Anticyclones are centres of high pressure.They are surrounded by closed isobars having decreasing pressure outward. The circulation is from central high pressure towards the periphery in such a way that air blows outwards in a clockwise direction in the Northern hemisphere and anticlockwise direction in the southern hemisphere.
Due to Coriolis force, blowing winds are deflected from their paths to the right in the Northern hemisphere and left in the Southern hemisphere, that’s how it gets circular with a flowing system. The difference of pressure between the centre and periphery of anticyclone ranges between 10 to 20 mb and sometimes higher.
Types of anticyclones
Cold anticyclones or thermal anticyclones: They are formed above the Polar Regions due to the sinking of air. Post subsidence of air outflows from the polar region in an easterly and southeasterly direction.
Warm anticyclones or dynamic anticyclones: They are formed above warm subtropical regions due to the sinking of air from the upper troposphere to the lower troposphere and consequent divergence of air.
Blocking anticyclones: These developed due to obstruction in the air circulation in the upper troposphere that develops over mid-latitudes and are called blocking because they obstruct the flow of temperate cyclones in mid-latitudes.BPCS Notes brings Prelims and Mains programs for BPCS Prelims and BPCS Mains Exam preparation. Various Programs initiated by BPCS Notes are as follows:-
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