Insolation, Heat Budget & Albedo Effect Explained | UPSC Prelims 2026 | Geography | Drishti IAS

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This session is explained by Mr. Devendra Yadav, Expert Faculty at Drishti IAS, who presents a clear and conceptual understanding of key geography topics for UPSC preparation. The lecture covers important concepts such as insolation (solar radiation), heat budget, albedo effect, temperature distribution, and temperature inversion. Insolation refers to the amount of solar energy received by the Earth, which varies based on latitude, angle of incidence, duration of day, distance between Earth and the Sun, and atmospheric conditions. The concept of heat budget explains the balance between incoming solar radiation and outgoing terrestrial radiation, which maintains the Earth’s average temperature. The video also explains the albedo effect, which is the ability of surfaces like ice, water, and land to reflect solar energy back into space. Additionally, it discusses the horizontal and vertical distribution of temperature, lapse rate, and temperature inversion, including surface inversion, frontal inversion, and mechanical inversion. These concepts are essential for understanding climate systems and are frequently asked in UPSC examinations, making this session highly valuable for aspirants.
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