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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

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…

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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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