Earth Science for Kids: Weather - Wind
What is the relationship between temperature and pressure? to world patterns of pressure, winds, and precipitation. .. That phrase will help students to. pressure patterns drive wind patterns which in turn drive oceanic circulation patterns. atmospheric & oceanic circulation: major mechanisms for. To get wind there needs to be a pressure gradient, so one side will have a higher pressure than the other. Wind will then start blowing from the.
Cool air produces high air pressure and warm air produces low air pressure. Warm air wants to rise. When warm air rises, cool air will move in and replace the warm air, causing wind. Another factor that affects the wind is the spinning of the Earth. This is called the Coriolis effect. How is wind measured? Meteorologists use two main measurements to describe wind: Wind Direction - Wind direction is described by using the direction that the wind came from.
How does atmospheric pressure affect wind direction?
For example, a southerly wind would blow from the south to the north. Wind direction is measured a number of ways including weather vanes, flags, and windsocks.
Wind Speed - The speed of wind is measured in miles per hour or kilometers per hour. Scientists typically use a tool called an anemometer to measure the speed of the wind. Global Winds The Earth has consistent wind patterns when looked at from a global scale. Global winds are created by both the spin of the Earth Coriolis effect and the differences in temperature between the equator and the polar areas.
These winds are often grouped together as trade winds, easterlies, and westerlies. Trade winds - Trade winds occur near the equator and flow from either the north or south towards the equator. They curve towards the west due to the spin of the Earth. Prevailing westerlies - In the middle latitudes of the Earth, between 35 and 65 degrees latitude, are the prevailing westerly winds.
These winds blow from the west to the east and also towards the poles. Polar easterlies - These winds blow close to the north and south poles.
5. Atmospheric Pressure & Wind
They blow away from the poles and curve east to west. Click on map to see larger view Local Winds Some winds are generated by changes in air pressure and temperatures locally. These winds may change direction as conditions change throughout the day. One example of a local wind is the wind that blows on the ocean coast. During the day, the land heats up faster than the ocean.
What is the relationship between air pressure and wind?
This causes a "sea breeze" that blows from the ocean into the land. Just like an acrobat with two people stacked on his shoulders would want to move to where there wasn't so much pressure on him, air moves from areas where the pressure is higher to where it is lower. What causes Air Pressure? Air pressure depends on the density of the air, or how close together its molecules are.
How Does Pressure Affect Wind? | Sciencing
You know that a hard rubber ball is more dense than a Styrofoam ball and that ice cream is more dense than whipped cream. Air lower in the atmosphere is more dense than air above, so air pressure down low is greater than air pressure higher up. Remember those acrobats; there's a lot more pressure on the one on bottom than on the one on top. Temperature also makes changes in air pressure.
In cold air, the molecules are more closely packed together than in warm air, so cold air is more dense than warm air. Rising and Sinking Air Since warm air is less dense and creates less air pressure, it will rise; cold air is denser and creates greater air pressure, and so it will sink. When warm air rises, cooler air will often move in to replace it, so wind often moves from areas where it's colder to areas where it's warmer. The greater the difference between the high and low pressure or the shorter the distance between the high and low pressure areas, the faster the wind will blow.
Wind also blows faster if there's nothing in its way, so winds are usually stronger over oceans or flat ground.
Meteorologists can forecast the speed and direction of wind by measuring air pressure with a barometer. Wind Direction Although wind blows from areas of high pressure to areas of low pressure, it doesn't blow in a straight line.
That's because the earth is rotating.