Q. Consider the following statements with respect to the westerlies:
- During the mid-holocene thermal maxima, glaciers in the Trans Himalayas are moving forward because of these.
- They blow from north-west to south-east in the northern hemisphere and southwest to north-east in the southern hemisphere.
- The westerlies are best developed in tropical latitudes.
Which of the statements given above is/are correct?
Answer:
Only 1
Notes:
- The westerlies are the winds blowing from the sub-tropical high pressure belts towards the sub polar low pressure belts.
- They blow from southwest to north-east in the northern hemisphere and north-west to south-east in the southern hemisphere.
- The westerlies of the southern hemisphere are stronger and persistent due to the vast expanse of water, while those of the northern hemisphere are irregular because of uneven relief of vast land-masses.
- The westerlies are best developed between 40° and 65°S latitudes. These latitudes are often called Roaring Forties, Furious Fifties, and Shrieking Sixties – dreaded terms for sailors.
- The poleward boundary of the westerlies is highly fluctuating. There are many seasonal and short-term fluctuations. These winds produce wet spells and variability in weather.
- During the mid-holocene thermal maxima, glaciers in the Trans Himalayas are moving forward because of these.