Wind Currents

While travelling, most of us prefer to have a window seat.

We do this so that we can enjoy the breeze or wind on our face.

Breeze is nothing but a gentle wind that is flowing.

Even near the beaches, we can experience this cool gentle breeze or wind.

Winds run all over the world and they play a major role in controlling our climate

Global winds or wind currents are responsible for distributing global heat.

This distribution of heat directly affects continental climates.

Global winds are strong winds that always flow in a pattern because of the earth's rotation

To understand how these currents form, a knowledge of the impact of Earth's motion is necessary

Impact of the earth's motion on the formation of global wind current.

The earth rotates on an axis at

This creates a difference in temperature at various regions of the earth's surface as well as the ocean.

Due to this tilt, when earth revolves around the sun, solar radiation strikes the earth at varying intensities or densities. And the heat from the sun is not distributed uniformly.

Because of constant heating, the tropical region remains at high temperature and a low-pressure region.

These differences in temperatures and pressures form a pattern for climates and air circulation according to latitude, giving rise to wind currents.

The direction of wind currents is also affected by the tilted axis of the earth.

Wind currents are also generated due to uneven heating between land and ocean.

Compared to air or land, water absorbs less heat

That means it needs to gain more energy than a comparable amount of air or land to increase its temperature.

Water can also retain heat energy for a longer period of time compared to land or air.

In daytime, land remains warmer than water bodies, therefore, the air over land is warmer than that over the water surface.

This causes warm air over the land to rise up because of its low density, and cold air from water to take its place.

Thus there is a flow of cold air from water bodies towards the lands. This phenomenon is also known as the Sea Breeze.

Similarly, at night, the land quickly loses its heat while water retains its warmth.

This means the air over the water is warmer, therefore less dense and thus begins to rise.

And the cold and dense air from the land begins to move to the water surface to replace the warmer rising air

Therefore, here the cold air blows from land to water surface. This phenomenon is known as Land Breeze

Both land breeze and sea breeze are different wind currents generated due to different heating of water surface and land surface.

Revision

Global wind currents are responsible for distributing global heat. This distribution of heat directly affects continental climates.

Global winds are strong winds that always flow in a pattern because of the earth's rotation.

The tilted position of earth's axis affects the direction of wind currents.

Wind currents can also form due to different heating abilities of water and land.

Compared to air or land, water is a slow conductor of heat and it can also retain heat energy for a longer period of time.

Blowing of cold winds or breeze from land to sea during the night, is known as land breeze

Blowing of cold winds or breeze from ocean or other water surface to land in the daytime, is known as sea breeze

The End