monsoon system

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 Monsoon system is secondary circulation of the atmospheric circulation, it can affect the climate of large areas including south china, India. To understand more about the impact of monsoon and its related potential natural hazards, we should first discuss how monsoon system forms.

  Monsoon climates can be characterized as those where seasonal climate changes result from seasonal changes in the wind regime. In particular, the major monsoon areas exhibit twice yearly reversals in the prevailing wind direction. Such differing wind regimes lead to changes in all elements of the climate. It can also be seen as a gigantic land and sea breezes situation.

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  The main cause of monsoon circulation is the thermally direct cell resulting from surface temperature differences. For example, in winter, the Siberian High accumulate sub-zero masses of air, while in summer, the extreme heat reduces the pressure to 950mb over NW India.

  The formation of monsoon is a result of the positions of the continents on the Northern hemisphere. During the northern summer, surface heating og the land masses is intense. A shallow surface low pressure centre forms over India and over central asia. The intertropical convergence zone or equatorial tough moves northwards allowing an inblowing ...

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