Atmospheric Circulation & Weather Systems - 1 - UPSC Geography Free MCQ

Tropical cyclones are known as Cyclones in the Indian Ocean, Hurricanes in the Atlantic, Typhoons in the Western Pacific and South China Sea, and Willy-willies in the Western Australia.

An occluded front is formed during the process of cyclogenesis when a cold front overtakes a warm front. When this occurs, the warm air is separated (occluded) from the cyclone center at the Earth's surface.

• Subtropical highs are areas of high pressure located around 30° north and south of the equator.
• These regions are characterized by descending air, which leads to dry and stable weather conditions.
• They contribute to the formation of deserts, as the air is typically warm and lacks moisture.
• Common examples include the Bermuda High in the North Atlantic and the Azores High.

It is generally balanced by a nearly equal but opposite gravitational force.

Isobars are lines connecting places having equal pressure.

Monsoons are seasonal winds which originate near the equatorial areas and from here they move towards the South–East Asia.

The standard atmosphere is a unit of pressure defined as 101325 Pascal (1.01325 bar), equivalent to 760 Millimeter of mercury (torr), 29.92 Inch of mercury and 14.696 Pounds per square inch.

A cyclone is a storm system characterized by a large low-pressure centre and numerous thunderstorms that produce strong winds and heavy rains. Cyclones feed on heat released when moist air rises, resulting in condensation of water vapour contained in the moist air.

The lines joining the places of equal atmospheric pressure are known as isobars.

A barometer is an instrument used to measure atmospheric pressure. It can measure the pressure exerted by the atmosphere by using water, air, or mercury.