Monsoons A seasonally varying wind Created by a continental scale sea breeze Famously, the NE & SW...
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Transcript of Monsoons A seasonally varying wind Created by a continental scale sea breeze Famously, the NE & SW...
Monsoons
• A seasonally varying wind
• Created by a continental scale sea breeze
• Famously, the NE & SW Monsoons over the
Indian subcontinent
• Other monsoons exist (American monsoon)
• Seasonal monsoon winds change circulation
in the Indian Ocean (Somali Curent)
Sea Breezes
Sea Breezes
Monsoon Processes
Monsoon Processes
Summer Winter
SW Monsoon NE Monsoon
Monsoon Winds
SW Monsoon NE Monsoon
Monsoon Winds
SW Monsoon NE Monsoon
Position of the Low Level Jet
Features of Indian Monsoon
•Coastline borders largest land
mass on planet & near the tropics
•Himalayas focus winds & create
orographic rains
•Glacial storage of freshwater
occurs
•Persistent low level winds (Somali or Findlater Jet)
SW Monsoon
NE Monsoon
Indian Ocean Circulation
•Far more complicated than Atlantic
or Pacific
•Monsoon winds drive seasonal
changes in observed currents in
Arabian Sea
•Reversing currents include Somali,
NEC & NECC
•Somali current reaches > 3.5 m/s
•Intense open ocean upwelling
The American Monsoon
• Occurrence of July Thunderstorms
over NW Mexico & Arizona
• Driven by monsoon between
Pacific Ocean & the American
Desert
• Huge issue for flash floods
The American Monsoon
Monthly precipitation over SW U.S. & Mexico
The American Monsoon
July Convective Activity Index
The American Monsoon
The American Monsoon
• Occurrence of July Thunderstorms
over NW Mexico & Arizona
• Driven by monsoon between
Pacific Ocean & the American
Desert
• Huge issue for flash floods