Tropical Cyclones

Tropical Cyclones are LOW PRESSURE ZONES or depressions mainly occurring during transition of season from summer to winter like in the month of September, October & November. They are heat engines and there major source of energy is LATENT HEAT.

SOME FACTS:

  • They are mainly formed in between 5 to 30 degree N&S latitudes.
  • They are absent in 0-5 degree N&S latitudes because of absence of Coriolis Force.
  • Sometimes they move from tropical to extra- tropical region.
  • They go Anti-Clockwise.
  • They are always destructive.
  • They increase water level in river.
  • Eye of the Cyclone is cool and calm.

CONDITIONS REQUIRED FOR THERE FORMATION:

  • Minimum Temperature of sea water should be 27 degree Celsius.(Water specific heat is high so they are formed in transition season)
  • Water body should be shallow & small, which is why Bay of Bengal has more cyclones than Arabian Sea.
  • Water should be sediment free.
  • High Coriolis force and pre-existing turbulence in atmosphere.

DIFFERENCE BETWEEN TROPICAL AND TEMPERATE CYCLONES:

  • Tropical Cyclones die when they approach land as evaporation is source of latent heat. This is not the case with Temperate Cyclones.
  • They do not have definite path as they move with local winds or sometimes with easterlies. Temperate Cyclones have definitive path.
  • Wind speed of Tropical Cyclones is very high ranging from 80km/h to 160km/h. Temperate Cyclones have less speed as compared to tropical.
  • Tropical Cyclones are destructive in nature which is not true in case of temperate cyclones.

TROPICAL CYCLONE PRONE AREAS:

TROPICAL CYCLONES ARE CALLED WITH DIFFERENT NAMES IN DIFFERENT REGION:

  1. CARRIBEAN SEA                                     HURRICANE
  2. INDIAN OCEAN                                       CYCLONES
  3. AUSTRALIA                                              WILLI WILLI
  4. CHINA                                                       TYPHOON
  5. JAPAN                                                       TYPHOON

MORPHOLOGY OF TROPICAL CYCLONE:

WARMING UP OF SEAS DUE TO GLOBAL WARMING AND INCREASE IN COASTAL TEMPERATURE DUE TO INDUSTRIALISATION HAS INCREASED THE FREQUENCY AND STRENGTH OF TROPICAL CYCLONES IN RECENT YEARS.

Leave a Reply

Leave a Reply

Your email address will not be published. Required fields are marked *

Copyright @copy; 2019. Dhamma IAS. All Rights Reserved.