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Tropical_Meteorology_Monsoon-part_I-2010

Tropical_Meteorology_Monsoon-part_I-2010 - SEASONAL...

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SEASONAL VARIATIONS IN REGIONAL CIRCULATION SYSTEMS: THE MONSOONS
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The word “Monsoon” The word "monsoon" is derived from the Arabic word "mausim" which means season. Ancient traders sailing in the Indian Ocean and adjoining Arabian Sea used it to describe a system of alternating winds which blow persistently from the northeast during the northern winter and from the opposite direction, the southwest, during the northern summer. Thus, the term monsoon actually refers solely to a seasonal wind shift, and not to precipitation
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Outline Definition of Monsoon ü The Monsoon Makers ü Annual Monsoon Cycle ü Variability of the monsoons Regional Monsoon Systems ü The Indian Monsoon ü The East Asia Monsoon ü The Australian Monsoon / East Asia Winter Monsoon ü The African Monsoon ü The American Monsoon Summary
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Let’s examine first the Indian Monsoon
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DEFINITION Prevailing wind direction shifts by at least 120º betwen January and July Average frequency of prevailing directions in January and July exceeds 40%
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The Monsoon Makers 1) Seasonal Heating 2) Moisture Processes 3) The Earth’s Rotation
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The Monsoon Makers: 1) Seasonal Heating Seasonal contrasts in land surface temperatures produce atmospheric pressure changes.
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