What is the importance of upper atmospheric circulation in the day-to-day weather patterns we experience?????

Question

....we experience on the ground???????



i hav an essay due TOMORROW!!! im screwd unless someone helps me out, please please help! ders just so much info out there n i cant seem to find a good place to start!! i would REALLY appreciate any help! thanx so much.

Answer 1

It is hard to know where to start in this answer and I don't know what level of education you are so I don't know how technical to be or not be but I'll try. To begin with, warm air is less dense than cold air so if you have a chunk of warm air and the same chunk of cold air, the top of the warm chunk will be higher. Upper circulation is usually observed at a place called the 500mb height. The surface is usually close to 1000mb, that is the air pressure either in millibars or in inches of mercurey which would be around 30.00 inches of mercury. Anyways, the altitude at which the 500mb level appears is where will will focus. This usually occurs near 5,500 meters above sea level. The equator is generally warm air and the poles are cold air obviously so a chunk of air at the equator is going to be taller than at the poles. Along with this height difference, warm air is associated with high pressure and cold air is low pressure. This difference in height and pressure accumulates as you rise to the 500mb height and where the difference is greatest, you get the jet stream. Wind travels from high pressure to low pressure so this would creat a flow from the equator to the poles. The rotation of the earth creates a turning effect in winds called the corolis force. In the northern hemisphere, the force turns wind to the right and in the southern half, it turns to the left. In the northern hemisphere, if the flow is moving from equator to the pole, the coriolis effect turns the jet stream to a west to east flow. The jet stream is the biggest upper air circulation and the biggest cause of ground weather. When you look from above the earth, down, the stream bends and creates hills and valleys. Air circulates counter clockwise in a valley (trough) and clockwise in a hill (ridge). These rotations are upper air lows and highs. As the stream turns around a low and heads towards a ridge, it has to slow down to change its rotation. It slows down by spreading out and this divergence creates space below it for air to rise. The rising air is created by the formation of a surface low, the air circulates around a low and towards it's center and at the center, it collides and has to rise. This is how the surface Lows form. The opposite is how highs form where air moving from a ridge to a trough creates speeding up that pushes air down to the surface and spreads out on the surface creating a surface high. Again wind moves from highs to lows so this creates surface winds. Lows on the surface move the air and the stronger they get, the more they can shift air masses which is how cold and warm fronts start. I know its a lot to take in and hard to understand but this is just a start of things that can be talked about in an essay so you can look up key terms and learn more and incorporate what you know from class. Hope i helped and didn't confuse you more.

Answer 2

Good question. Here is a short answer. The wind flow in the upper atmosphere provides a steering current for both extra-tropical and tropical storms. Also the advection of vorticity, a measure of circulation in the atmosphere, at 500 mb, around 18,000 feet, results in convergence of the air below that level and divergence of the air above that level. This pattern is enhanced on the east side of upper level troughs in the westerlies. It is in this very region of the atmosphere where waves are created along fronts due to this vorticity maximum near 500 mb. Good luck with your essay.

Answer 3

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