Why do winds blow?
Wind is observed as air that is moving. The weather change every day is because of the winds that are blowing. The pressure differences are the reason for the production of wind. It is known that an ocean of air covers the entire earth on us. The normal atmospheric pressure in the Colorado when we observe at one side of the door was observed to be about 15 tons. But there was also an equal force that was observed on the other side too. This makes the total force or net force as zero. If the atmospheric pressure is more at one side than the other then there will be some force acting on the objects.
The pressure in the atmosphere is also not constant as the earth gets heated unevenly due to the sun’s heat. This is because at the north and south poles, the solar radiation falls at an angle which is greater than that falls at the equator region. So, the solar radiation intensity is more at the equator than at the poles. At high altitudes the sun radiation will reach earth comparatively lesser than that is received at the equator. Apart from this, the snow and ice that are present at the poles will reflect the radiation into the space while at equator the intense radiation from the sun is absorbed well by the vegetation. Hence the oceans in the tropical region are warmer than at the high altitudes.
This means there is loss of solar radiation at higher latitudes and gain at the tropical regions. This variation prompts the movement of air from the warmer regions to the cooler north and South Pole regions. This movement of air will generate oceanic currents to move water towards the direction to which wind is moving.
The difference in solar radiation heating the surface will create warm and cool air in the atmosphere which creates in turn low and high pressures in the atmosphere. The difference in the pressure at one place to the other will make the wind to blow from the region of low pressure to the region of high pressure. The rotation of earth can also makes pressure differences to be observed in the small scale.