Briefly explain each of the following statements that relate to the global distr

Question

Briefly explain each of the following statements that relate to the global distribution of surface pressure:

A. The only true zonal distribution of pressure exists in the region of the subpolar low in the Southern Hemisphere

B. The subtropics highs are stronger in the North Atlantic in July than in Januarary

C.The subpolar lows in the Northern Hemisphere are the result of individual cyclonic storms that are more in common in the winter.

D. Astrong high-pressure cell develops in the winter over nothern Asia.

Explanation / Answer

(a) The southern hemisphere is a hemisphere of water and there is land masses progressive diminution in higher latitudes found. The true zonal distribution of pressure exists only in the sub-polar low region in the southern hemisphere where the ocean is continuous. There is a trough of low pressure in the surroundings of the equator which is to a certain extent zonal in character.

(b) The subtropical regions in either hemisphere are dominated by a number of discontinuous high pressure cells called the subtropical highs. These highs are definitely not of thermal origin; they are supposed to be induced by mechanical means,

(c) Pole-ward from the subtropical highs there is a decrease of pressure towards the sub-polar lows located in the vicinity of the Arctic and Antarctic Circles. In the northern hemisphere the sub-polar trough of low pressure consists of individual cells of low pressure over the oceans. Contrary to this, there is a continuous belt of low pressure at about the latitude of the Antarctic Circle. The sub-polar lows owe their origin to the dynamic rather than thermal causes,

(d) The polar areas in either hemisphere are dominated by anticyclones that are of thermal origin.

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