6.5°C/km | Himalayas → cold despite low latitude |
| Continentality | Distance from sea → greater temp range | Central Siberia (extreme) vs. UK (moderate) |
| Ocean currents | Warm currents warm coasts; cold currents cool | Gulf Stream... |
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