World climates

Geography

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Consider the following statements regarding the wind pressure belts.

1. The Equatorial low pressure belt is a zone of wind convergence often termed as Doldrums.

2. The sub-tropical high pressure belt is a region of descending air currents.

3. The temperate low pressure belts are zone of convergence with the cyclonic activities.

Which of the above statements is/are correct?

Only 1

2 and 3

1 and 3

1, 2 and 3

EXPLANATION:

Equatorial Low Pressure Belt or ‘Doldrums’ Lies between 10°N and 10°S latitudes. Width may vary between 5°N and 5°S and 20°N and 20°S.
This belt happens to be the zone of convergence of trade winds from two hemispheres from subtropical high pressure belts. This belt is also called the Doldrums because of the extremely calm air movements. The position of the belt varies with the apparent movement of the Sun.
Sub-Tropical High Pressure Belt or Horse Latitudes: The sub-tropical highs extend from near the tropics to about 35°N and S.
Sub-Polar Low Pressure Belt : Located between 45°N and S latitudes and the Arctic and the Antarctic circles (66.5° N and S latitudes).
Owning to low temperatures in these latitudes the sub polar low pressure belts are not very well pronounced year long. On long-term mean climatic maps the sub polar low-pressure belts of the northern hemisphere are grouped into two centers of atmospheric activity: the Iceland low and the Aleutian depression (Aleutian low).
Such belts in the southern hemisphere surround the periphery of Antarctica and are not as well differentiated.
Polar High Pressure Belt
The polar highs are small in area and extend around the poles. They lie around poles between 80 – 90° N and S latitudes.