Monsoons

7,618 views

Published on

I Spell SSt inservice course KVGN

Published in: Education, Business, Technology
0 Comments
7 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
7,618
On SlideShare
0
From Embeds
0
Number of Embeds
8
Actions
Shares
0
Downloads
469
Comments
0
Likes
7
Embeds 0
No embeds

No notes for slide

Monsoons

  1. 1. MONSOONS K.SUGUNA.R PGT GEO
  2. 2. MONSOON • • • • MONSOON –SEASON SEASONAL WINDS-WINDS THAT BLOW FROM A PARTICULAR AREA TOWARDS A PARTICULAR REGION IN A PARTICULAR DIRECTION SOUTHWEST MONSOON – SEA LAND NORTHEAST MONSOON _ LAND SEA
  3. 3. INDIAN MONSOON • INDIA IS LOCATED IN THE TRADE WIND BELT • IT IS A DRY CONTINENTAL WIND BELT • BUT FOR THE PHENOMENON OF MONSOON INDIA WOULD HAVE BEEN A SEMI DESERT
  4. 4. SOUTHWEST MONSOON • • • • • DURING THE MONTH OF JUNE SUN IS ON THE TROPIC OF CANCER AND THE TEMPERATURE IS HIGH IN THE NORTHERN PART OF INDIA DUE TO VERY HIGH TEMPERATURE AIR PRESSURE IS VERY LOW THIS LOWPRESSURE ZONE ATTRACTS THE WIND FROM THE SURROUNDING INDIAN OCEAN SOUTH TRADE WINDS CROSS THE EQUATOR AND BLOW FROM SOUTHWEST DIRECTION AND SO THEY ARE CALLED SOUTHWEST MONSOON WINDS. AS THEY MOVE FROM A VAST OCEAN PART THEIR RELATIVE HUMIDITY IS 90% AND GIVE RAINFALL TO INDIA
  5. 5. MECHANISM OF MONSOON • DIFFERENTIAL HEATING AND COOLING OF LAND AND WATER • SHIFT IN THE POSITION OF ITCZ • HIGH PRESSURE OVER MADAGASCAR • INTENSIVE HEATING OF TIBETIAN PLATEAU • JET STREAMS
  6. 6. DIFFERENTIAL HEATING AND COOLING OF LAND AND WATER • LAND ABSORBS THE HEAT VERY FAST AND RELEASES THE HEAT VERY FAST • WATER ABSORBS THE HEAT VERY SLOW AND RELEASES THE HEAT VERY SLOW • SEA BREEZE AND LAND BREEZE
  7. 7. POSITION OF ITCZ • IN THE MONTH OF JUNE ITCZ IS LOCATED IN THE TROPIC OF CANCER REGION • INTENSIVE HEAT LEADES TO THE FORMATION OF INTENSIVE LOW PRESSURE ZONE • LOW PRESSURE TROUGH IS KNOWN AS MONSOON TROUGH
  8. 8. INTENSIVE HEATING OF TIBETIAN PLATEAU • AS A VAST LAND MASS,TIBETIAN PLATEAU GETS INTENSELY HEATED DURING SUMMER • IT RESULTS IN STRONG VERTICAL AIR CURRENTS • FORMATION OF LOWPRESSURE OVER THE PLATAU
  9. 9. HIGH PRESSURE OVER MADAGASCAR • • THE PRESENCE OF THE HIGH PRESSURE AREA ,EAST OF MADAGASCAR . THE INTENSITY AND POSITION OF THIS HIGH PRESSURE AREA AFFECTS THE INDIAN MONSOON
  10. 10. JET STREAMS • • • FAST MOVING WINDS IN A NARROW ZONE IN THE UPPER ATMOSPHERE WESTERLY JETSTREAM HELPS IN ARRIVAL OF MONSOON-CAUSE AND EFFECT RELATION BETWEEN WITHDRAWAL OF WESTERLY JET STREAM AND SHIFT OF ITCZ EASTERLY JETSTREAM –HELPS IN SUDDEN OUTBREAK OF MONSOON
  11. 11. SOUTHERN OSCILLATION • Southern Oscillation, refers to the seesaw relationship of atmospheric pressures between Tahiti, south pacific island and Darwin, Australia’ • INDIAN OCEAN PACIFIC OCEAN SUMMER WINTER
  12. 12. ELNINO CURRENT • • • WARM CURRENT ALONG THE PERUVIAN COAST ONCE IN TWO TO FIVE YEARS REPLACING PERUVIAN COLD CURRENT INCREASES TEMPERATURE OVER EAST PACIFIC COAST AND WEAKENS TRADE WINDS ELNINO
  13. 13. BREAK OF MONSOON • BREAK OF MONSOON-ONSET OF MONSOON • SUDDEN ARRIVAL OF MONSOON
  14. 14. BREAK IN MONSOON • • • 1. 2. BREAK IN MONSOON RAINFALL WET SPELLS ARE FOLLOWED DRY SPELLS REASONS WHENEVER WINDS BLOW PARALLEL TO THE COAST POSITION OF ITCZ- MOVES TOWARDS NORTH NO RAIN IN PLAINS MORE RAIN IN HIMALAYAS

×