Explain how and why the average surface pressure features shift from summer to winter.?
What will be the ideal response?
ANSWER: When we compare the January and July maps of sea level pressure, we can see several changes in the semipermanent pressure systems. The strong subpolar lows so well developed in January over the Northern Hemisphere are hardly discernible on the July map. The subtropical highs, however, remain dominant in both seasons. Because the Sun is overhead in the Northern Hemisphere in July and overhead in the Southern Hemisphere in January, the zone of maximum surface heating shifts seasonally. In response to this shift, the major pressure systems, wind belts, and ITCZ shift toward the north in July and toward the south in January.?
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