What causes convection currents in air?
Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth.
What causes two distinct pressure zones between the equator?
The Coriolis force, cause distinct pressure zones between the equator and the poles due to the spinning of the earth on its axis. This force directs the winds on the right side in the northern hemisphere and directs them in the left side in the southern hemisphere.
What does the Coriolis effect do to the winds in the northern hemisphere?
What is the Coriolis effect? The Earth’s rotation means that we experience an apparent force known as the Coriolis force. This deflects the direction of the wind to the right in the northern hemisphere and to the left in the southern hemisphere.
What kind of air rises faster?
The cold air undercuts the warmer air in front of it, forcing the warm air to rise above it more vigorously than at a warm front. As the warm air rises much faster it may cool more rapidly and may form large cumulonimbus clouds.
Does air rise or sink at 30 n s?
The air sink at 30 degree latitude as it is very cool enough at that time. Cooler air will have a higher density which will make the air to sink to the Earth surface create a high pressure area.
Why does air sink at 30 degrees north and south?
At the equator, the ground is intensely heated by the sun. This causes the air to rise which creates a low-pressure zone on the Earth’s surface. When it reaches about 30° north and south, the air cools and sinks towards the ground forming the subtropical high-pressure zone.
Does air rise or sink at 60 degrees latitude?
60 degrees N & S Latitudes: another area of rising air, not as strong as ITCZ. Prevailing Westerlies (in N Hemisphere): between ~60 degrees N&S latitudes and ~30 degrees N&S latitudes air blows towards the poles. 90 degrees N & S Latitudes: air sinks over the poles and moves equatorward.
Why is there low pressure at the equator?
Equatorial regions is hotter and the air above expands, becomes less dense and rises. This produces a low pressure belt at this latitude.
Why does air subside at latitude 30 degrees in both hemispheres?
Air usually subsides at 30 degrees because at that latitude it is cool enough to allow it to sink. Meanwhile surface air would move towards the equator to take the place of the rising hot air there, forming a giant Hadley cell.
Why does air rise at 60 degree latitude?
With the converging air masses at the surface, the low surface pressure at 60° latitude causes air to rise and form clouds. Thus the polar front is the boundary between warm tropical air masses and the colder polar air moving from the north.
What happens to the air at 30 degrees latitude?
At about 30 degrees latitude north and south, the cooled air descends back to the surface, pushing the air below it toward the equator, since air flows always move toward areas of low pressure.
What climate is typically find at 30 N and 30 S?
At 30 degrees latitude, the dry air creates deserts. Major deserts of the world, including the Sahara, Arabian, Gobi, Great Victoria, Kalahari, Atacama, and the Chihuahuan/Sonoran deserts occur around 30° N or 30° S.
What is the climate like at 90 degrees latitude?
The geographic South Pole is located at 90 degrees south latitude. The geographic South Pole is located at 90 degrees south latitude. The station accommodates up to 250 people during the austral summer. Temperatures there average minus 60 degrees Fahrenheit year-round.
Why does the warm rising air from the equator eventually fall at 30 N and S?
The air that rises at the solar equator descends near 30 degrees N or S. Condensation has already removed much of its water as precipitation in the tropics, and its capaciaty to evaporate and hold water increases further as it sinks and warms.
Why does air rise at the equator?
This pattern, called atmospheric circulation, is caused because the Sun heats the Earth more at the equator than at the poles. It’s also affected by the spin of the Earth. In the tropics, near the equator, warm air rises. When the air cools, it drops back to the ground, flows back towards the Equator, and warm again.
Where is 30 degrees north of the equator?
The 30th parallel north is a circle of latitude that is 30 degrees north of the Earth’s equatorial plane. It stands one-third of the way between the equator and the North Pole and crosses Africa, Asia, the Pacific Ocean, North America and the Atlantic Ocean.