Polar Vortex

Why in news?

• Polar vortex to dip into New York late this week, bring temperatures near zero.

About Polar Vortex:

• The polar vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles. It was also known as the Polar Pig.
• According to scientists, the extremely cold weather that Asia is witnessing is largely the result of what is called a Polar Vortex. The term refers to an expanse of cold air that generally circles the Arctic but occasionally shifts south from the North Pole.
• The term "vortex" refers to the counterclockwise flow of air that helps keep the colder air near the Poles. It always exists near the poles but weakens in summer and strengthens in winter.
• Although there is a lack of consensus, it is believed that with a warming planet, shifts in the polar vortex are likely to become more frequent and pronounced.

PRACTICE QUESTION:

Consider the following statements regarding Polar Vortex:

1. It is observed in the northern hemisphere only

2. It weakens in summer and strengthens in winter

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

Answer