PLANETARY WIND SYSTEMS

Heating of the earth by sun is not uniform-equatorial region- more heat Heat is transported from the equator to the poles –heat balance Coriolis force-deflection-easterly/westerly

Doldrums ITCZ Subtropical highs(STH) Northeast trade winds, southeast trade winds Midlatitude westerlies Polar highs(PH) Semipermanent polar front(PF) PRESSURE AND WIND SYSTEMS

Doldrums ITCZ

Subtropical highs Trade winds

Westerlies and Polar highs Semi permanent Polar fronts

Northeast/southeast trade winds in tropics Westerlies in the middle latitudes Easterlies in the polar regions GENERAL CIRCULATION

A high pressure area lies over Indian Ocean An intense low pressure area forms over the northwest parts of the Indian subcontinent Southeast trade wind cross the equator by the middle of May- deflected to the right First place of onset- south Kerala Life and economy of entire country SOUTHWEST MONSOON

South west monsoon currents

Southwest monsoon

Northern hemispheric winter –intense high pressure area – over Central Asia by December Low pressure area lies over the south Indian Ocean Starting as the northwest monsoon of China –turns round the anticyclone and moves southwards as the northeast monsoon of South Asia Crossing equator-currents deflects-reaches Australia as northwest monsoon

SOUTH WEST MONSOON

SOUTH WEST MONSOON IN INDIA