Indian Monsoon 2

Outline the causes of formation Thar in Rajasthan and also the reasons for least rainfall in Gujarat and Rajasthan.

-Aravalli parallel to wind direction

-No vertical convection cells.

-Presence of sub tropical jets towards the end of winter.

Despite close proximity to Rajasthan why are Haryana and Punjab not deserts?

-Himalayan Embrace

-More average annual rainfall

-Abundant rivers.

Theories of Indian Monsoon

1.Haileys theory

2.Air mass theory

3.Dynamic theory

Haileys theory

-Temperature variation between land and oceans.

-Differential heating-Direct sunrays-North of equator-during summer. And vice versa during winter.

-Limitations-Could not explain the delay of monsoon.

-Could not explain periods of torrential rainfall.

Air mass theory.

-Temperature and humidity differences between land and sea, leading to the development of specific air masses.

-Considers the presence of frontal boundaries.

-Occurs in local scale

Define ITCZ.

ITCZ can be defined as a belt of low pressure in and around equator where trade winds of both the hemisphere s converge.

Dynamic theory.

Seasonal shifting of ITCZ.

Differential heating of land and water.

Airmass theory focuses on the characteristics of airmass whereas dynamic theory focuses on large scale atmospheric patterns.