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Geography Optional 300+ Score Pack · Model answer

Explain air masses and associated weather dynamics. How do air masses influence the weather conditions of the Northern Hemisphere ?

  • UPSC 2024
  • Climatology

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An air mass is a large body of air — often over a million square kilometres — whose temperature, humidity and lapse rate are nearly uniform at any given level; the idea came from the Bergen School of Vilhelm Bjerknes, Jacob Bjerknes, Halvor Solberg and Tor Bergeron after 1918, and Bergeron's 1928 classification still underlies…

You are reading the opening of the model answer. The full answer is part of the Geography Optional 300+ Score Pack.

What the full answer covers

  • Weather Dynamics of Air Masses
  • Air-mass weather: stability set from below
  • Mechanical modification
  • Frontal weather: where unlike air masses meet
  • Air Masses and Northern Hemisphere Weather
  • North America — an open meridional corridor
  • …and 3 more sections, with a conclusion
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